CAMU BASIC HANDBOOK – ATFM USER MANUAL

ENHANCED ATFM OPERATOR’S MANUAL
ENHANCED ATFM OPERATOR’S MANUAL
CAMU provides air traffic flow management through airspace capacity
management within South Africa, built on leading edge technology, supporting
traffic growth by optimising capacities, upholding environmental and safety
concerns, with highly skilled, people through collaborative decision making
processes with the entire aviation community.
Version 2
Updated 1 Apr 2010
Published by Central Airspace Management Unit
Johannesburg, Rep of S. Africa
ATNS/CAMU/00/32
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Version
Date
Updates
Updated By
Approved By
1.0
1 Mar 2010
Initial release
Armando de Olim
Armando de Olim
2.0
1 Apr 2010
Appendix A (ver2.2) CAMU
Web User‘s Guide
Metron Aviation
Armando de Olim
Armando de Olim
ANNEX 2 Delay Codes –
Added Delay Code OE00
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Table of Contents
ENHANCED ATFM OPERATOR‘S MANUAL ................................................................................. 1
1.
INTRODUCTION .......................................................................................................................... 9
1.1.
Purpose.................................................................................................................................. 9
1.2.
Applicability .......................................................................................................................... 9
1.3.
Validity................................................................................................................................... 9
1.4.
Amendments ........................................................................................................................ 9
ESTABLISHMENT OF ATFM PROCEDURES ................................................................. 10
2.
2.1.
3.
The difference between Air Traffic Control (ATC) and ATFM .................................... 11
AIR TRAFFIC FLOW MANAGEMENT (ATFM) ..................................................................... 12
3.1.
Objectives ........................................................................................................................... 12
3.2.
Responsibility for ATFM Measures ................................................................................ 12
3.2.1.
3.3.
ATFM Phases .................................................................................................................... 12
3.3.1
Strategic Flow Management ..................................................................................... 12
3.3.2
Pre-Tactical Flow Management ............................................................................... 12
3.3.3
Tactical Flow Management ....................................................................................... 12
3.4.
Areas subjected to ATFM ................................................................................................ 13
3.5.
Traffic Management Initiatives (TMI).............................................................................. 13
3.6.
Information on ATFM Measures ..................................................................................... 13
3.6.1.
Bi-annual Airspace Operations Plan ...................................................................... 14
3.6.2.
The Daily Airspace Plan (DAP) ............................................................................... 14
3.6.3.
The ATFM Flow Advisory Message (FAM) ........................................................... 14
3.6.4.
Collaborative Decision Making (CDM) Teleconference (Telcon) ....................... 16
3.6.5.
CAMUWEB................................................................................................................. 17
3.7.
4.
ATS line of communication and decision making................................................. 12
Air Traffic Flow Management Position ........................................................................... 17
TRAFFIC MANAGEMENT INITIATIVE ................................................................................... 18
4.1.
Overview ............................................................................................................................. 18
4.1.1.
Exemption from a Traffic Management Initiative (TMI) ....................................... 18
4.1.2.
Compliance with traffic management initiatives ................................................... 18
4.1.3.
Compliance with a TMI ............................................................................................. 18
4.1.4.
NAS information ........................................................................................................ 18
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4.2.
4.2.1.
Miles-in-Trail (MIT) .................................................................................................... 19
4.2.2.
Minutes-in-Trail (MINIT) ........................................................................................... 19
4.2.3.
Airborne Holding ........................................................................................................ 19
4.2.4.
Sequencing Traffic Programs .................................................................................. 19
4.2.5.
Level Capping ............................................................................................................ 20
4.3.
6
ADVANCE AIR TRAFFIC MANAGEMENT INITIATIVES ........................................... 20
4.3.1.
Ground Delay Programs (GDP) .............................................................................. 20
4.3.2.
AIRSPACE FLOW PROGRAMS (AFP) ................................................................. 25
4.3.3.
GROUND STOPS (GS)............................................................................................ 28
4.3.4.
ADAPTIVE COMPRESSION (AC) ......................................................................... 28
4.3.5.
Rerouting Proposals (RRP) ..................................................................................... 29
4.4.
5
BASIC AIR TRAFFIC MANAGEMENT TECHNIQUES & TERMS ............................ 19
FLOW CONSTRAINED AREA (FCA) ............................................................................ 29
4.4.1
Definition of a FCA .................................................................................................... 29
4.4.2.
Information on FCAs ................................................................................................. 29
4.4.3.
Display of the FCA - graphically.............................................................................. 30
TACTICAL SLOT ALLOCATION PROCESS ........................................................................ 31
5.1.
Initial slot allocation process for IATA coordinated airports ........................................ 31
5.2.
Slot allocation process ..................................................................................................... 31
5.3.
Slot management for arrivals and departures .............................................................. 32
5.4.
Line of Flight Continuity .................................................................................................... 33
5.5.
Slot Precedence ................................................................................................................ 33
5.6.
The Exemptions................................................................................................................. 33
5.7.
Slot swapping..................................................................................................................... 33
5.8.
Allocation Stage................................................................................................................. 34
5.9.
Slot Compression Process .............................................................................................. 34
5.10
Slot Swapping Procedure ................................................................................................ 34
5.11.
Aerodrome Parameters ................................................................................................ 34
SLOT ALLOCATION PROCEDURES ................................................................................... 36
6.1.
Airport slots ........................................................................................................................ 36
6.2.
Departure Slots .................................................................................................................. 36
6.3.
Late Reception of Slot Messages ............................................................................... 37
6.4.
Slot Adherence .................................................................................................................. 37
6.4.1.
Aircraft Operators ...................................................................................................... 37
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6.4.2.
ATC ............................................................................................................................. 37
6.5.
Slot Revisions .................................................................................................................... 38
6.6.
ATFM Contingency ........................................................................................................... 38
6.7.
Flight Plans......................................................................................................................... 38
6.8.
Duplicate Flight Plans ....................................................................................................... 39
6.9.
EOBT Requirements......................................................................................................... 39
6.10.
Procedure for Modifying the EOBT of a Flight having received an ATFM Slot. .. 39
6.11.
CAMU Helpdesk ............................................................................................................ 41
Contact Details ...................................................................................................... 41
6.11.1.
ATFM Messages ........................................................................................................... 41
6.12.
6.12.1.
Slot Allocation Message (SAM) .......................................................................... 41
6.12.2.
Slot Revision Message (SRM) ............................................................................ 42
6.12.3.
Flight Suspense Message (FLS) ........................................................................ 42
6.12.4.
Slot Requirement Cancellation Message (SLC) ............................................... 43
6.12.5.
De-Suspension Message (DES) ......................................................................... 43
6.13.
ATFM Messages Fields .............................................................................................. 44
REROUTING PROCEDURES ................................................................................................ 46
7.
7.1.
Rerouting Proposal (RRP) Message .............................................................................. 46
EXEMPTIONS FROM ATFM SLOT ALLOCATION............................................................. 47
8.
8.1.
Flights that Qualify for Exemption from ATFM Slot Allocation ................................... 47
ANNEX 1. ATFM MESSAGES LISTS............................................................................................ 49
ANNEX 2. REGCAUSE - DELAY CODES .................................................................................... 51
ANNEX 3.
PRIMARY FIELD COMPOSITION OF TACTICAL ATFM MESSAGES
EXCHANGE ........................................................................................................................................ 52
ANNEX 4. ATFM RTF PHRASEOLOGY....................................................................................... 53
ANNEX 5. SUMMARY OF CAMU ATFM SYSTEM PARAMETERS ........................................ 54
ANNEX 6. ACRONYMS ................................................................................................................... 55
APPENDIX A. - CAMU WEB USER‘S GUIDE ............................................................................ 59
A-1.
Introduction.............................................................................................................................. 61
A-2.
Accessing the Reports........................................................................................................... 62
A-3.
Performance Report............................................................................................................... 64
Ground Stop Only........................................................................................................................... 66
Drill Down Capabilities................................................................................................................... 66
Accessing a Flight‘s History ...................................................................................................... 66
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Sorting .......................................................................................................................................... 66
Viewing in Text Format .................................................................................................................. 67
Usage ............................................................................................................................................... 67
Determining why there is over or under delivery ................................................................... 67
Determining whether a compression or revision is needed ................................................. 67
GDP Modelling ............................................................................................................................ 68
AFP Modelling............................................................................................................................. 68
Detecting Airborne Holding ....................................................................................................... 68
A-4.
Flight Status Report ............................................................................................................... 69
Sorting .............................................................................................................................................. 70
Accessing a Flight‘s History .......................................................................................................... 70
Viewing in Text Format .................................................................................................................. 70
Exclusions ....................................................................................................................................... 70
A-5.
Cancels That Flew Report .................................................................................................... 71
Sorting .............................................................................................................................................. 71
Accessing a Flight‘s History .......................................................................................................... 71
Viewing in Text Format .................................................................................................................. 71
Usage ............................................................................................................................................... 71
Exclusions ....................................................................................................................................... 72
A-6.
Compliance Reports .............................................................................................................. 73
FCA Arrival Compliance Report ............................................................................................... 74
Sorting .............................................................................................................................................. 74
Accessing a Flight‘s History .......................................................................................................... 74
Viewing in Text Format .................................................................................................................. 75
Compliance Remarks ................................................................................................................ 75
To update the Non-Compliance Reason ................................................................................ 76
Exclusions ....................................................................................................................................... 76
Usage ............................................................................................................................................... 76
How CAMU Web Measures Compliance................................................................................ 77
A-7.
CTOT Before POBT Report .................................................................................................. 78
Sorting .............................................................................................................................................. 78
Accessing a Flight‘s History .......................................................................................................... 78
Viewing in Text Format .................................................................................................................. 78
Exclusions ....................................................................................................................................... 78
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Pop-up Report......................................................................................................................... 79
A-8.
Sorting .............................................................................................................................................. 80
Accessing a Flight‘s History .......................................................................................................... 80
Viewing in Text Format .................................................................................................................. 80
Exclusions ....................................................................................................................................... 80
Usage ............................................................................................................................................... 80
Time Out Delay Report .......................................................................................................... 81
A-9.
Sorting .............................................................................................................................................. 81
Accessing a Flight‘s History .......................................................................................................... 82
Viewing in Text Format .................................................................................................................. 82
Exclusions ....................................................................................................................................... 82
Usage ............................................................................................................................................... 82
A-10.
Duplicate Flights Report .................................................................................................... 83
Sorting .............................................................................................................................................. 83
Accessing a Flight‘s History .......................................................................................................... 84
Viewing in Text Format .................................................................................................................. 84
Usage ............................................................................................................................................... 84
Exclusions ....................................................................................................................................... 84
A-11.
Unassigned Slots Report .................................................................................................. 85
Sorting .............................................................................................................................................. 85
Viewing in Text Format .................................................................................................................. 85
A-12.
Events Report ..................................................................................................................... 86
Sorting .............................................................................................................................................. 87
Viewing in Text Format .................................................................................................................. 87
A-13.
Querying the Element Flight List ...................................................................................... 88
Displaying Tower View of Flight List............................................................................................ 89
Sorting .............................................................................................................................................. 90
Suspending Updates ..................................................................................................................... 90
Displaying Rows ............................................................................................................................. 91
A-14.
Looking Up Flights ............................................................................................................. 92
A-15.
Copying, Saving, and Printing a CAMU Web Report ................................................... 95
Creating a Text Version of a Report ........................................................................................ 95
To Copy and Paste the text report ........................................................................................... 95
To Save the text report .............................................................................................................. 95
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To Print the text report ............................................................................................................... 96
A-16.
Delegating/Undelegating Control ..................................................................................... 97
A-17.
Substitution.......................................................................................................................... 98
Updating the Data .......................................................................................................................... 98
Displaying Rows ............................................................................................................................. 98
Suspending Flights......................................................................................................................... 98
Swapping Slots ............................................................................................................................... 99
Updating ELTOT and ELLDT ....................................................................................................... 99
Updating AC_REG ....................................................................................................................... 100
Appendix A: Questions and Answers ............................................................................................ 101
Why does the number of slots not equal the requested Program Rate? ......................... 101
Appendix B: CAMU Web Users Roles .......................................................................................... 102
User Role Options .................................................................................................................... 102
Aerodromes ............................................................................................................................... 102
Majors......................................................................................................................................... 102
Appendix C: Acronyms .................................................................................................................... 104
Appendix D: Warning and Error Messages .................................................................................. 106
Warnings........................................................................................................................................ 106
Packet Header Errors .................................................................................................................. 106
Message Validation Errors .......................................................................................................... 106
Simplified Substitution Errors ..................................................................................................... 111
Appendix E: Revision History ......................................................................................................... 114
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1.
1.1.
INTRODUCTION
Purpose
The Enhanced Air Traffic Flow Management (ATFM) Operator‘s Manual has been
prepared with the main object of providing an operational description of the Central
Airspace Management Unit (CAMU) Enhanced ATFM Procedures and of the related
actions, information and message/web exchange.
1.2.
Applicability
It is aimed at the aviation community who will be involved in the ATFM process
including but not limited to Aircraft Operators (AOs), Aerodrome Operators, Flow
Management Positions (FMPs), and ATS Units operating within the South African
National Airspace.
1.3.
Validity
Applicability of the document is from the 03 May 2010.
1.4.
Amendments
This document is usually updated once a year. Major changes are promulgated by
an Aeronautical Information Publication (AIP).
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2.
ESTABLISHMENT OF ATFM PROCEDURES
The responsibility for the management of air traffic flow and capacity management
within South African sovereign and delegated airspace resides with the Central
Airspace Management Unit (CAMU) which is established at the Johannesburg ATC
Centre. The unit's responsibility includes, apart from managing the functions of the
slot allocation program, the management of the flexible use of airspace (FUA),
facilitating military exercises and operations, special and unusual events and any
other activity which might require the use of airspace for a particular time period. The
unit is also responsible for the re-routing of traffic, affected by adverse weather and
temporary restricted or special use airspace in consultation with the aviation
community in a collaborative decision making (CDM) process. In addition they will
balance demand against capacity using the ATFM system after CDM with the
appropriate aviation community members.
Air traffic flow and capacity management is a vital part of air traffic management in
exploiting the full capacity of the air transport system without running the risk of
infringing upon safety caused by overload situations. In future the management of
ATC capacity will become equally important as managing the traffic flows.
From the 1 March 2010, the enhanced air traffic flow management (ATFM) service
will commence within South African sovereign and delegated airspace. The service
will be provided from the CAMU, which is supported by Flow Management Positions
(FMP) established in certain control centers.
The objectives of the enhanced ATFM services are to:
Reduce ground and en-route delays;
Maximise capacity and optimise the flow of air traffic;
Provide an informed choice between departure delay, re-routing and/or flight
level selection;
Alleviate unplanned in-flight rerouting;
Assist ATS Units in planning for and managing future workload in the light of
forecast increased traffic flows within South Africa;
Assessing the impact of FUAs and TSAs on the air traffic control system;
Provide improved solutions around predicted severe weather;
Balance the demand and capacity of ATC sectors;
Determine the necessity for an airspace/ground delay program and other
traffic management initiatives (TMIs) and enact on them; and;
Enabling aircraft operators to operate as close to their preferred trajectories.
The ATFM procedures in this handbook have been established using the following
documents as reference:
SA AIP S004/10, in addition to the general description above is in conformance with
the procedures set out in ICAO DOC 4444 - Air Traffic Management. They form t he
basis for operating procedures specific to the CAMU.
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Procedures specific to the CAMU that are in line with policy and strategy developed
and approved by the SACAA. These include Letters of Procedures (LOP) between
ATS Units and the CAMU and Service Agreements between the CAMU and AOs,
Aerodrome operators.
2.1.
The difference between Air Traffic Control (ATC) and ATFM
All air traffic controllers, including air traffic flow managers, strive to provide a safe,
orderly, and expeditious flow of traffic on essentially a first come first served basis.
The differences lie in the scope, time parameters, tools, equipment, and the
communication processes. The separation of air traffic is the responsibility of air
traffic controllers, utilizing the tools at their disposal. The normal communication
process is:
Controller
Air Traffic Flow Manager
Pilot
Aircraft Operator
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3.
3.1.
AIR TRAFFIC FLOW MANAGEMENT (ATFM)
Objectives
ATFM is a service with the objective to enhance the quality of service and the
performance of the ATM system, by balancing the demand against capacity, by
optimising the use of available resources and coordinating adequate responses.
3.2.
Responsibility for ATFM Measures
The CAMU, in co-operation with the Flow Management Positions (FMP), including
regional ACCs, is responsible for the execution of ATFM measures within the
Johannesburg, Cape Town and Johannesburg Oceanic FIRs.
3.2.1.
ATS line of communication and decision making
In general, the ATS Units‘ management/supervisory/FMP coordinates directly with
the CAMU. After appropriate CDM has been carried out, the CAMU has final
approval authority for all national air traffic management initiatives (TMIs).
3.3.
ATFM Phases
ATFM has 3 phases:
3.3.1
Strategic Flow Management takes place two days or more prior to the day of
operation and includes research, planning and coordination activities. This phase
consists of analysing the evolution of the forecast demand, historical data analysis
and the identification of potential new problems and in evaluating possible solutions.
3.3.2
Pre-Tactical Flow Management is applied during two days prior to the day of
operation and consists of planning and coordination activities. This phase analyses
and decides on the best way to manage the available capacity resources and on the
need for the implementation of flow measures. One output is the Daily Airspace Plan
(DAP) published via the ATNS website (www.atns.co.za/atfm/dap), or by sending a
blank email to dap@atns.co.za and copy will be returned to you and forwarded via
email to subscribers.
3.3.3
Tactical Flow Management is applied on the day of the operation. This phase
updates the DAP according to the actual traffic and capacity. The management of
the traffic is made through ATC slot allocation and/or ad-hoc rerouting.
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3.4.
Areas subjected to ATFM
The ATFM adjacent area is the area, adjacent to Johannesburg, Cape Town and
Oceanic FIRs; this includes all the regional airspaces adjoining South Africa. Flights
originating from this area may be subject to ATFM measures when entering the
South Africa area.
The CAMU may apply ATFM Measures to flights which:
Depart, or arrive: Johannesburg (FAJS), Cape Town (FACT), Durban (FADN),
Bloemfontein (FABL), Lanseria (FALA), George (FAGG), Port Elizabeth (FAPE), East
London (FAEL), and Kruger Mpumalanga Intl Airport (FAKN). Other aerodromes and
airspaces within the Johannesburg and Cape Town FIRs may be subjected to ATFM
as well;
and/or;
Entering the Johannesburg and Cape Town, Oceanic FIRs after departing from an
adjacent Flight Information Region (FIR) within the ATFM adjacent area.
3.5.
Traffic Management Initiatives (TMI)
When conditions dictate that a TMI be instituted they could take the form of the
following: (refer Chapter 4: Traffic Management Initiatives)
Ground Delay Programs (GDP) may be instituted so as to delay the flights
on the ground and avoid excessive airborne holding or re-routings;
An Airspace Flow Programs (AFP) may be institute for an airspace
constraint. When an Airspace Flow Program (AFP) is declared, the area
subjected to the program will be called a flow constraint area (FCA);
A Ground Stop (GS) may be declared at an aerodrome when adverse
conditions or major ATS outages cause demand to exceed capacity to such a
degree that gridlock occurs at an aerodrome;
Level capping, and;
Rerouting of aircraft.
When an Aircraft Operator (AO) would benefit from a reroute or level capping in-lieu
of a departure delay then a rerouting proposal (RRP) would be offered. Aircraft
Operators would be required to respond by the time indicated in the message, to take
advantage of the RRP.
3.6.
Information on ATFM Measures
Information on ATFM measures will be distributed by the CAMU via the following
methods:
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3.6.1.
Bi-annual Airspace Operations Plan
The Bi-annual Airspace Operations Plan (AOP) document provides a consolidated
view of the forecast seasonal ATFM situation which includes the traffic and capacity
forecast, bottleneck identification and description of the associated ATFM and Traffic
Management Initiatives (TMI). The AOP is the final result of the operations planning
process which consolidates inputs from the aviation community involved in airspace
management operations (i.e. ATS Units, Aerodromes, Airspace Users, Military, etc.).
The AOP is published biannually by the CAMU – with summer and winter releases.
Each release can be updated twice per season. The first AOP will be available on
the 1st March 2010.
3.6.2.
The Daily Airspace Plan (DAP)
The Daily Airspace Plan (DAP) is produced the day prior to the day of operation. The
Daily Airspace Plan (DAP) will provide a summary of planned ATFM measures for
the 24 hours period. It is updated regularly. The current day‘s Daily Airspace Plan
(DAP) is the result of up to seven days of research, and historical data analysis within
the CAMU ATFM system. The Daily Airspace Plan (DAP) published via the ATNS
website (www.atns.co.za/atfm/dap), or by sending a blank email to dap@atns.co.za
and copy will be returned to you and forwarded via email to subscribers.
3.6.3.
The ATFM Flow Advisory Message (FAM)
The Flow Advisory Message (FAM) providing information to ATS Units, Aerodrome
Operators and Aircraft Operators about the implementation, revision, compression,
and cancellation of a Ground Delay Program (GDP), Ground Stop (GS) and Airspace
Flow Program (AFP) will be transmitted. Except for the cancellation of a Ground
Delay Program (GDP) or Airspace Flow Program (AFP), the FAM may include the
following items:
Aerodrome or Airspace;
Delay Assignment Mode;
Time frame;
Program Type. (Optional);
Program Rate;
Flights Included; (Optional, will be available on CAMU Web and on message
exchange)
Scope;
Additional ATS Units Included;
Exempt ATS Units;
Delay Assignment Table Applies To. (Optional);
Maximum Delay or Delay Limit. (As appropriate);
Average Delay. (Optional);
Reason;
Remarks.
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The Daily Airspace Plan (DAP) and Flow Advisory Message (FAM) will be
transmitted via AFTN and/or emailed to ATS Units and those Aircraft Operators and
Aerodrome Operators who wish to be included in the address list.
FAM
EVENT: GDP - FAJS
EVENT_START_TIME
201002011200
EVENT_END_TIME 201002012059
START_PROGRAM_RATE
1200-1900 ADR 30
1200-1900 AAR 30
ATS UNITS EXEMPTED: NIL
FLIGHT INCLUDED: LIVE ON
CAMU WEB
AVG DELAY: 8 MIN
COMMENTS EXCESSIVE DEMAND
FAJS
REG_CAUSE WD89
Flow Advisory Message
Ground Delay Program at FAJS
Starting time of the GDP,
YYYYMMDDhhmm
End time of GDP
YYYYMMDDhhmm
Between 1200-1900 – Aerodrome Dep rate
Between 1200-1900 – Aerodrome Arr rate
ATS Units that are exempted from
program
Flights included – refer CAMUWEB
Average delay of the GDP
Comments – reason
Regulation cause – refer to Annex 2
the
Figure 3-1 Sample of a FAM for a GDP at FAJS
FAM
EVENT: AFP FCA02
EVENT_START_TIME 201002041100
EVENT_END_TIME 201002041300
START_PROGRAM_RATE
1100-1300 AAR 04
ATS UNITS EXEMPTED: NIL
FLIGHT INCLUDED: LIVE ON CAMU WEB
AVG DELAY: 13 MIN
COMMENTS EXCESSIVE DEMAND FAJA ACC SOUTH
REGCAUSE: CE81
Basic map illustrating the FCA
(Only when sent by email)
Figure 3-2 Sample of a FAM for an AFP – FCA02
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3.6.4.
Collaborative Decision Making (CDM) Teleconference (Telcon)
Collaborative Decision Making (CDM) allows decisions to be taken, after
collaboration of relevant aviation community members, on the basis of the most
comprehensive, up-to-date and accurate information. This in turn will facilitate
decisions about flights to be made according to the latest information available,
thereby enabling the flight trajectory to be dynamically optimised to reflect near or
real-time events. This CDM process is a key enabler of the ATFM process allowing
the sharing of all relevant information between aviation community members so that
the best gate to gate trajectory of flights can be achieved. This will enable the
community members to update each other continuously on events within the strategic
to tactical phase.
To be efficient and to reach the required objectives, CDM should have the following
characteristics:
an inclusive process;
a transparent process; and;
a process that builds trust within the aviation community.
The principles of CDM have been implemented in the CAMU day-to-day operations,
planning and developments with active involvement of appropriate members of the
aviation community. An ATFM CDM Telephone conference (Telcon) with all relevant
ATS Units and appropriate aviation community members will be held at various times
to discuss current daily airspace plan (DAP), weather impact, flow rates, flexible use
of airspace (FUA), post event discussion, inputs from ATS Units regarding staffing,
consolidation of ATC sectors, anticipated traffic management initiative (TMI),
equipment, anticipated traffic volumes, constraints, current configuration and
aerodrome arrival rates (AAR), anticipated configuration and aerodrome arrival rates
(AAR), aerodrome departure rates (ADR), special events, military activities that
impact ATFM, and flow constraint areas (FCA) – current and anticipated.
3.6.4.1.
Planning and Review of ATFM Situation CDM Conferences
Each day at 0500 UTC the ATFS briefs attendees to the daily telcon on the current
ATFM situation in South Africa and prospects for the rest of day based upon the plan
the CAMU has constructed that day.
Follow up telcons may occur at ad hoc
intervals depending on circumstance. Special meeting may be scheduled due to
special events or situations.
Occurrence of these special conferences will be
advised by AFTN, email, or other methods.
3.6.4.2.
The CDM “System Approach”
The ―system approach‖ is a management approach that considers the impact of
individual actions on the whole national airspace. ATFM personnel facilitate a
―system approach‖ in managing traffic. They consider who or what may be impacted
and focus on a coordinated effort to ensure equity in the delivery of air traffic
services. A system approach is taken in collaborative decision-making activities with
the system stakeholders (stakeholders include air traffic control, airlines, general
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aviation, aerodrome authorities, South African Weather Services or any other
participants in the aviation community).
3.6.5.
CAMUWEB
CAMUWEB is an important part of the enhanced ATFM system, as it allows AOs,
aerodrome operators and ATS Units, access to information about TMIs. AOs will be
able to view flight details and manage their own ATC slots during a TMI. ATS Units
and aerodrome operators will be able to view all flights arriving and departing from
their aerodrome. Please refer to Appendix A: CAMUWEB User‘s handbook for
detailed information.
3.7.
Air Traffic Flow Management Position
The Air Traffic Flow Management (ATFM) position within the CAMU is manned by Air
Traffic Flow Specialists (ATFS) who have Principle Air Traffic Control experience and
was established to further enhance CDM and its practical application in ATC
operations. In pre-tactical flow management they manage the preparation of the
Daily Airspace Plan (DAP). For all ATFM operations, the ATFS is the point of contact
with the aviation community concerning ATFM measures.
ATFS will play an important role during special events and in the event of crisis
situation in South Africa whereby they will lead coordination with the aviation
community.
Through the daily activities of the CAMU, the ATFM position is the focal point for
strategic, pre-tactical and tactical information for the airspace and about ATFM
situations in South Africa. The ATFS will liaise with all relevant aviation community
members, aerodrome operators and ATS Units, proposing and implementing ATFM
developments. The ATFS will continue to monitor the national airspace system and
amend or implement TMI‘s as required, continually ensuring demand is balanced
against capacity and the equity for all airspace users.
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4.
4.1.
TRAFFIC MANAGEMENT INITIATIVE
Overview
This chapter explains terms, techniques, and programs associated with Air Traffic
Flow Management in the South African National Airspace (NAS). As flight operations
personnel and pilots, the effects of Traffic Management Initiatives (TMI) will be
experienced in highly congested airspace, which may be caused by traffic volume,
special events, system failures or weather conditions.
Knowing how to access relevant information and understanding air traffic
management initiatives will aid in planning flights, avoiding needless delay, and
assisting in gaining full access to the NAS. Customers may have dedicated resources
for coordinating with the CAMU personnel, but, as will be demonstrated, not only
airlines or large general aviation company gain benefit from understanding how air
traffic management initiatives may affect flights.
4.1.1.
Exemption from a Traffic Management Initiative (TMI)
TMI choices can be offered to pilots/aircraft operators that allow decisions based on
best business options (e.g., should it be decided to fly later or should the decision be
taken to reroute around the constraint).
4.1.2.
Compliance with traffic management initiatives
All operators have the right of refusal of a specific clearance and may elect an
alternative. Alternatives include, but are not limited to ground delay, diversion to
other aerodromes or request to stay on the filed route.
4.1.3.
Compliance with a TMI
Air traffic controllers and Air Traffic Flow Management specialists strive to ensure
TMI compliance. In special circumstances they may request exemptions for certain
aircraft. In the case of Ground Delay Programs (GDP) or Airspace Flow Programs
(AFP), the CAMU monitors compliance with the Airport Flow Tool (AFT). The AFT is
a computer program used by the CAMU to monitor aerodrome capacity, demand
balance, model TMIs, and evaluate alternative approaches to managing the traffic.
4.1.4.
NAS information
The CAMU website, www.camu.co.za , provides near real-time status information
about the NAS.
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4.2.
BASIC AIR TRAFFIC MANAGEMENT TECHNIQUES & TERMS
4.2.1.
Miles-in-Trail (MIT)
Miles-in-trail describes the number of miles required between aircraft departing an
aerodrome, over a fix, at an altitude, thru a sector, or route specific. MITs are used
to apportion traffic into a manageable flow, as well as provide space for additional
traffic (merging or departing) to enter the flow of traffic. For example, standard
separation between aircraft in the area control environment is ten (10) nautical miles.
During a weather event this separation may increase significantly.
4.2.1.1.
Delays attributed to MIT
Normally MIT is implemented in response to a specific situation. For example, the
CAMU has implemented a 30 MIT restriction on aircraft departing FAJS via UQ22
that will affect 10 aircraft in a one-hour time frame.
4.2.2.
Minutes-in-Trail (MINIT)
Minutes-in-trail describe the minutes needed between successive aircraft. It is
normally used when aircraft are operating in a non-radar environment or transitioning
to/from a non-radar environment. It may also be used if additional spacing is
required due to aircraft deviating around weather.
4.2.2.1.
Departure flow rates
During tactical traffic management CAMU may declare flow rates for certain routes
and aerodromes. For example, - traffic departing from FACT to FAJA TMA must
depart five (5) minutes apart.
4.2.3.
Airborne Holding
Planned airborne holding is used to manage a particular situation. At other times,
airborne holding is in response to a situation and is unplanned.
4.2.4.
Sequencing Traffic Programs
Sequencing programs are designed to achieve a specified interval between aircraft.
They may be software generated or determined by Air Traffic Flow Management
personnel. There are different sequencing programs to accommodate different
phases of flight. The Maestro arrival program assigns an arrival time to achieve a
constant flow of traffic into FAJS and FACT or over a common point.
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4.2.5.
Level Capping
4.2.5.1.
Using altitude to manage traffic flows
Altitude is used to segregate different flows of traffic or to distribute the number of
aircraft requesting access to a specified airspace sector. For Example, flights that
operate between FAPP and FAKN might be level capped below flight level 195 to
reduce traffic inside FAJS Area North East airspace.
Definition of “capping”
4.2.5.2.
―Capping‖ is a colloquialism for planning to hold aircraft at altitudes lower than their
requested altitude until they are clear of a particular area.
It is used during
constrained situations in the NAS and enables aircraft to continue to depart while
remaining ―underneath‖ a constrained airspace.
Notification of being “Capped”
4.2.5.2.
CAMU may send the Airline Operator a Rerouting Proposal (RRP) pre-tactically and
advise of the restriction. Tactically, the air traffic controller will advise in the
clearance to ―expect‖ a final altitude lower than the requested altitude, based on the
appropriate altitude for the direction of the flight.
4.2.5.3.
Fuel considerations
Each pilot in command has the option to refuse a clearance for safety reasons. If a
pilot cannot comply with a clearance, ATC is to be advised. At that time, different
options may be presented, including the option of taking a delay on the ground until
the situation in the airspace is resolved.
4.3.
ADVANCE AIR TRAFFIC MANAGEMENT INITIATIVES
4.3.1.
Ground Delay Programs (GDP)
A Ground Delay Program (GDP) is an air traffic flow management procedure where
aircraft are delayed at their departure aerodrome in order to manage demand with
capacity en-route or at their arrival or departure aerodrome. Flights are assigned
ATC departure slots times called calculated take off time (CTOT). Ground Delay
Programs will normally be implemented at aerodromes where capacity has been
reduced because of weather conditions, ATS failures or when demand exceeds
capacity for a sustained period.
They are implemented to ensure the demand in a particular piece of airspace or at an
aerodrome is kept at a manageable level, to preclude extensive holding and to
prevent aircraft from having to divert to other aerodromes.
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4.3.1.1.
Process of the GDP
The CAMU ATFM System uses software called Airport Flow Tool (AFT) that compiles
scheduled flight information and flight plans to calculate and then display graphically
the known demand airspace sectors and for arrival and/or departures at aerodromes.
When an average of demand versus capacity is noted, a GDP is modelled through
the AFT software. AFT assigns departure and arrival ―slots‖ to aircraft based on the
available capacity and flight arrival times, and adds delay in sequential order until
demand equals capacity.
Figure 4-1 Demand Graph from Airport Flow Tool illustrating demand and capacity
FAJS demand graph (Figure 4-1) before a GDP was issued for thunderstorm activity.
Note the airport arrival rate is 30 (blue line) and the demand has peaks and valleys.
The figure (Figure 4-2) below is the FAJS demand graph after the GDP was issued.
The GDP starts at 1300UTC with the airport arrival rate of 23 and departure rate of
20 until 1700UTC then the rate increases to 30 for the remainder of the program. The
demand is levelled out.
Figure 4-2 Demand Graph from Airport Flow Tool illustrating demand and capacity
after GDP
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All aircraft that have a filed a flight plan to a GDP aerodrome that are known to the
AFT software are assigned a calculated take off time (CTOT, see definitions below),
although not all aircraft will receive a delay.
Aircraft that are not in the original list of flights when the program is implemented will
also receive a delay. Their delay will be equal to the average Delay Assigned (DA,
see definitions below) to all other flights arriving in the 15-minute time interval that
their flight is requesting to arrive.
4.3.1.2.
Definitions of terms used in a GDP.
Calculated Takeoff Time (CTOT):
The runway release time (―wheels up‖) assigned to an aircraft in a GDP. CTOTs
appear on the appropriate CAMU Web Page located in the towers and terminal
facilities.
Delay Assignment (DA):
The delay that is assigned to an aircraft during a GDP.
Aggregate Demand List (ADL):
The traffic in the NAS that was known at the time the list was generated from the
Airport Flow Tool (AFT)
Program rate:
The number of aircraft that the GDP is to provide to the aerodrome, for each hour.
The program rate may not be the same as the arrival rate. In some instances, the
traffic is slowed for en-route sector complexity, caused by weather, even though the
arrival aerodrome is not constrained.
Aerodrome Arrival Rate (AAR):
The number of aircraft an aerodrome can accept in a one-hour time frame.
The AAR is determined by taking into consideration the runways in use, weather
conditions, aerodrome facilities and NAVAID limitations etc.
Aerodrome Departure Rate (ADR):
The number of aircraft an aerodrome can release in a one-hour time frame
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The table below illustrates the AAR for FAJS based on ground speed versus distance
between flights, the greater the ground speed and the less the distance between
flights results in a higher AAR. Figures in red indicate AARs.
AIRPORT ARRIVAL RATE [AAR] TABLE
Average Distance Between Aircraft on Final
Staggered
Parallel
Approach FAJS Rwy03
G/S
on
final
approach
CAP/HR = GS
DIS
Normal
LVPs
3NM
3.5NM
4NM
4.5NM
5NM
5.5NM
6NM
6.5NM
7NM
8NM
9NM
10NM
100
33
29
25
22
20
18
17
15
14
13
11
10
110
37
31
28
24
22
20
18
17
16
14
12
11
120
40
34
30
27
24
22
20
18
17
15
13
12
130
43
37
32
29
26
23
21
20
18
16
14
13
135
45
38
34
30
27
24
22
21
19
17
15
13.5
140
46
40
36
31
28
25
23
21
20
18
16
14
145
48
41
36
32
29
26
24
22
21
18
16
14.5
150
50
43
37
33
30
27
25
23
21
19
17
15
155
51
44
38
34
31
28
26
23
22
19
17
15.5
160
53
45
40
35
32
29
26
24
23
20
18
16
165
55
47
41
36
33
30
27
25
24
21
18
16.5
170
56
48
42
38
34
31
28
26
24
21
19
17
175
58
50
43
39
35
32
29
27
25
22
19
17.5
180
60
51
45
40
36
33
30
28
26
23
20
18
185
60
53
46
41
37
34
31
28
26
23
21
18.5
190
63
54
47
42
38
35
32
29
27
24
21
19
Table 4-1 Sample table used to determine AAR for FAJS
Key: GS – Ground Speed, CAP – Capacity, HR – Hour, DIS – Distance in NM
4.3.1.3.
Information detailing current GDPs
When a GDP is implemented, the CAMU details the parameters of the program(s)
and issues an advisory and can be found at www.camu.co.za. Current programs are
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also included in the daily airspace plan on the ATNS web at www.atns.co.za/dap.
Each line details the program aerodrome, the start and end times of the program,
flights included, scope*, reason, average delays (AVG), airport arrival rate (AAR),
program rate (PR), and the corresponding advisory number with hyperlink.
*Scope refers to the distance or ATS Units included in the GDP. While the program
may not cause all flights to be delayed, all flights will receive a CTOT. Flights outside
of the scope will receive a CTOT closely matching their proposed departure time.
4.3.1.4.
CTOT information
CTOTs for a GDP may be accessible through the CAMU webpage by entering the
tail number and date of flight, at www.camu.co.za. Slot Allocation Message (SAM) is
also sent to the Aircraft operator which includes the CTOT. In addition, operators
may also view their CTOT via the ATNS‘s File to fly website, www.atns.co.za.
4.3.1.5.
(TMI)
The process for implementing Traffic Management Initiatives
Air traffic Flow management specialists monitor the NAS for high demand
sectors/aerodromes/entry exit beacons on a continuous basis. When concern is
raised about a traffic situation at a specific sector/aerodrome/entry exit beacon (s),
CDM is held among impacted ATS Units, the CAMU, the aerodrome authorities and
the aviation community to discuss alternatives and modelled scenarios.
An advisory may be issued when a GDP is being proposed but not yet implemented.
If the decision is made to implement a GDP, then CTOTs will be sent to operators of
flights concerned, the CAMU Web page, and an advisory is issued that states a GDP
has been implemented. You may find more information about advisories via the
CAMU Web www.camu.co.za .
4.3.1.6.
Affect of GDP procedures on aircraft operators
All aircraft operators are expected to depart at the CTOT. Each aircraft operator
needs to arrange his taxi in a manner consistent with meeting the CTOT. If an
aircraft is late, aircraft operators are required to view the CAMU Web page to get a
new CTOT and pass it to the pilot. Operators are encouraged to release slots as
soon as they are aware that they will not make their CTOT, this will enable other
operators to use the released slot.
4.3.1.7.
How do I know what my CTOT is?
You may go to CAMU Web, www.camu.co.za , to obtain your latest CTOT that is in
place for your arrival/departure aerodrome, when there is a TMI. In addition you will
be sent a Slot Allocation Message (SAM) or Slot Revision Message (SRM) via,
AFTN, or e-mail. Failing that you may contact the CAMU or the ATC tower.
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4.3.1.8.
Changing of a CTOT
A CTOT can be changed, based on changing conditions at the GDP aerodrome e.g.
changing weather conditions or changes in the airport arrival/departure rate. Aircraft
operators may substitute their aircrafts‘ CTOTs to meet their schedule objective on
the CAMU Web Page.
4.3.1.9
Notification of a change in CTOT
Aircraft operators will receive a Slot Revision Message (SRM) via the e-mail or SMS,
they will also be able to go to the CAMU web for updates. Pilots may contact the
departure/arrival aerodrome‘s control tower to establish their CTOT.
4.3.1.10.
VFR Clearances
Air traffic controllers are required to provide VFR aircraft with the appropriate delay
assignment before providing the pilot with a clearance to the ground delayed
aerodrome. Operators are to check the CAMU Web prior to departure to see if a
GDP is in place. This information is also available from the departure ATS Unit, to
get the CTOT prior to departure.
4.3.1.11.
Time outside of the parameters for the GDP
GDPs are based on original scheduled arrival/departure times. In the case of a GDP
being in place for an arrival or departure aerodrome the estimated elapsed time
(EET) and average taxi time is considered in determining the appropriate departure
time. The CTOT may be assigned after the times listed in the GDP. In some cases
the CTOT is after the program time because excess demand will flow over into
subsequent hours, but must still be managed to ensure the balance between
capacity and demand. If your flight was estimated to arrive near the end of the GDP,
the flight may be assigned a CTOT that puts the arrival time after the GDP has
ended.
4.3.1.12.
Procedure to change departure time
Pilots should contact their operations who will in turn request a new slot via the
CAMU Web or contact CAMU if they need to change their departure time, however,
this may not necessarily change the CTOT.
4.3.2.
AIRSPACE FLOW PROGRAMS (AFP)
An AFP is a traffic management initiative that identifies constraints in the en route
system, develops a real-time list of flights that are filed into the constrained area, and
distributes Calculated Take Off Times (CTOT) to gauge the demand through the
area.
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4.3.2.1.
Process of the AFP?
If an AFP is issued and a flight is included, a CTOT will be issued. Meeting the
CTOT is important because it allows traffic managers to properly gauge flights
through the constrained area being controlled by the AFP. When an AFP is issued,
the CAMU will send an Advisory that will be emailed to AOs. The AFP will also
appear on the CAMU Web site. At aerodromes with an aerodrome traffic control
tower, controllers will provide the CTOT if not received it via the SAM/SRM message,
web page, when the pilot calls for clearance. If departing from an aerodrome
without a control tower, the CTOT can be determined for the flight by checking the
CAMU website at www.camu.co.za. This website will provide information regarding
the location and reason for an AFP. It will also provide a ―Look Up‖ function to
determine if your flight has received a CTOT.
It is important to check the CAMU website (before departure) to determine if the flight
is included in an AFP. Depending on the severity of the constraint leading to AFP, the
following may apply:
be assigned airborne holding to provide the delay necessary for
the flight to arrive; or
be rerouted to avoid the AFP altogether; or
need to land to absorb the delay; or
be allowed to enter the AFP with minimal delay.
There is a window of time in which to depart and so as not miss the CTOT. Flights
are asked to depart as close to the CTOT as possible. ATS Unit, flights may depart 5
minutes before the CTOT and up to 10 minutes after to assist with the tactical issues
at aerodromes. Outside of the 15 minute window, the following options are available:
Accessing the CAMU web site to obtain a new CTOT
At aerodromes without a control tower, you may:
1.
2.
Access the CAMU web site to obtain a new CTOT.
Contact the overlying ATC tower or the CAMU.
Should an operator not want to accept the delay then the following options are
available:
Contact the CAMU to calculate a re-route out of the AFP. If there is another
acceptable route available that would take the flight out of the AFP, a
Rerouting Proposal (RRP) will be sent should the operator accept the re-route
then a re-filing of the flight plan is required. Once the flight plan is re-filed an
SRM/SLC will be issued.
Make a stop enroute. In severe cases the pilot may elect to land at an
intermediate aerodrome to provide the delay necessary for the flight to arrive
at the AFP controlled time of arrival. If flight plan is filed into an existing
AFP, the flight will be treated as a ―popup‖, the flight will be assigned a CTOT
consistent with the delay received by other flights filed to enter the AFP at
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about the same time. If a flight plan is filed out of an AFP and into another,
the flight will be treated as a ―popup‖. The flight will be assigned a CTOT
consistent with the delay received by other flights filed to enter the AFP at
about the same time. In addition, the flight will forfeit the arrival slot in the
original AFP. If the flight is included in both an aerodrome ground delay
program and an AFP, the CTOT for the ground delay program will take
precedence.
It is recognised that the predicted demand through an AFP and the possible weather
impacting the area may change substantially over time. When the conditions
warrant, Air Traffic Flow Specialists will take steps to coordinate and implement
revisions to the AFP. In a revision, AFP entry slots are recomputed so that demand
is again metered to meet capacity and new CTOTs are sent via SRM and posted on
the CAMU Web page.
4.3.2.2.
Implementation of AFPs and coordination of all AFP decisions.
The ATFS in the CAMU will have oversight responsibilities for all AFPs.
4.3.2.3.
Scope of AFPs
It is expected that AFPs will be utilised to manage airspace constraints throughout
the NAS. They will also be used to manage situations such as increased traffic
demand as a result of special events, as well as equipment failures which result in
loss of capacity. This will provide traffic managers with an additional tool to manage
geographic areas that experience periods of complex, high volume traffic.
4.3.2.4.
AFP Arrival Rate
Based on the anticipated conditions, the ATFS will select an arrival rate based on
guidelines developed through analysis of historical data. These guidelines will be
refined over time. When ‗ad-hoc‘ AFPs are developed, the arrival rate may be a set
at the number of aircraft allowed to pass through the Flow Constraint Area (FCA) per
hour or may be a percent reduction of known demand.
4.3.2.5.
ground stop
Flights that have an AFP CTOT, but are part of an aerodrome
The ground stop has the higher priority. If the ground stop is lifted and the AFP is still
in place, the flight will get a new CTOT for the AFP along with a control type of RCTL
(re-control).
4.3.2.6.
Information on CTOT’s issued for AFP’s
ATS Units are currently unable to obtain AFP CTOTs information without contacting
the CAMU. The CAMU Web will display up to date information on AFPs. The web
page will show if your flight is included in the AFP.
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4.3.3.
GROUND STOPS (GS)
4.3.3.1
Definition of a Ground Stop
A Ground Stop (GS) is a procedure requiring flights that meet specific criteria to
remain on the ground. The GS may be aerodrome specific, related to a geographical
area.
4.3.3.2.
Reason for a GS
Ground Stops are implemented when air traffic control is unable to safely
accommodate additional aircraft in the system, in other words the demand is
exceeding the capacity to such an extent that a GDP is inadequate and severe
restrictions are required to manage the flow of traffic. They are most frequently used
for:
Severely reduced capacity situations such as:
Weather below user arrival minima;
Severe weather reducing usable routes;
Major equipment outages;
Catastrophic events.
Precluding extended periods of airborne holding.
Precluding sectors from reaching saturation levels.
Precluding aerodromes from reaching gridlock.
GS are normally reactive to the current situation, however, in some situations, they
may be planned in advance. For example, weather is forecast to develop along the
east coast. Aircraft may be released until the weather materializes, at that time, a GS
would be issued to ensure additional aircraft are not released until the operational
situation allows.
4.3.2.4.
The process for a GS
When one of the circumstances as stated above are present or there is indication
that they will occur the ATFS in the CAMU will institute a GS after doing various
modelling exercises.
4.3.2.5.
Current status or information on GS
GS information of 15 minutes or more is viewable on the webpage www.camu.co.za
4.3.4.
ADAPTIVE COMPRESSION (AC)
4.3.4.1.
Definition of Adaptive Compression
Adaptive compression is used to help ensure that all slots in a program are used. A
background process at the CAMU will automatically:
Monitor a GDP AFP for open slots.
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Identify those slots that are in danger of going unused.
Move other flights earlier to take advantage of those open slots.
Move the open slots later.
Update the databases with the changes.
Send notification (CTOT updates) to the aircraft operators about the changes via
SRMs.
4.3.4.2.
Benefits of Adaptive Compression
Higher utilization of the aerodrome/airspace capacity.
Aircraft Operators can be more proactive regarding constraints, restrictions, etc.
Reduced workload for the ATFS /ATC.
4.3.5.
Rerouting Proposals (RRP)
The RRP can be issued due to several circumstances. The following RRP have
direct impact on aircraft operators.
RRP due to Airspace Constraints and/or ATC capacity;
RRP due to Weather.
The RRP due to Airspace Constraints
The RRP due to airspace constraints includes restrictions on airspace sectorisation
and configuration in general. A specific airspace could eventually be closed (e.g.
TSA, etc) and now open at a given date and time (or vice-versa), allowing for a more
efficient use of airspace by AO‘s and airspace users in general. CAMU may suggest
a RRP to an AO for consideration to improve possible delay cause by traffic flows
constraint.
4.4.
FLOW CONSTRAINED AREA (FCA)
4.4.1
Definition of a FCA
Developed on an ad hoc basis, they are both three-dimensional volumes of airspace,
along with flight filters and a time interval, used to identify flights. They may be
drawn graphically, around weather, in the case of the ATFM tool they can be
automatically drawn around weather or they may be based on a particular
airspace/sector or element such as a VOR/FIX. They are used to evaluate demand
on a resource.
4.4.2.
Information on FCAs
When a FCA is declared, an AFP will be used to manage the constraints and a Flow
Advisory Message (FAM) will be published and a SAM will be issued for relevant
flights. The information will be displayed on the CAMU Web under initiatives.
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4.4.3.
Display of the FCA - graphically
The FCA will be shown in the FAM when viewed in an e-mail.
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5
TACTICAL SLOT ALLOCATION PROCESS
Air Traffic Control Slot allocation is an ATFM measure established to balance the
demand against capacity and to regulate traffic flows, thus making full and efficient
use of the available system capacity. Tactical slot allocation takes place on the day of
operation and replaces strategic, airport slot allocation. So as to ensure efficient
usage of airspace and optimized flight trajectories, aircraft operators adhere to:
strategic ATFM measures (e.g. strategic traffic routing/strategic airport slot
allocation etc);
general ATFM procedures including flight plan filing and CAMU web interaction
requirements; and;
current ATFM measures (e.g. specific measures applicable on the day in
question) Aircraft Operators shall ensure that their crews are informed of, and
adhere to ATC slots, issued by the ATFM service.
5.1.
Initial slot allocation process for IATA coordinated airports
The process of airport slot allocation (as described in SAAIP ENR 1.9) will continue
for coordinated airports. After receiving a strategic slot, AO‘s can expect to have
reasonable assurance that they can depart or arrive at an aerodrome at the time
allocated. This time is the time the aircraft is expected to be off blocks (EOBT) and
the time expected to be in block (EIBT). As these slots are allocated strategically or
pre-tactically and the situation often changes tactically and these times could change.
AOs are to keep to their airport slots and contact the relevant towers for changes.
5.2.
Slot allocation process
The implementation of ATFM slot management involves three major facets:
Permanent strategic slot management at the three busiest aerodromes:
FAJS, FADN and FACT as per South African ENR 1.9. This could be
expanded onto other aerodromes during special events and when the traffic
demand warrants it.
ATFM Slot management (tactical slot management) for both departures and
arrivals at FAJS; FACT and FADN. This could be expanded onto other
aerodromes during special events and when the traffic demand warrants it.
Collaborative integration of aircraft operators to enhance decision making.
The ATFM system internally purges its current pre tactical slot allocations for the
coordinated aerodromes and loads in the data as the baseline for the upcoming day,
normally at 0200 UTC.
The ATFM system interprets the schedule data and strategic slot allocations received
from Official Airline Guide (OAG) and Score system respectively and will start an
active Ground Delay Program (GDP). Based on the rate selected for each
aerodrome, the ATFM system will also track the slots that are not currently allocated
to flights; these are called unassigned slots. The resultant SAM/SRM messages
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from the slot assignments will be queued by the ATFM system until 2 hours to the
Earliest Off-Block Time (EOBT). However, the slot assignments are visible through
the ATFM system, the CAMU Web site, and Enhanced Substitution Module (ESM),
the latter, is a separate module which can be purchased by AO‘s. As AOs submit
new flight plans during the day, the ATFM system will assign unassigned slots to
flights that were not known at the time of the pre tactical import. These flights are
considered ―pop-ups‖, and they will be assigned any available slot as close as
possible to their desired EOBT/EIBT on a first-come, first-served basis.
The CAMU Web site enables a subset of the ATFM system client capabilities, e.g.
slot management and reporting capabilities. The CAMU Web site is password
protected and will provide different views for different types of users. Through the
CAMU Web site, the Aircraft Operator (AO) will be able to view their flights/slots and
all unassigned slots for a particular controlling element. By providing visibility into the
unassigned slots, the AO will also be able to generate a slot improvement if available
through the CAMU Web site. The AO will be able to swap their current slot for an
open slot based on their own schedule. The AO operator will be able to modify flight
data, swap slots between two of its own flights, suspend flights or cancel a flight.
The following flight data fields are modifiable by the AO via the CAMU Web site: ·
Earliest Estimated Take Off Time (EETOT) and Earliest Estimated Landing
Time (EELDT);
Controlled Time of Departure (CTD) and Controlled Time of Arrival (CTA);
Assigned Slot (SLOT); ·
Slot Hold Flag; ·
Cancellation Status.
5.3.
Slot management for arrivals and departures
The goals behind providing slot management on both the arriving and departing ends
are twofold: to assure AO‘s a manageable departure slot especially when the aircraft
is delayed and to more effectively manage scenarios where there is a large departure
demand. However, the major risk in managing departure rates is if an equivalent or
greater action is not taken with the arrival rates. The end result of this scenario is the
surface of the aerodrome may become gridlocked with aircraft.
Due to the risk of surface gridlock, as mentioned previously, the ATFS will determine
rates as an overall measure of aerodrome operations, including both departures and
arrivals. The ATFM system will be programmed with an overall aerodrome rate and
then set the appropriate mix of arrivals and departures within this rate. This decision
will be made with the required CDM taking place with relevant members of the
aviation community. The ATFM system will then assign slots according to the
blended rate. This approach will simplify the rate-setting process within the ATFM
system and will give the user a better model of overall aerodrome demand prior to
submitting the delay program. This will assist in preventing an ATFS from submitting
a GDP that may incur significant surface saturation.
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5.4.
Line of Flight Continuity
In implementing slot management for arrivals and departures, efficiency is gained by
knowing the connection between a flight arriving at an aerodrome and the potential
later departure slot that the same aircraft has at the aerodrome. If a GDP delays the
flight from arriving on schedule, then knowing the connection between arrival and
departure slot allows the ATFM system to be more efficient in assigning an
achievable departure slot for the same aircraft. To this end, it is required that AO
submit their aircraft registrations (tail numbers) into the flight plan in field 18 or via the
CAMU Web page. The ATFM system uses the registration number of aircraft, to
make the association between arrival and departure slots.
5.5.
Slot Precedence
A tremendous amount of complexity is created in the system as multiple slots are
assigned to a single aircraft. For example a flight departing FACT for FAJS that files
to fly through a Flight Constrained Area (FCA) that has an active Airspace Flow
Program and then returns to FACT through the same FCA. In this scenario, the flight
would have a departure slot at FACT, an arrival slot at the FCA, an arrival slot at
FAJS, a departure slot at FAJS, another arrival slot at the AFP, and finally an arrival
slot at FACT (6 slots!). Without a rule for slot precedence, this slot allocation problem
cannot be solved. The following slot allocation precedence is used for ATFM
regulations:
(in chronological order)
Aerodrome arrival slot
Aerodrome departure slot
AFP arrival slot
If this order of precedence is applied to the previous example, then all slots would be
based upon the slot allocation for arriving at FAJS.
5.6.
The Exemptions
The obvious exemptions to slot management are international flights that the ATFM
would not be able to communicate controlled departure times. International flights,
particularly long-haul international flights, would typically be included in the airport
slot data and therefore would hold a slot. However, these flights would not be
available for slot modifications through a revision or compression in the ATFM
system. In addition, when a CAMU operator runs a revision or compression to a
current flow management program, airborne flights are also exempt for obvious
reasons.
5.7.
Slot swapping
The ATFM system will allow AO‘s to retain their slots for substitutions and swapping.
However, after a certain time interval, if the AO has not placed another flight into a
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cancelled slot, then the slot automatically reverts back to the unassigned slot pool
that is available to all AO‘s and the ATFS to assign flights. Substitutions,
cancellations, and slot swapping is possible through three separate interfaces in the
ATFM solution: the CAMU Web site, the CDM Interface (ESM), and the ATFM
system directly via the ATFS. An AO has open access to the CAMU Web site and is
able to actively participate in the collaborative process through that site without
purchasing ESM.
5.8.
Allocation Stage
At a fixed time before the Estimated Off-Block Time (EOBT) of each flight, a slot is
allocated to the flight and a Slot Allocation Message (SAM) is sent to the AO‘s and
ATC. An allocated slot cannot be taken by another flight. However, an AO should
update an EOBT, if it is thought that the flight will not be able to comply. Moreover,
the slot allocated to a flight may be improved by the true revision process.
5.9.
Slot Compression Process
At certain times during a GDP or AFP, it may be favourable to run a Compression.
The Compression function exchanges delayed flights with open slots to lessen the
delay on flights. This is the semi-automatic mechanism that routinely attempts to
improve the slot of allocated flights; for a given flight, the true revision process takes
place after the SAM has been issued until a time parameter before the CTOT. This
parameter is linked to the Aerodrome of Departure (ADEP).
5.10
Slot Swapping Procedure
AO‘s may submit their request for a slot swap to CAMU either directly to the ATFS, or
preferably via the CAMU web. The prerequisites are that both flights have their slots
issued and that they are both subject to the same most penalising regulation. A
maximum of one swap per flight may be carried out, if the swap is feasible and has
no negative airspace/aerodrome effect.
Note: Normally, only two flights of the same AO may be swapped. Exceptionally, in
critical events at airports slots of two different AOs may be swapped on request via
the CAMU.
5.11.
Aerodrome Parameters
Taxi-time
The taxi-time at aerodromes is an important parameter taken into account in the slot
allocation process. Default taxi-time is specified for each runway at an aerodrome in
the ATFM system database but can be changed on the day of operation. Changing
taxi-time can resolve certain aerodrome operating problems without the need to
reduce capacity or to request an increase of the slot window beyond the existing 5+10 minutes around the CTOT.
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The taxi-time can be modified for a given time period. A modification of the taxi-time
will modify all flights having their EOBT inside the period, some issued slots may be
recalculated and a few short notice SRMs issued.
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6
SLOT ALLOCATION PROCEDURES
The slot allocation procedures detailed below are those applicable to the CAMU ATFM
system. They are applied to all flights subject to ATFM slot allocation departing from
within the ATFM area or from within the ATFM Adjacent area and entering the ATFM
area.
6.1.
Airport slots
The airport slot allocation procedures remain enforce as described in SA AIP ENR
1.9.1 part 1 and Aircraft Operators are to comply with their EOBT unless subjected to
an Air Traffic Control Slot. These slots will be available on the CAMU WEB on the day
of operation.
6.2.
Departure Slots
When other ATFM processes are exhausted, traffic management initiatives (TMIs) will
be applied by CAMU to balance demand against capacity and departure times will be
issued in the form of a Calculated Take Off Time (CTOT). AO‘s must plan their flight
to be ready for takeoff at the calculated take off time (CTOT) (At the holding point).
The calculated take off time (CTOT) is a nominal time with a tolerance of –5 to +10
minutes; this enables the ATC to manage traffic tactically
The calculated take off time (CTOT) is generally issued not later than 2 hours before
EOBT, however Aircraft Operators and ATS Units are to monitor the CAMU web for
the latest information on calculated take off time (CTOT) as this could change as
tactical conditions dictate.
The calculated take off time (CTOT) is included in a slot allocation message (SAM),
which is sent by the CAMU to:
The address notified in advance to the CAMU by the aircraft operator, or;
When the address is not known with the CAMU:
The ATC Tower of the aerodrome of departure, and;
If different, the flight plan originator;
The CAMU web‘s slot substitution and flight elements subpages.
Furthermore, ATC is informed about the calculated take off time (CTOT) issued. If no
slot allocation message (SAM) is received before EOBT, it can be assumed that the
flight concerned may depart in accordance with the filed EOBT.
Aircraft Operators shall arrange the departure of their flights to comply with the
calculated take off time (CTOT) issued. A slot window is available to ATC to optimise
the departure sequence. This is not for use by AO‘s who should plan an EOBT
consistent with the CTOT.
All flights subjected to a calculated take off time (CTOT) will be displayed on the
CAMU Web‘s Initiatives page.
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6.3.
Late Reception of Slot Messages
There are many mechanisms within the AFTM system to prevent, in normal
circumstances, the late transmission of a slot, or update to a slot. Nevertheless,
there are four conditions that can cause the late reception of a slot time:
Late Flight Plan Submission/Update. The flight plan is filed or modified (reception of
a FPL/DLA/CHG message by the ATFM system) shortly before the EOBT. If
needed, a SAM/SRM is sent immediately. Of course, in this case the SAM/SRM is
also late.
A TMI is Created or Modified. For flights having already received a slot, a SRM may
be sent.
Manual Intervention
The ATFS can manually allocate another slot to a given flight causing a SRM to be
sent.
Transmission Delay
The message is sent early enough, but due to transmission problems it arrives late.
The occurrence is limited but it may happen.
6.4.
Slot Adherence
AO‘s and ATC are jointly responsible for CTOT compliance at departure aerodromes.
6.4.1.
Aircraft Operators
In order to comply with a CTOT, AO‘s need to plan the departure of a flight so that
the aircraft will be ready for start up in sufficient time to comply with a CTOT taking
into account the taxi-time.
AOs shall inform themselves of and adhere to:
General ATFM procedures including flight plan filing, strategic ATFM
Measures and message exchange requirements.
and
Current ATFM Measures (e.g. specific measures applicable on the day in
question, such as ATFM slot or flight suspension).
6.4.2.
ATC
ATC is responsible for CTOT compliance monitoring at departure aerodromes.
Whereas the exact procedures to be followed will depend on the way that ATS is
organised at each aerodrome, the following requirements shall apply in all cases:
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ATS Units shall ensure that CTOT, if applicable, be included as part of the ATC
clearance. ATC shall take account of an applicable slot or flight suspension
when a clearance is issued.
ATS Units responsible for CTOT compliance monitoring shall be provided with
the necessary information concerning the ATFM Measures in force and CTOTs
allocated.
ATC shall provide all possible assistance to AO‘s to meet CTOT.
A slot tolerance (-5‘ to +10‘) is available to ATC to organise the departure
sequence.
ATC may deny start up clearance to a flight unable to meet its CTOT until
coordination with the CAMU / CAMU Web has been effected and a revised CTOT
issued.
6.5.
Slot Revisions
Revisions to CTOTs should, where possible, be coordinated between the AO and the
CAMU using the CAMU Web Slot Swap exchange procedures. However, it may be
the case that last minute revisions to CTOTs and slot extensions when the pilot is in
direct communication with ATC, are more easily or efficiently coordinated with the
ATFS via ATC.
6.6.
ATFM Contingency
In the event of the ATFM system failure, a number of appropriate procedures have
been put in place to minimise the impact on the aviation community.
For each contingency procedure instructions will be issued by the ATFS. In order to
permit an effective and orderly resumption of slot allocation by the ATFM system
following recovery, flight plan and flight plan update messages will continue to be
sent to the ATFM system throughout the whole period of operation of the contingency
plan.
6.7.
Flight Plans
All aircraft operators are requested to file non-repetitive (ICAO) flight plans at least 3
hours before EOBT to provide CAMU with accurate forecast of potential air traffic
demand. Early filing of flight plans will ensure that the calculated take off time
(CTOT) issued is as close to the requested EOBT + published Taxi time as possible.
Aircraft Operators (AO‘s) should be aware that filing a flight plan late may lead to a
disproportionate delay. It is in the best interest of Aircraft Operators (AO‘s) to initiate
prompt revisions or cancellations, thus permitting the system to maximise use of
available capacity and minimise delay. The later the revision is made the greater the
probability of a delay.
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6.8.
Duplicate Flight Plans
Duplicate Flight Plans is the term used to refer to the flight plans of flights which do
not take place i.e. flight plans that were not cancelled by the originators and another
flight plan has been filed. Only one Flight Plan shall exist at any given time for the
same flight.
It is absolutely essential that flight plan originators:
Cancel a flight plan as soon as they know that the flight is not going to take
place.
Cancel an existing flight plan before filing a replacement flight plan for the
same flight.
The existence of multiple flight plans is to be avoided at all costs as they will:
Present ATC with false information.
Impair the efficiency of the ATFM system.
Be responsible for the issuance of unnecessary new slots.
Cause additional unnecessary delays to regulated flights.
Lead to an under utilisation of ATC capacity.
6.9.
EOBT Requirements
It is a requirement for both ATC and ATFM, that the EOBT of a flight shall be an
accurate EOBT. This applies to all flights, whether subject to a flow management
regulation or not. Any change to the EOBT of more than 15 minutes for any IFR
flight intending to operate within South African Airspace shall be communicated to
the appropriate ATS Units.
When an AO submits an amendment message (e.g. DLA or CHG) to an ATSU, they
must always give the EOBT the earliest EOBT they may comply with. This time is
not directly related to the (new) CTOT provided in the SAM/SRM. The EOBT in the
flight plan should always reflect the time at which the AO actually wants to be offblocks. The EOBT should always be changed if the original EOBT established by the
AO cannot be met by the AO for reasons other than ATFM delay.
The following procedures are to enable an AO to meet the above requirements
whenever they know that the EOBT of a flight will require modification.
6.10.
Procedure for Modifying the EOBT of a Flight having
received an ATFM Slot.
During a TMI, operators must obtain a new slot via the CAMU WEB and then compile
with the following:
It is a requirement for both ATC and ATFM that the EOBT of a flight shall be an
accurate EOBT. This applies to all flights, whether subject to ATFM or not. Any
change to the EOBT of more than 15 minutes (+ or -) for any IFR flight must be
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addressed to CAMU via an amendment message (e.g. DLA or CHG). The Aircraft
Operator (AO) will receive a new Slot Allocation Message (SAM) or Slot Revision
Message (SRM), once the changes are made through the CAMU Web.
Once a flight plan has been filed for a flight subject to ATFM measures, any change in
EOBT of more than 15 minutes shall be submitted, using a DLA message or by
cancelling the original FPL and filing a new flight plan.
Aircraft Operators will be able to interact with CAMU via the CAMU website,
www.camu.co.za to amend calculated take off times (CTOT), suspend, de-suspend
and to perform a slot swap within own aircraft schedule or move the flight to the
acceptable open slot in the future.
In Summary:
AO is to obtain a new slot via the CAMU Web, and,
When amending the EOBT to a later time, a DLA or CHG message shall be
sent.
When amending the EOBT to an earlier time, a CNL message shall be sent to
an ATSU and shall be followed by a new flight plan with the new EOBT
indicated.
Or
Calculating your EOBT once a CTOT is sent:
Take the current CTOT, minus the taxi time, and send the new EOBT, which
must not be after this time e.g. EOBT 1000, CTOT 1100, but the flight cannot
go off blocks until 1042. The taxi time is 18 minutes. 1100 minus 18, = 1042.
The new EOBT must be earlier than 1042.
Possible Scenarios:
ATFM systems are continuously seeking to give zero delay, the CTOT of the flight
will never be earlier than the new EOBT plus the taxi-time.
Recommendations:
All CTOT revisions or cancellations are to be made preferably using the
CAMU Web Page interface
In all cases, it is in the best interest of AOs to initiate prompt
revisions/cancellations thus permitting the system to maximise use of
available capacity and minimise delay.
General information on ATFM messages used by the CAMU including the format,
messages fields and addressing procedures are included in paragraph 6.14. A
summary of all messages is set out in Annex 1.
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6.11.
CAMU Helpdesk
The CAMU is available to provide assistance to those AO‘s who have critical
operational problems which cannot necessarily be solved by use of the CAMU Web
interface or whose aircraft has a delay in excess of the average delay for the most
penalising regulation. The CAMU is also there to provide advice and assistance to
those AO‘s who do not have access to the CAMU Web page or who do not
understand the ATFM system.
The CAMU can assist, for example, with flights, which are delayed to the point where
they may no longer be able to operate because of night curfews, weather or crew
flight and duty times.
The CAMU telephone number is +27 (0) 11 9286433
When connected to the CAMU, callers are requested to provide the flight‘s ACID
before stating the problem. This enables the ATFS to display the relevant data
concerning the flight before any problem solving takes place. Callers, who have less
than the average delay and no specific operational flight critical problem to resolve,
should not call the CAMU. All calls to the CAMU are recorded for quality purposes.
AOs who require advice, assistance of a routine nature can also contact the CAMU.
For operational flight planning problems, AOs should call the relevant ATSU or
briefing office, not the CAMU.
The CAMU resources have to be focussed on assisting the more critical problems.
6.11.1.
Contact Details
While this document should cover all operational matters, the CAMU may be
contacted using the following methods:
Postal
Address:
Tel:
Fax:
Email:
CAMU (ATNS)
Private Bag X1
Bonaero Park
1622
SOUTH AFRICA
Site
Address:
CAMU (Johannesburg ATCC)
Gate 14
OR Tambo Intl Airport OPS
Complex
Bonaero Drive
Bonaero Park
KEMPTON PARK
+27 (0) 11 928 6433
+27 (0) 11 928 6420
camuhelpdesk@atns.co.za
6.12.
ATFM Messages
6.12.1.
Slot Allocation Message (SAM)
The SAM is used to inform AOs & ATS of the Calculated Take-Off Time (CTOT)
computed by the ATFM system for an individual flight, to which AOs/ATC must
adhere. This message is sent to AOs/ATS 2 hours before the last received EOBT.
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—TITLE SAM —ARCID SAA123 —ADEP FAJS —ADES FADN —EOBD 100303 —
EOBT 1020 —CTOT 1035 —REGUL FAJS — TAXITIME 0015 —REGCAUSE WA 84
Figure 6-1 Composition of Slot Allocation Message (SAM)
The SAM is used to inform AO‘s and ATS of the Calculated Take-Off Time (CTOT)
for an individual flight.
Normal response of AO’s/ATS to a Sam message
AO‘s must comply with the CTOT. A slot is issued as a Calculated Take-Off
Time (CTOT). The CTOT is defined as a time at which the aircraft shall take-off.
The calculation of take-off times takes into account the off-block times and an
average taxiing time for the runway in use at the airfield concerned.
6.12.2.
Slot Revision Message (SRM)
After the ATFM system has issued an initial SAM, subsequent updates may be
notified via the Slot Revision Message – (SRM). This message may be used to
indicate a delay increase or decrease. The SRM notifies a change of slot. It is
issued after the SAM, if applicable. AOs/ATC must comply with the NEWCTOT.
CAMU system sending of a SRM
A SRM is sent to notify all concerned of either a significant change (>5‘) to the
original CTOT or a modification of the most penalising regulation or both. Such
changes are due to circumstances unrelated to the flight e.g. the introduction of
a new restriction or a change to the parameters of an existing restriction the
ATFS are able to let all flights be considered for improvement.
In response to a DLA or CHG when the current CTOT is no longer compliant with
the new information.
When AO modifies slot on the CAMU web and the new slot is within a TMI then a
SRM will be sent, AO must then send a CHG/DLA message.
To notify all concerned of a routine improvement/deterioration of the CTOT.
—TITLE SRM —ARCID ABC101 —ADEP FAJS —ADES FADN—EOBD 100303 —
EOBT 0925 —NEWCTOT 0950 —REGUL FAJS — COMMENT CLDT 100303 1050—
TAXITIME 0010 —REGCAUSE WA 84
Figure 6-2 Composition of a Slot Revision Message (SRM)
Response of AOs/ATS to SRM
The NEWCTOT must be complied with
6.12.3.
Flight Suspense Message (FLS)
Indicates that a specific flight has been suspended in the system and is considered
as not taking off. The flight data is kept in the database, but suspended (closure of
an aerodrome for a long period, for example). The procedure for de-suspending a
flight is through a DLA, a CNL or a CHG, depending on the circumstances, that will
be explained in another part of the document.
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AOs may suspend their flights on CAMU Web and later de-suspend their flights into
open slots. This is used when an AO is experimenting technical difficulties and need
to temporarily suspend their flight. AOs are still required to send a CHG or DLA to
modify the FPL.
The ATFM system will cancel the original CTOT, issue the suspension with a Flight
Suspension (FLS) message and await the response of the AO.
—TITLE FLS —ARCID ABC101—ADEP FAJS —ADES FADN —EOBD 100303 —
EOBT 0945 —TAXITIME 0015
Figure 6-3 Composition of Flight Suspense Message (FLS)
6.12.4.
Slot Requirement Cancellation Message (SLC)
Sent to AOs/ATS to advise that a flight is no longer subject to ATFM measures and
may depart without delay or as per EOBT.
An SLC is sent to AOs/ATS to advise that a flight which has received a CTOT is no
longer subject to an ATFM restriction. It may be due to the change in parameters of
an existing restriction or its cancellation, or to the reception of a message from AOs
such as DLA, and CHG.
—TITLE SLC —ARCID ABC101 —ADEP FAJS —ADES FADN —EOBD 100303 —
EOBT 0945 —TAXITIME 0015
Figure 6-4 Composition of Slot Requirement Cancellation Message (SLC)
Response of AOs/ATS to a SLC
A flight may normally depart without an ATFM restriction.
When the SLC is issued after EOBT + 15 minutes the AO must update its EOBT by
sending a DLA.
6.12.5.
De-Suspension Message (DES)
This CAMU message indicates that a flight, which was previously suspended, is now
de-suspended and active in the system. No further action is expected after the
reception of a DES by the AO
The ATFM system sends a DES when a flight not subject to ATFM restrictions is desuspended. The original suspension could have been due to e.g. receipt of an
SAM, the effect of exceptional conditions, closure of aerodrome, termination of the
activation monitoring.
—TITLE DES —ARCID ABC101 —ADEP FAJS —ADES FADN —EOBD100303 —
EOBT 0945—COMMENT CLDT 100303 1055 —TAXITIME 0015
Figure 6-5 Composition of a De-Suspension Message (DES)
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The required action by the AO/ATC is to amend the EOBT by more than 15 minutes
later than the EOBT given in the flight plan by sending a DLA message.
6.13.
ATFM Messages Fields
Each ATFM message comprises a number of fields some of which are mandatory
and some optional. Their number varies according to the message type. The fields
used in ATFM messages are summarized as follows.
FIELDS
DEFINITION
ADEP
ICAO indicator of aerodrome of departure
ADES
ICAO indicator of aerodrome of destination
CTOT
Calculated Take-Off Time
EOBD
Estimated Off-Block Day.
EOBT
Estimated Off-Block Time
FILTIM
Date and time stamp of original message
NEWCTOT
Revised CTOT
NEWEOBT
Revised EOBT
NEWRTE
New Route
REGUL
Identifier for the restriction imposed (may include more than one)
Which aerodrome? Or FCA
RESPBY
Latest time by which a response is required
RVR
Runway Visual Range (this field is optional in certain messages)
COMMENT
Commentary
TAXITIME
Taxi Time
REGCAUSE
Regulation Cause – Refer Annex 2 *
TITLE
Title of the message
*REGCAUSE Field
In order to provide more specific nomenclature for delay causes and, at the same time, to
assist the post-flight analysis, the ADEXP field —REGCAUSE comprises:
a)
Reason for Regulation code (one letter code corresponding to the reason
assigned by the ATFM system to the most penalising regulation).
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b) Regulation Location code - one letter code: D, E or A), describing the phase of the
flight (Departure, Enroute and Arrival) affected by the most penalising regulation.
c) A space.
d) The IATA Delay Code in numeric (81, 82, 83, 84, or 89) or 00 when no IATA Code
available.
The —REGCAUSE appears in the SAM and SRM messages, and is associated only with
the most penalising regulation. The code appearing in the message is the code valid at
the time the delay was given to the flight. (see Annex 2)
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7.
REROUTING PROCEDURES
During the Tactical Phase, the ATFS monitors the delay situation and where
possible, identifies flights subject to delays that would benefit from a reroute.
This is achieved by selecting a flight and then either:
Choosing an alternative route.
or
Asking the ATFM system to process all possible options.
In both cases the ATFM system will consider the routes as well as the possible flight
level limitations and give the consequent result in terms of delay.
The ATFS will consult with the AO concerned about the choices. Once the final
decision is taken the selected route which will result in the booking of a slot for that
flight and at the same time trigger the sending of a Rerouting Proposal (RRP)
message to the originator.
AO‘s who wish to benefit from the offer shall
consequently modify their flight plan (either with a CHG or a CNL and refile).
To secure the new CTOT, the CHG / new FPL should be received before the
Respond By (RESPBY) time in the RRP. At the reception of the new route in the
flight plan, the CAMU system will merge it with the proposal. Then SLC, SAM or
SRM messages will be transmitted as appropriate.
7.1.
Rerouting Proposal (RRP) Message
The CAMU sends an RRP following the assessment of ‗WHAT-IF‘ reroute scenarios
which are initiated by the ATFS. The RRP may be issued after the transmission of a
slot (i.e. SAM) or prior to the slot transmission i.e. when a Provisional Take-Off Time
(PTOT) has been allocated to a flight internally in the system.
The flight has already received a CTOT corresponding to its original route.
A new CTOT is offered provided the flight is refiled along the proposed New Route
(NEWRTE).
ACTION
A RRP with a NEWRTE is issued.
—TITLE RRP —ARCID ABC101 —ADEP FAJS —ADES FADN —EOBD 100801 —
EOBT 1030 —ORGRTE APDAK UQ48 VAVAN —NEWRTE STV 2620S02850E
VAVAN—RESPBY 0900 —TAXITIME 0010
Figure 7-1 Composition of Rerouting Proposal (RRP) Message (1)
The flight has already received a CTOT corresponding to its original route.
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8.
EXEMPTIONS FROM ATFM SLOT ALLOCATION
8.1.
Flights that Qualify for Exemption from ATFM Slot Allocation
The following flights are exempted from ATFM slot allocation:
flights carrying the South African Head of State or equivalent status
[―STS/HEAD‖],,
flights conducting search and rescue operations [―STS/SAR‖],
flights authorised by the relevant States Authorities to include in the flight plan
―STS/ ATFMEXEMPTAPPROVED‖,
flights in state of emergency [―STS/EMER‖].
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ANNEXES
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ANNEX 1. ATFM MESSAGES LISTS
ATFM Messages issued by CAMU: SAM, SRM, SLC, FLS, DES, RRP.
The following tables give examples of all ATFM messages currently in use. The tables
include a brief description of each message and subsequent actions.
Message
Originator and Description
- TITLE SAM
- ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0925
- CTOT 1037
- REGUL FAJS
- COMMENT CLDT 100303 1237
- COMMENT PR03
- TAXITIME 0010
- REGCAUSE CA 83
- TITLE SRM
- ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0925
- NEWCTOT 1037
- REGUL FAJS
- COMMENT CLDT 100303 1237
- TAXITIME 0010
- REGCAUSE AD 89
- TITLE SLC
- ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0925
- TAXITIME 0010
- TITLE FLS
- ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0815
- TAXITIME 0010
SAM: Slot Allocation Message
- TITLE DES
- ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0815
-COMMENT CLDT 100303 1015
-TAXITIME 0010
ATNS/CAMU/00/32
Action
Sent to AO/ATC 2 Hours before last
received EOBT.
CAMUWEB shows CTOT.
The SAM is used to inform AOs &
ATS of the Calculated Take-Off
Time (CTOT) computed by CAMU
for an individual flight, to which
AOs/ATC must adhere.
SRM : Slot Revision Message
Sent to AO/ATC to pass or confirm
any revision to a CTOT following
the issue of the initial SAM.
This message may be used to
indicate a delay increase or
decrease.
Sent to AOs/ATS 2 hours before
the last received EOBT. AOs/ATC
must comply with the CTOT.
The SRM notifies a significant
change of slot. AOs/ATC must
comply with the NEWCTOT.
SLC:
Slot
Requirement
Cancellation Message
Sent to AO/ATC to advise that a
flight which has received a CTOT is
no longer subject to a restriction.
Flight may depart without restriction
unless a new message is received
later.
FLS : Flight Suspension Message
Sent to AO/ATC at or after Slot
Issue Time to suspend a flight due
to
exceptional
conditions
or
adverse weather conditions or AO
delays flight will enter suspension
mode on CAMUWEB.
DES : Flight De-suspension
Message
Sent to AO/ATC to de-suspend , a
SAM will be sent as well.
Page 49 of 114
Flight must be de-suspended to
become active again via the
CAMUWEB.
No action is normally required of
AOs/ATS and the flight if subjected
to ATFM regulation will be issued
with a CTOT.
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ENHANCED ATFM OPERATOR’S MANUAL
- TITLE RRP
-ARCID ABC123
- ADEP FAJS
- ADES FACT
- EOBD 100303
- EOBT 0925
- ORGRTE N0280F180 RAGUL
UQ10 WY DCT FACT
- NEWRTE N0280F180 RAGUL
BLV WY FACT
- RESPBY 0755
- TAXITIME 0010
ATNS/CAMU/00/32
RRP : Rerouting Proposal Message
This message is sent to an AO to
offer a reroute avoid the need for a
slot on a new route or to improve
the CTOT. A "respond by time" is
also added.
Page 50 of 114
The message is sent to an AO to
offer reroute to avoid or reduced a
delay
AO must response by RESPBY
time if contend with the RRP.
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ENHANCED ATFM OPERATOR’S MANUAL
ANNEX 2. REGCAUSE - DELAY CODES
Correlation between IATA delay codes and the CAMU‘s reasons for TMI‘s, the reasons are
indicted in REGCAUSE field and in the FAM.
CAMU DELAY CODES
Reason for Traffic
management
initiatives
CODE
Regulation
Location
EXAMPLE
D
ATC Capacity
C
E
Demand exceeds the capacity
A
D
ATC Ind Action
I
E
Controllers’ strike
A
ATC Routeings
R
E
Phasing in of new procedures
D
ATC Staffing
S
E
Illness; traffic delays on the
highway
A
D
ATC Equipment
T
E
Radar failure; RTF failure
A
A
Equipment nonATC
Ind Action nonATC
Military Activity
G
E
D
A
D
A
D
N
M
Lack of parking; taxiway closure; areas
closed for maintenance; demand
exceeds the declared airport capacity
Runway or taxiway lighting
failure
Firemen’s strike
E
Golden eagle;
FIFA football cup; Heads of
Government meetings
E
D
V
81
ATFM DUE TO ATC ENROUTE
DEMAND/ CAPACITY
RE 81
89
SD 89
82
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO ATC STAFF/
EQUIPMENT ENROUTE
83
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
SA 83
89
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO ATC STAFF/
EQUIPMENT ENROUTE
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
TD 89
AD 89
83
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
87
AIRPORT FACILITIES
GD 87
87
87
87
AIRPORT FACILITIES
GA 87
ED 87
EA 87
98
82
INDUSTRIAL ACTION OUTSIDE
OWN AIRLINE
INDUSTRIAL ACTION OUTSIDE
OWN AIRLINE
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO ATC STAFF/
EQUIPMENT ENROUTE
83
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
MA 83
89
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
PD 89
WD 89
84
RESTRICTIONS AT AIRPORT OF
DEPARTURE
WEATHER EN ROUTE OR
ALTERNATE
ATFM DUE TO WEATHER AT
DESTINATION
89
RESTRICTIONS AT AIRPORT OF
DEPARTURE
VD 89
83
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
VA 83
89
RESTRICTIONS AT AIRPORT OF
DEPARTURE
OD 89
81
ATFM DUE TO ATC ENROUTE
DEMAND/ CAPACITY
OE 81
00
AIRPORT SLOT ALLOCATION
OE 00
83
ATFM DUE TO WEATHER AT
DESTINATION
OA 83
82
83
73
Noise
A
D
E
E
Initial Airport Slot Allocation
A
ATNS/CAMU/00/32
83
82
89
Thunderstorm; low visibility; X
winds
A
O
ID 89
89
D
Other
89
D
A
Environmental
Issues
CA 83
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO ATC STAFF/
EQUIPMENT ENROUTE
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
98
P
W
83
ATFM DUE TO RESTRICTION AT
DESTINATION AIRPORT
A
D
Weather
CD 89
81
RESTRICTIONS AT AIRPORT OF
DEPARTURE
ATFM DUE TO ATC ENROUTE
DEMAND/ CAPACITY
89
A
Special Event
IATA Delay Cause
89
RWY23 closed due accident
A
Aerodrome
Capacity
Code
83
D
Accident/Incident
Page 51 of 114
CAMU
Regulation
Example Code
AIRPORT FACILITIES
AIRPORT FACILITIES
CE 81
IE 82
IA 83
SE 82
TE 82
TA 83
AA 83
ND 98
NA 98
MD 89
ME 82
PA 83
WE 73
WA 84
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ENHANCED ATFM OPERATOR’S MANUAL
ANNEX 3. PRIMARY FIELD COMPOSITION OF TACTICAL ATFM
MESSAGES EXCHANGE
ADEXP
Field
-TITLE
SAM
SRM
SLC
FLS
DES
RRP
Comment
1
1
1
1
1
1
ARCID
1
1
1
1
1
1
Message title (SAM, SRM or
SLC)
ACID - Aircraft ID - Callsign
-ADEP
1
1
1
1
1
1
-ADES
1
1
1
1
1
1
-IOBD
(1)
(1)
(1)
(1)
(1)
ADEP - Departure
aerodrome
ADES - Destination
aerodrome
Initial off-block date and time
-IOBT
(1)
(1)
(1)
(1)
(1)
Initial off-block date and time
-CTOT
1
(1)
CTOT - Take-off time slot.
(1)
CTOT - Take-off time slot.
EOBD – Estimated Off Block
Date
EOBT - Estimated Off Block
NEWCTOT
-EOBD
1
1
1
1
1
1
1
-EOBT
1
1
1
1
1
1
-REGUL
1
1
-TAXITIME
1
1
REGCAUS
E
-ORGRTE
1
1
1
1
1
1
Refer to ***** document for
content description
TAXITIME (from offline
config data)
Refer to ANNEX 2 for
content description
1
Original route
-NEWRTE
1
New route
-RESPBY
1
-REASON
(1)
Time by which a response to
the re-route has to be made
(filled in with a default value
off-line defined)
Regulation reason
0<
0<
0<
0<
0<
0<
Free text
COMMENT
The numerical code indicates the permissible cardinality of fields in the CAMU IFPS
messages:
"1" means: exactly one field of the specified type is required,
a "blank cell" means : this field is not in a message,
"(1)" means: a single optional field of the specified type is allowed,
"n<" means : n or more occurrences of this field can appear in a message
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ANNEX 4. ATFM RTF PHRASEOLOGY
SLOT
Calculated Take-Off Time (CTOT) delivery SLOT (time)
resulting from a Slot Allocation Message
(SAM). (The CTOT shall be communicated
to the pilot on first contact with ATC).
Change to CTOT [resulting from a Slot REVISED SLOT (time)
Revision Message (SRM)].
SUSPENSION
CTOT cancellation (resulting from a Slot SLOT
CANCELLED,
Cancellation Message (SLC)).
REPORT READY
Flight suspension until
(resulting from an FLS).
further
notice. FLIGHT
SUSPENDED
UNTIL FURTHER NOTICE,
DUE (reason)
Flight de-suspension (resulting from a De- SUSPENSION
Suspension Message (DES)).
CANCELLED,
READY
REPORT
DENIAL
Denying start-up when requested too late to UNABLE TO APPROVE
comply with the given CTOT.
START-UP
CLEARANCE
DUE
SLOT
EXPIRED,
REQUEST A NEW SLOT
Denying start-up when requested too early UNABLE TO APPROVE
to comply with the given CTOT.
START-UP
CLEARANCE
DUE
SLOT
(time),
REQUEST START-UP AT
(time)
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ANNEX 5. SUMMARY OF CAMU ATFM SYSTEM PARAMETERS
PARAMETER
BASIC DEFINITION
FPL Filing Time
The minimum time before EOBT for flight
plan filing when a flight may be subject to
ATFM.
The time at which the CAMU issues the SAM
to the AO and ATC at the aerodrome of
departure.
A slot is issued as a Calculated Take-Off
Time (CTOT). The CTOT is defined as a time
when the aircraft must take-off. The Slot
tolerance of -5 to +10 is primarily intended for
use by ATC to allow for aerodrome
congestion problems.
A RRP expires if no response is received
from an AO by the ―Respond by Time‖
(RESPBY) included in the message.
Slot Issue Time
Slot Window
RRP Time-Out
VALUE
At least 3 hours
before EOBT
2
hours
EOBT
before
-5‘ to +10‘ around
CTOT
30 minutes
ENHANCED ATFM OPERATOR’S MANUAL
ANNEX 6. ACRONYMS
AAR - Aerodrome Arrival Rate
ACC - Area Control Centre
ADEP - Departure Aerodrome
ADEP - Aerodrome of Departure
ADES - Aerodrome of Destination
ADL - Aggregate Demand List
AEET – Actual Estimated En route Time
AffAvgDelay - (Affective Average Delay) total delay divided by number of non-exempted
flights, calculated after running a GDP.
AFP - Airspace Flow Program
AFT - Aerodrome Flow Tool
AFTN - Aeronautical Fixed Telecommunication Network
AIC - Aeronautical Information Circular
AIP - Aeronautical Information Publication
Airborne Holding - A deterministic mathematical model used to calculate predicted airborne
holding.
AO - Aircraft Operator
AOCC - Aircraft Operator Control Centre
AOP - The Bi-annual Airspace Operations Plan
ARCID - Aircraft Identification
ARCTYP - Aircraft Type
ATC - Air Traffic Control
ATFM - Air Traffic Flow Management
ATOT /ALTD - Actual runway times (Departure/Arrival)
ATOT - Actual Take-Off Time
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ATS - Air Traffic Services
CAMU - Central Airspace Management Unit
CAP - Capacity
CDM - Collaborative Decision Making
CHG - Modification Message
CLDT – Controlled Landing Time
CNL - Cancellation Message
CNX – Cancelled Flight; Cancel
CTL_ELEM – If a flight is controlled (i.e., has a CTOT and CLDT), this field indicates the
constrained NAS element for which a ground delay program or ground stop was run.
Currently, the CTL_ELEM can be an arrival aerodrome or FCA.
CTOT - Calculated Take Off Time
DAP - ATFM Daily Airspace Plan
DEP - Departure Message
DES - De-Suspension Message
DEST - Destination
DLA - Delay message
EENTRY – Earliest Element Entry Time
EET - Estimate En Route Time in minutes
ELTOT/ELLDT - Earliest Take Off/Landing Times
ENTRY – Current, best, estimated time of entry for a flight into an FCA considering all data
sources
EOBD - Estimated Off-Block Date
EOBT - Estimated Off-Block Time
ETA - Updated Estimated (wheels-on) Arrival Time. Prefixes: P (proposed), E (estimated)
ETD - Updated Estimated (wheels off) Departure time. Prefixes P (proposed), E (estimated)
EXIT – Estimated Element Exit Time
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FAM - ATFM flow advisory Message
FCA - Flow Constrained Area
FIR - Flight Information Region
FL - Flight Level
FLS - Flight Suspension Message
FMP - Flow Management Position
FPL - Filed Flight Plan
FUA - Flexible use of Airspace
GDP - Ground Delay Program
GS- Ground Stop
HR - Hourly Rate
IATA - International Air Transport Association
ICAO - International Civil Aviation Organization
IOBD - Initial Off-Block Date
IOBT - Initial Off-Block Time
IOBT/IIBT - Initial Estimated Block Times
LOA - Letter Of Agreement
LVP - Low Visibility Procedures
MINIT - Minutes-in-Trail
MIT - Miles-in-Trail
NAS - National Airspace System
NEWCTOT - New Calculated Take-Off Time
NEWRTE - New Route
NOTAM - Notice to Airmen
OAG - Official Airline Guide
POBT/PIBT - Proposed block times (Off/In)
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REG or REGUL - Regulation
RESPBY - Respond by (time out to give a response)
RMK - Remark
RPL - Repetitive Flight Plan
RRP - Rerouting Proposal
SAM - Slot Allocation Message
SLC - Slot Cancellation Message
Slot List - A modified TMI file. In addition to the information provided by the TMI file, the slot
list includes the slot ID, flight class and information about exempted flights.
SOBT/SIBT - Scheduled Block Times (Off/In)
SRM - Slot Revision Message
TELCON - Telephone Conference
TMI - Traffic Management Initiatives
TSA - Temporary Segregated Airspace
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APPENDIX A. - CAMU WEB USER’S GUIDE
CAMU Web
Release 2.2.0 User Guide
Document Version 2.2
March 2010
Metron Aviation, Inc.
45300 Catalina Court, Suite 101
Dulles, VA 20166
ATNS/CAMU/00/32
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Table of Contents
1
Introduction
61
2
Accessing the Reports
62
3
Performance Report
64
4
Flight Status Report
69
5
Cancels That Flew Report
71
6
Compliance Reports
73
7
CTOT Before POBT Report
78
8
Pop-up Report
79
9
Time Out Delay Report
81
10
Duplicate Flights Report
83
11
Unassigned Slots Report
85
12
Events Report
86
13
Querying the Element Flight List
88
14
Looking Up Flights
92
15
Copying, Saving, and Printing a CAMU Web Report
95
16
Delegating/Undelegating Control
97
17
Substitution
98
Appendix A: Questions and Answers
101
Appendix B: CAMU Web User Roles
103
Appendix C: Acronyms
104
Appendix D: Warning and Error Messages
106
Appendix E: Revision History
114
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A-1. Introduction
This document serves as a reference guide for new users of Central Airspace Management
Unit (CAMU) Web. It provides instructions for accessing the CAMU reports and explains
how to interpret the information displayed in these reports.
CAMU Web is a web-based application that allows you to monitor current and cancelled
traffic management initiatives (TMIs).
CAMU Web generates ten different types of initiative-level reports:
1. Performance
2. Flight Status
3. Compliance
4. CTOT Before POBT
5. Cancels That Flew
6. Pop-Ups
7. Time Out Delay
8. Duplicate Flights
9. Events
10. Unassigned Slots
These reports are updated every five minutes with the most current Aggregate Demand List
(ADL) information.
The information provided in these reports helps you identify problems as they occur, so that
you can correct problems that impact TMI performance.
The format for the CAMU Web home page displays whether individual events within a TMI
are active or inactive. CAMU Web updates events to inactive when one of the following
occurs:
1. Purge — all active events become inactive.
2. The event is no longer controlling any flights.
3. Another (actual) event is issued (Airspace Flow Program [AFP], Ground Delay
Program [GDP] or Compression [COMP]). A Ground Stop (GS) becomes inactive
only if it is purged or is no longer controlling flights.
It is possible to have both a GDP event such as a revision and a GS executed within the
GDP active at the same time, if the GS did not encompass all flights in the GDP.
If a GS is active but a GDP has not been issued, only two reports are available: the
Compliance report, and the Events report. If a GDP is active at the same time as the GS, all
reports are available.
Note: A GS cannot be issued for an airspace element.
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A-2. Accessing the Reports
The reports are viewed using an internet browser. To access the reports:
Start your browser.
Go to the CAMU Web Home page (see Figure 1)
Enter your Username and Password and click Login. If you need to re-enter your
information, click Reset.
Figure 1: CAMU Web Home Page
The CAMU Web Initiatives page has a link for each aerodrome or airspace element that has
a TMI (see Figure 2). The cause for the initial SCORE program is Airport Slot. Revisions to
SCORE will reflect the values from AFT. Each initiative within an event is sorted by its report
time. When you click on a link for an aerodrome or airspace element with a GDP or AFP,
CAMU Web displays the Performance report for the selected aerodrome or airspace
element. GS initiatives take the user to the Compliance Report. The Element Flight List and
Lookup Flight reports are the only two reports accessible from the Home page. You can
access all other reports from the Reports Links navigation bar on the Performance Report
page.
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Figure 2: CAMU Web Initiatives Page
The Initiatives page also displays the status of initiatives. Table 1 explains the statuses and
their corresponding symbols.
Table 1: Current Initiative Statuses
Symbol
Status
Description
Event Controlling Flights
TMI is controlling flights in the element.
Event NOT Controlling
Flights
TMI is no longer controlling flights in the
element.
Links are also available for cancelled TMIs from the current day. The reports for the
cancelled TMIs are accessed in the same manner.
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A-3. Performance Report
The Performance Report shows whether the program is delivering the requested Program
Rate (see Figure 3). There are two types of aerodrome programs generated in the Airport
Flow Tool (AFT) system: Target and Max. Target programs have an overall Program Rate
set for the aerodrome. Max programs set a specific Arrival (A) and Departure (D) rate for the
aerodrome. The Performance Report will show the ―Max‖ or ―Target‖ label in the Program
Rate field to indicate which program type is in effect. Max programs will include specific
arrival and departure counts in each cell and the row labels will show ―(A/D)‖. Max program
drilldown reports can be generated for the arrival or the departure flight lists. Target
programs will show a combined aerodrome-level value in each cell and the drilldown report
shows both arrival and departure flights.
Airspace programs, since they do not include departure data, use a single Program Rate
value in the Performance Report.
Figure 3: Performance Report
For each program hour, the report displays the program rate, number of slots, number of
cancellations, extra demand, displaced demand, and the total demand expected. These
counts are the key to understanding why the program is over or under delivering for a
particular hour. An explanation of each count is displayed in the following section:
AFT Program Rate (Target) / AFT Program Rate (Max): The rate set in AFT by the traffic
management specialist. The rate shown will be pro-rated for partial hours at the beginning of
the program. The rate will also be pro-rated if it changed in the middle of an hour due to a
revision.
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Number of Assigned Slots: The number of slots AFT created for that hour. Sometimes the
number of slots does not equal the requested program rate due to a number of factors. See
Appendix A for further explanation.
Flights Controlled By Another Initiative: The number of flights passing through, departing
from or arriving at the current element that another TMI controls. These flights have a
―CTL_ELEM‖ value that is different than the current element for which the TMI was created.
This number is positive.
Cancellations: The number of cancelled flights in the hour. This number equals the number
of squares on the AFT timeline for the hour. The number is always a negative number.
Note: The CAMU Web System displays all cancellations of flights with
slots for each hour of the TMI on the Cancellations Row.
Extra Demand: The number of extra flights showing up in the hour that do not have an AFT
assigned slot in the hour. This number is the sum of those flights that are pop-up (nonscheduled) flights in the current hour, arrival flights with an assigned slot in an earlier or later
hour but an ETA in the current hour, and departure flights with an assigned slot in an earlier
or later hour but an ETD in the current hour. Occasionally extra demand may be due to
―Non-program‖ flights. These are flights that were not originally given a slot by AFT because
they were not expected to arrive during the program hours. For instance, flights may delay
into the first hour of the program after the initial program is run.
Flights Prior to Their Control Hour: The number of flights which should have shown up in
the hour (they have slot times in the hour), but are expected to arrive or depart in an earlier
hour due to an early departure or some other reason.
Flights After Their Control Hour): The number of flights which should have shown up in
the hour (they have slot times in the hour) but are expected to arrive or depart in a later hour
due to a late departure or some other reason.
Total Current Demand: The total number of flights expected to arrive in the hour at the ADL
time shown at the top of the report. The Total Current Demand for an hour equals the
number of slots allocated minus the ―No-shows‖ (i.e., the Cancellations and flights Arriving
Prior to and After Their Control Hour) plus the extra flights arriving in the hour that do not
have slots in the hour (i.e., the Extra Demand).
Number of Unassigned Slots: The total number of Unassigned Slots for a GDP or AFP
event. If a 0 is displayed in the place of the number, then all the available unassigned slots
have been used up in the program for that hour. Clicking on the number causes a list of
Unassigned Slots for the appropriate hour to appear and displays it underneath the
Performance report.
Total Potential Demand: The sum of the Total Current Demand row and the Number of
Unassigned Slots row for each hour. Clicking on the number generates a combination of the
unassigned slot list and the total current demand list for the appropriate hour and displays it
underneath the Performance report.
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Drop Outs: The number of flights that have rerouted out of an AFP. This number is positive.
Clicking on the number generates a flight list of drop out flights for the appropriate hour and
displays it underneath the Performance report. This row only is displayed for airspace
elements.
Ground Stop Only
Since there is no AFT Program rate associated with a GS, it is not possible to generate the
performance report. The Compliance Report shows all non-compliant GS flights for all active
ground stops at the aerodrome being viewed.
Drill Down Capabilities
Click on the associated link to view the flights that comprise each count. Where A/D is
displayed, click the left side or ―A‖ for arrival information or click the right side or ―D‖ for
departure information.
Click Extra Demand A/ for the 1400 hour. The resulting flight list shows all of the aircraft that
are expected to arrive in the 1400 hour that do not have AFT assigned slots in this hour (see
Figure 4). To view the departure information, click Extra Demand /D.
Figure 4: Hour Extra Demand /A
Note: For airline users, general aviation and military flights are
not displayed, so the number of flights displayed in the report
may be fewer than the count shown in the performance table.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Sorting
By default CAMU Web sorts the flight lists displayed on the performance report by Slot Time.
Click on any of the underlined column titles to re-sort the flight list by the column selected.
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Note: Sorting by the Entry column title causes the Slot Time
column title to rename to Entry Hour. Sorting by the ETA or ETD
column title causes the Slot Time column title to rename to Arrival
Hour or Departure Hour.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Usage
Determining why there is over or under delivery
The counts in combination with the comments in the drill down flight lists show why an hour
is heavy or light. For example, if three additional flights are expected to arrive in the 2100
hour that do not have slots in this hour. The reason for the extra demand may be due to two
flights that were supposed to arrive in the 2000 hour that are no longer expected to arrive in
this hour due to errors in EET estimation and, for one flight, a time out delay into the 2100
hour. If no flights have been cancelled and one flight is arriving prior to its controlled time,
then the net balance (i.e., the total demand) is 57 flights – two flights more than the
requested program rate of 55.
Determining whether a compression or revision is needed
You can use the information provided in the Performance Report to determine whether an
event needs a compression or revision. To determine if you need to take any action and
what type of action is most appropriate, compare the requested Program Rate to the
Number of Slots and the Total Demand for future hours, as described in the following
section.
No Action Required
If the Total Demand equals the Program Rate, there are no cancellations, and there has
been very little shift in demand, no action should be necessary. The demand graph in AFT
appears ―smooth‖ and the AFT timeline has very few triangles and no squares.
Note: The number of “Flights Arriving Before Their Control Hour”
and the number of “Flights Arriving After Their Control Hour”
show the degree to which demand has shifted.
Compression Only
If the Total Demand is less than or greater than Program Rate, but the Number of Slots
equals the Program Rate, and there is no pop-up traffic then a compression should suffice.
CAMU Web lists pop-ups that do not have a slot at the top of each hour in the Extra Demand
flight lists. To view the Extra Demand flight list for an hour, click on the Extra Demand count
for that hour. The Pop-Up report also shows the amount of pop-up traffic expected in each
hour.
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Ration by Schedule with Compression (RBS++)
If Total Demand is less than or greater than Program Rate, and Number of Slots is less than
or greater than Program Rate, or there is a significant amount of pop-up traffic, then the
event needs a revision.
GDP Modelling
The Performance Report shows the impact of GDP actions/modelling choices. For example,
after a GS is issued, the number of slots assigned per hour no longer equals the Program
Rate. Issuing a GS redistributes the arrival slots based on the GS release time - not the
Program Rate. Issuing Estimated Departure Clearance Time (EDCT) updates also moves
arrival slots and may cause the number of slots to differ from the Program Rate.
The presence of large negative estimated en route time (EET) fluctuations may indicate a
lack of slot availability when a large number of flights are exempted in RBS++. See the
Events Report to determine how many flights were exempted for a particular event. This
report displays the total number of flights included in each program event as well as the
number of flights affected. The difference between these two numbers equals the number of
exempt flights for that event.
AFP Modelling
The Performance Report shows the impact of AFP actions/modelling choices. See the
Events Report to determine how many flights were exempted for a particular event. This
report displays the total number of flights included in each program event as well as the
number of flights affected. The difference between these two numbers equals the number of
exempt flights for that event.
Detecting Airborne Holding
Large positive EET fluctuations for flights that have already departed may be an indication of
airborne holding.
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A-4. Flight Status Report
For GDP and AFP initiatives: The Flight Status report shows the current status of all program
flights arriving or departing within the program and any flight arriving or departing outside of
the program with a GDP control or AFP control (see Figure 5). By default, the Arrival report
is displayed. To display the Departure report (which is only available for aerodromes), click
the Flight Status (Departure) link located below the report title.
Note: When you sort by Entry Time for an airspace element (FCA),
the Arrival Hour column header changes to Entry Hour. Also,
when you sort by Exit Time for an airspace element (FCA), the
Arrival Hour column header changes to Exit Hour.
Figure 5: Flight Status Report
For airspace elements (e.g., FCAs), Entry time is used instead of ETA since ETA measures
the flight‘s arrival at its destination aerodrome, not the FCA. The Entry time is the time at
which a flight enters an airspace element‘s boundaries.
Note: Airspace elements also have an Exit field, the time a flight
traversed out of the FCA, and CTL_ELEM indicates the initiative
that is currently controlling the flight.
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Sorting
By default CAMU Web sorts the flight lists displayed on the Flight Status report by
Arrival/Departure Hour. Click on any of the underlined column titles to re-sort the flight list by
the selected column. FCA data sets are sorted by ENTRY.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Exclusions
CAMU Web does not display general aviation and military flights for airline users.
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A-5. Cancels That Flew Report
The ―Cancels that Flew‖ report shows all controlled flights that were cancelled then operated
without being reinstated via a FM, FZ, or FA message (see Figure 6).
Figure 6: Cancels That Flew
The Cancel-Reason column shows the most current cancellation reason. If a flight has
multiple cancellation flags set, only one cancellation reason is displayed according to the
following precedence: SX, FX, TO, DV, RS, DO. By default, the Arrival report is displayed;
click Cancels That Flew (Departure) link located below the report title to view the departure
version for aerodromes.
Sorting
By default CAMU Web sorts the flight lists displayed on the Cancels That Flew report by
Arrival/Departure time for aerodromes and ENTRY for airspace elements. Click on any of the
underlined column titles to re-sort the flight list by the selected column.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Usage
An airline may unintentionally operate a cancelled flight because they are unaware that it
was cancelled. Typically, this occurs when a flight has been timeout cancelled by the
system. Review the cancellation reason for the flights in this report. The presence of flights
that operated after time out cancelling may indicate the airline is having difficulty keeping
their flight data current.
System gaming can be identified by looking for flights that are cancelled, subbed, and then
operated at the original slot time. Look to see if any of the ―Cancels that Flew‖ were SX or
FX cancelled. For those identified, click on the ACID to view the flight history. Review the
CTL_Type field to see if the flight was subbed. Also check to see if the flight departed at its
current CTOT or the original CTOT assigned to the flight prior to being cancelled and
subbed.
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Exclusions
Diversion cancellations are not included in this list.
CAMU Web does not display general aviation and military flights for airline users.
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A-6. Compliance Reports
Aerodromes and airspace elements include a Departure Compliance report that shows
flights‘ compliance with their controlled time of departure at their origin aerodrome (see
Figure 7). For aerodromes, the Departure Compliance report defaults to show arrival flights‘
departure compliance; the user can access the departure flights‘ departure compliance by
clicking the link under the report title. For airspace elements, CAMU Web displays the
Departure Compliance report for arrival data only since there is no departure data in
airspace data sets. Airspace elements have an Arrival Compliance report as well, which
shows the airspace flights‘ compliance with their arrival times at the FCA.
The compliance flight list shows all flights that did not comply with their assigned controlled
time of departure regardless of whether they were controlled by a GS, AFP, or GDP when
they departed. A departure flight is considered non-compliant if it failed to depart within a
specified compliance window; an arrival flight is non-compliant if it failed to arrive within the
compliance window. When measuring departure compliance, the CTOT column shows the
CTOT used to measure compliance. For GDP or AFP controlled flights this is always equal
to the CTOT the flight had at departure. Arrival compliance uses CLDT.
The compliance window is the maximum number of minutes a flight may depart (or arrive)
prior to its CTOT (CLDT) or after its CTOT (CLDT) and still be considered compliant.
Currently, CAMU Web uses a (-5, +5) minute compliance window. This means a flight is
considered non-compliant if it departed early by more than five minutes, or it departed late
by more than five minutes. The compliance parameters are displayed underneath the report
header.
―GDP‖ is displayed in the Control Action column if a GDP controls the flight
when it departs.
―AFP‖ is displayed in the Control Action column if an AFP controls the
flight when it departs.
―GS‖ is displayed in the Control Action column if a GS controls the flight
when it departs. For GS flights, CAMU Web always shows the CTOT used
to measure compliance.
If an update is issued for a GS flight, CAMU Web shows the update time
and uses this time to measure compliance.
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Figure 7: Departure Compliance Report (Arrival)
Note: CAMU Web uses the CTOT assigned to the flight when it
departs to measure compliance.
FCA Arrival Compliance Report
In the top left-hand corner of the Departure Compliance report for an FCA is a link to the
FCA Arrival Compliance Report. This report displays a list of all AFP impacted flights that are
not Control Time of Arrival (CLDT) compliant. Non-compliance is anything outside of a plus
or minus five minutes entry window (+/- 5). You can get back to the departure Compliance
report by clicking on the Compliance link in the left-hand menu bar.
When you sort by Entry Time for an airspace element (FCA), the Departure Hour column
header changes to Entry Hour.
Sorting
By default, CAMU Web sorts the flight lists displayed on the Compliance reports by
Arrival/Departure time for aerodromes and by ENTRY for airspace elements. Click on any of
the underlined column titles to re-sort the flight list by the selected column.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
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Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Compliance Remarks
The Non-Compliance Reason column on the Compliance report allows you to enter a
reason for non-compliance for a specific flight. Click the Reason link in the Non-Compliance
Reason column to open the Compliance Remarks window for the associated flight (see
Figure 8).
Figure 8: Compliance Remarks
You must complete all fields displayed on the form prior to clicking Submit.
To specify a Non-Compliance Reason:
Click on the Non-Compliance Reason dropdown menu to display a list of reasons.
Select one of the following reasons:
Aircraft Operator
Equipment
TMI
Weather
Other
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Note: Click on the Help button for a description of each reason.
Provide a more detailed explanation of the circumstances which prevented the
flight from departing in the Comments text area.
Note: For ATNS users, the person submitting the information
should provide his or her aerodrome ICAO ID and operator
initials. Airline users should enter their three letter carrier
abbreviation in the Facility ID textbox.
Click Submit. CAMU Web records the following information in the CAMU Web
database: the flight ID, the non-compliance reason, the comments entered, the
current UTC time, the facility ID, the operator initials, and the IP address of the
sender. Storing the preceding information allows the non-compliance data to be
matched back to other flight information in the CAMU Web database, for
reporting and analysis purposes.
You receive confirmation that the information you provided has been saved.
The reason entered is displayed in the compliance report instead of the word
―Reason‖.
If the reason you entered is not displayed in the Non-Compliance column, click
on your browser‘s reload button. The link should now reflect the last reason
entered for the flight. Other users will not see the reason entered until the
compliance report is reloaded in their browser. CAMU Web reports
automatically reload every three minutes. Any time a user clicks on a NonCompliance Reason link, CAMU Web checks to see if any prior information was
entered for the flight.
To update the Non-Compliance Reason
You cannot edit information that has been submitted. However, you may provide an
alternative reason and additional comments. To do so, follow the same procedure as
previously described. When you click on the link in the Non-Compliance Reason column,
any information previously entered for the flight is displayed at the top of the Compliance
Feedback window. You may select an alternative reason or the same reason as previously
entered. Before clicking Submit, you must also enter information in the Comments, Facility
ID, and Operator Initials fields. Once you click Submit, the last reason entered will be
displayed in the Non-Compliance Reason Column for the associated flight.
Exclusions
―Cancels that Flew‖ are not displayed in the Compliance report. Ground stopped flights that
departed prior to receiving a control time and international flights are also excluded. Flights
that departed, for which no DZ message was received, are excluded. The ATOT field is
blank for these flights.
For airline users, non-compliant general aviation and military flights are not displayed.
Usage
The Compliance Report can be used to identify ATNS facilities that are not releasing flights
within the compliance window as well as airlines that fail to depart within the compliance
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window. Sort by DFIR to see if the aerodromes within a particular FIR are releasing flights
early or late. A lack of compliance within a particular departure FIR may indicate the FIR is
trying to deal with local traffic management initiatives such miles-in-trail restrictions. Sorting
the Compliance report by ACID can help identify airlines that are consistently departing
flights early or late. However, when looking at airline compliance, keep in mind that late
departures may be due to departure delays at the origin – not airline delays.
Note: The accuracy of the compliance report can be affected by
suspension of EDCTs, “white hat” approvals for which an EDCT
update was not submitted, and ground stops that are not
implemented using AFT. When any of the preceding events occur,
a flight’s CTOT is not updated in the data; thus, the flight may
appear non-compliant.
How CAMU Web Measures Compliance
If a flight is controlled by a GDP or AFP when it departed, compliance is measured using the
specified compliance window (currently -5, +5).
If a flight is controlled by a GS when it departed, the flight will be considered compliant if it
departs after the end time of the GS (ATOT greater than or equal to CTOT from the GS). If
an airline subs the GS flight and changes the CTOT, CAMU Web will still measure
compliance based on the CTOT assigned by the GS, except in the case where the
substitution resulted in a CTOT outside of the GS parameters. In the event that a
substitution assigns a control time prior to the start time of a GS or after the end time of a
GS, compliance will be measured based on the CTOT assigned by the substitution using a (5, +5) minute window. If an update is issued for a GS flight, CAMU Web will measure
compliance based on the update time using the current compliance window.
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A-7. CTOT Before POBT Report
The CTOT before POBT report shows all flights with a CTOT that are earlier than their
POBT and have either not departed, or have departed and are non-compliant based on the
compliance window (see Figure 9). A flight is displayed on this list under one of two
conditions- it receives a CTOT earlier than its POBT, or a POBT is submitted after the CTOT
was assigned and it is later than the CTOT. If the flight departs and is compliant, the flight is
removed from the list. If it is non-compliant after departure, it stays on the list. Also, if a
program event runs, and the flight receives a new CTOT that is later than its POBT, the flight
is removed from this report.
By default, the Arrival report is displayed. To display the Departure report, click the CTOT
Before POBT (Departure) link located below the report title.
Figure 9: CTOT Before POBT
Sorting
By default CAMU Web sorts the flight lists displayed on the CTOT Before POBT report by
Arrival/Departure time for aerodromes and ENTRY for airspace elements. Click on any of the
underlined column titles to re-sort the flight list by the selected column.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Exclusions
―Cancels that Flew‖ are not displayed in the CTOT before POBT Report. Ground stopped
flights that departed prior to receiving a control time and international flights also are
excluded.
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A-8. Pop-up Report
The Pop-Up Report shows all pop-ups arriving (or expected to arrive) during the program
hours (see Figure 10). For the purposes of this report, a pop-up flight is defined as any flight
that does not have a SOBT/SIBT and was not in the ADL data at the time the initial program
was modelled. This list shows all pop-ups regardless of whether they have subsequently
been given a slot in a revision.
Figure 10: Pop-up Report
The Pop-up Time column shows the time the flight first appeared in the ADLs. The TOD
Minutes column indicates whether the flight is currently in time out delay. The CancelStatus column shows whether the flight has been cancelled. If a flight has multiple
cancellation flags set, only one cancellation reason is displayed according to the following
precedence: SX, FX, TO, DV, RS, DO. The Subbed column indicates whether the flight has
ever been subbed by the airline via a SX message or simplified sub message.
Note: For airspace elements (i.e., FCAs) Entry time is used
instead of ETA since ETA is not applicable to an airspace element.
The Entry time is the time at which a flight enters an airspace
element’s boundaries.
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Sorting
By default CAMU Web sorts the flight lists displayed on the Pop-Up report by Pop-Up time.
Click on any of the underlined column titles to re-sort the flight list by the selected column.
Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Exclusions
CAMU Web does not display general aviation and military flights for airline users.
Usage
The pop-up report shows the unscheduled flights that have been filed since the initial GDP
or AFP was executed. To see how many pop-ups have been filed since the last
revision/extension, sort the pop-up list by pop-up time and look for flights whose pop-up time
is later than the model time of the revision/extension.
Sort the pop-up flight list by ETA (for GDPs) or ENTRY (for AFPs) to determine if the excess
demand for a particular time period is due to pop-up traffic.
Sort the Pop-Up Report by ACID to see which carriers are filing pop-up flights. By reviewing
the Pop-Up Report on a consistent basis, it may be possible to identify trends such as
whether a carrier tends to operate the pop-ups it files.
Review the TOD and Cancel Status columns for pop-up flights that are contributing to the
―Rolling Spike Problem‖ by time out delaying or time out cancelling. If a large number of popups are time out cancelling, this may indicate there is a problem with duplicate calls signs or
that some other automation problem is occurring.
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A-9. Time Out Delay Report
The Time Out Delay report lists all flights that are currently in time out delay (see Figure 11).
By default, the Arrival report is displayed. To display the Departure report, click the Time Out
Delay (Departure) link located below the report title.
Figure 11: Time Out Delay Report
The Minutes in TOD column displays the total number of minutes the flight has been in
timeout delay. The Cancel Status column displays whether the flight is currently cancelled
as well as the time at which it was cancelled. If a flight is reinstated it no longer appears as
cancelled in this report.
Note: For airspace elements (i.e., FCAs) Entry time is used
instead of ETA since ETA is not applicable to an airspace element.
The Entry time is the time at which a flight enters an airspace
element’s boundaries.
Note: When sorting by Entry Time for an airspace element (FCA),
the Arrival Hour column header changes to Entry Hour.
Sorting
By default CAMU Web sorts the report by ETA for GDPs and ENTRY for AFPs. Click on any
of the underlined column titles to sort by the selected column.
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Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Exclusions
International flights are excluded from the time out delay flight list.
CAMU Web does not display general aviation and military flights for airline users.
Usage
Flights may timeout delay for a variety of reasons including delays at the departure
aerodrome or airline delays. The AFT system timeout delays a flight if it has not departed
within five minutes of its ETD. The system timeout cancels a flight after ten minutes if it
does not have a Flight Plan ID from the flight data processing system, has not departed
within 10 minutes of its current ETOT and no ATOT value has been set. The AFT system
will also timeout cancel flights after they have been in timeout delay for 90 minutes.
Sort the flight list by ACID to see if a particular carrier has a large number of time-out
delayed flights. Follow-up with the carrier may be necessary to determine if the carrier
intends to operate a flight. A large number of timeout cancelled flights for a single carrier
may indicate that there is a problem with duplicate call signs. Time out delayed flights may
also indicate an airline is not providing current flight information regarding delays. By
reviewing the TOD report on a consistent basis, it may be possible to identify airline or flight
data quality problems.
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A-10. Duplicate Flights Report
By default, the Arrival report is displayed (see Figure 12). To display the Departure report,
click the Duplicate Flights (Departure) link located below the report title. The Duplicate Flights
Report primarily identifies multiple occurrences of a flight that appear in AFT due to data
processing errors, such as flight data mismatches. However, some shuttle flights may also
be flagged as duplicates. The intent of this report is to alert users about flights shown in AFT
that may not operate. This list might show two flights as duplicates even though they are
both legitimate flights, such as the case with shuttle flights. CAMU Web identifies possible
duplicates by looking for flights with the same or similar ACID, origin, destination, initial gate
time of departure (IOBT), and ETA for GDPs, Entry for AFPs. The list is sorted by ACID.
Note: For airspace elements (i.e., FCAs) Entry time is used
instead of ETA since ETA is not applicable to an airspace element.
The Entry time is the time at which a flight enters an airspace
element’s boundaries.
In addition to the existing logic to detect duplicate flights, the following criteria are used:
If two flights have the same ACID, ADEP, ADES, and IOBTs that are within 20
minutes of each other, consider the flights to be duplicates.
If a duplicate pair both has an ETA Prefix of A, remove the pair from the list.
If one of the flights in a duplicate pair is dropped from the arrivals data, do not
add the duplicate pair to the list. If the flight was dropped after being added to
the list, remove the duplicate pair from the list.
These changes were made to better identify ―demand unlikely to materialize.‖
Figure 12: Duplicate Flights Report
Sorting
Click on any of the underlined column titles to sort by the selected column.
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Accessing a Flight’s History
Click on a call sign in the flight list to display all the flight data received through the ADLs for
the flight selected.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
Usage
The Duplicate Flights Report allows the user to easily see demand that might not
materialize. If it appears that one particular carrier has a large number of flights listed, it
could mean that carrier is having a data problem. Like the Time Out Delay report, follow up
with a carrier may be needed to determine if a flight is going to operate or not. Looking at the
SLOT field allows you to see which flights are included in the program.
Exclusions
For airline users, general aviation and military flights are not displayed.
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A-11. Unassigned Slots Report
The Unassigned Slots report displays the number of Unassigned Slots for each hour in 15minute time bins and the total number of unassigned slots for each hour (see Figure 13).
Figure 13: Unassigned Slots Report
Sorting
You cannot sort data for the Unassigned Slots report.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
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A-12. Events Report
All TMI actions executed through AFT are displayed on the Events page including GDP,
AFP, compression, ground stops, and purges (see Figure 14). For each action taken, the
Events Report displays the execution time followed by the event type and the start and end
time for event. The Model Time and Reflect Time for all events also are displayed. The
Model Time is the ADL time displayed in AFT when the event was modelled. The Reflect
Time is the ADL time displayed in AFT when the new control times first appear in the data.
Other parameters may also be listed depending on the event type.
Figure 14: Events Report
For distance-based TMIs several parameters are displayed. Definitions are provided in Table
2.
Table 2: Distanced Based TMI Parameters
Term
Definition
Exempt Distance
The distance specified in the GDP setup panel in nautical miles.
Exempt FIRs
(ADEP/ADES)
Shows any FIRs that fall within the distance specified, that are
exempted from departure delay.
Non Exempt FIRs
(ADEP/ADES)
Shows the FIRs that fall outside of the distance, but are subject to
departure delay.
Exempt
Aerodromes
(ADEP/ADES)
Displays the aerodromes that fall within the distance, but are
exempted from departure delay.
Non Exempt
Aerodromes
(ADEP/ADES)
Shows the aerodromes that are subject to departure delay, that fall
outside of the distance specified.
Aerodrome If
The flights departing from these aerodromes will not be exempted
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Term
Definition
Distance
from departure delay if they fall within the distance range of the
program.
Sorting
You cannot sort data in the Events report.
Viewing in Text Format
To view the report in text format, click the Text Version link that is located below the report
title. Click your browser‘s back button to return to the report in GUI format.
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A-13. Querying the Element Flight List
The Element Flight List feature allows you to query the CAMU Web database for a specific
aerodrome or FCA. To access the query capabilities, complete the following steps:
Click the Element Flight List link in the Reports Links navigation bar found on
the Home page or any page (see Figure 15) and the Element Flight List page is
displayed.
Figure 15: Element Flight List Link
Enter an aerodrome or FCA in the Please Enter the Aerodrome/FCA box. If
you enter an FCA, select the FCA checkbox.
Click Display Flights. The slot list for the entered FCA or aerodrome is displayed
(see Figure 16 and Figure 17).
Figure 16: Slot List for FCA Flight List Query
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Figure 17: Slot List for Aerodrome Flight List Query
You can further filter which flights are displayed by clicking the Display dropdown menu.
The selected default is Arrivals & Departures. Arrivals are flights with the ADES matching
the Element name entered, and Departures are flights with the ADEP matching the Element
name entered. All non-active, non-cancelled arrival and departure flights are displayed.
After the ALDT or ATOT is received, the flight is identified as active and is removed from the
flight list. Arrivals & Departures is not an option for FCAs.
If you select Arrivals, all non-active, non-cancelled arrival flights are displayed. After the
ALDT is received, the flight is identified as active and is removed from the flight list. Arrivals
are the only option for FCAs.
If you select Departures, all non-active, non-cancelled departure flights are displayed. After
the ATOT is received, the flight is identified as active and is removed from the flight list.
Departures is not an option for FCAs.
Displaying Tower View of Flight List
The Tower View checkbox filters the data that is displayed in the slot list. Tower View only
applies to the Arrivals Only and Departures Only views. It does not apply to the Arrivals
and Departures view.
For Arrivals Only flights, the Tower View displays the ACID, ADEP, ETA + Taxi In and ETA
(see Figure 18).
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Figure 18: Arrivals Only Tower View
For Departures Only flights, the Tower View displays the ACID, ADES, ETD-Taxi Out, ETD,
and CTOT (see Figure 19).
Figure 19: Departures Only Tower View
Sorting
To sort the list, click any one of the table headers. For example, click ACID and the table is
sorted in ascending order. Click ACID again, and the table is sorted in descending order.
Suspending Updates
The date and time of the most current update is displayed parenthetically after [name of
aerodrome/FCA] Flight List heading. To prevent the screen from refreshing, select the
Suspend Updates checkbox. The date and timestamp will remain the same and the data
will not update until you unselect the Suspend Updates checkbox.
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Displaying Rows
From the Rows per page dropdown menu, select 50, 100, or 150 to determine how many
rows are displayed per page. The numeric links will display your selected range of 50, 100
or 150.
Use the Rows: line to navigate between the pages and rows. Click first to view the first
page of rows, and click last to view the last page of rows. Click the numeric links, e.g., 51100 to view rows 51 through 100.
Note that only five sequential page links are displayed between <<first and last>>. As you
click the links, the row selection moves sideways.
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A-14. Looking Up Flights
CAMU Web‘s Flight Lookup feature allows you to query the CAMU Web database for flight
information (see Figure 20). To access the query capabilities click the Lookup Flight link in
the Reports Link navigation bar. The query interface is shown in Figure 20.
Figure 20: Lookup Flight Interface
To view the flight history for a particular flight enter the flight's call sign in the ACID field. At a
minimum, the ACID field must contain a value. The remaining flight fields are optional. Once
the search criteria have been entered, click Submit Search Terms. If there is only one
matching flight for the search criteria, CAMU Web displays that flight‘s Flight History report.
If there are multiple matches, CAMU Web displays the query results table.
A multiple flight query may be generated by using an asterisk after the three-letter ID. For
example, to query for all enter the carrier's 3-letter abbreviation and an asterisk (see Figure
21). Then click Submit Search Terms.
Figure 21: Multiple Flight Lookup
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CAMU Web returns a list of flights (see Figure 22). For airline users, general aviation and
military flights are not displayed. Click on the flight‘s ACID to view the ADL records received
for a particular flight.
Figure 22: Multiple Flight Lookup Results
The Flight History is colour-coded to highlight changes in a flight‘s control times identified by
CAMU Web (see Figure 23). Flight records are sorted in ascending order by ADL time. The
―Flight in Other Elements‖ field shows if the current flight is also part of another element‘s
data set; click the element name to view the Flight History report with that element‘s ADL
data for the flight.
Figure 23: Flight History for a Flight Controlled by a GDP Program
Table 3 describes the colour scheme and what each colour represents. The colouring is
applied when an ADL update includes a change to a flight‘s CTOT or CLDT. To view a
definition of each data field, position the mouse pointer over the column header and a
description will pop-up.
Table 3: CAMU Web Flight History Color Scheme
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Color
Description
Brown
CTOT/CLDT changed due to an AFT event (AFP, GDP, Compression,
Ground Stop).
Cyan
CTOT/CLDT changed to an airline substitution or SCS
Dark Gray
Flight is no longer listed in the ADL. If this is the last line in the Flight
History Report, the flight was dropped due to flight data system
issues. If there is a gray line followed by another line, then the flight
temporarily dropped out of the ADL and returned in a later ADL. Note:
This does not apply to flights that drop out in the first ADL of each
hour due to the ADL time roll over.
The flight history for a flight on a prior day may also be viewed by ATNS users. To do so,
select the ―Get past day‖ checkbox and enter the date of interest (see Figure 24). For prior
day lookups, you must enter the destination.
Note: Airline users do not have access to historical flight
lookups.
Figure 24: Flight Lookup Past Days
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A-15. Copying, Saving, and Printing a CAMU Web Report
It is easiest to copy, save, or print a report when using a text version of the report.
Creating a Text Version of a Report
To generate a text version, select the Text Version link below the report title. A text version of
the report is displayed (see Figure 25).
Figure 25: Text Version of Compliance Report
To Copy and Paste the text report
From the browser Edit menu click Select All or alternatively use the shortcut keys CTL-A. To
highlight a portion of the report, left click and drag to highlight the section you want to copy.
Right click the selection.
Select Edit  Copy.
Paste the copied text into a log or any other document.
To Save the text report
From the browser, select File  Save As.
Enter a file name.
Select the location where you want to save the file.
For the Save As Type, select ―Text File (*.txt)‖.
Click Save.
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To Print the text report
From the browser, select File  Print.
Select the printer.
Click OK.
Note: If you try to print a flight history the browser will only print
a single page width. To print all columns of the flight history you
will need to save it as a text file and print from another application
such as Notepad, Word, or Excel.
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A-16. Delegating/Undelegating Control
The CAMU Operator can delegate control to the Aerodrome Operator role. The delegation
will permit the Aerodrome Operator to swap flights until such time that the control is
undelegated. Note that the ability to delegate/undelegate will not be transferred to the
delegated user.
The Aerodrome Operator can perform substitutions only on aerodromes for which both the
Aerodrome Operator and CAMU Operator have permissions. For example, if the CAMU
Operator has permissions for FAJS, FACT and FADN and Aerodrome Operator has viewing
rights to FADN and FAPE, the delegation only allows the Aerodrome Operator substitution
permissions to FADN.
Figure 26: CAMU Operator’s Delegate Button
To delegate control, complete the following steps:
Click the Delegate button located on the orange navigation bar (see Figure 26).
The Delegate button will toggle to Undelegate and the word ―delegate‖ will be
added to the end of the Username in the navigation bar (see Figure 27).
Figure 27: Navigation Bar After Control has Been Delegated
Click Undelegate to regain control from the Aerodrome Operator.
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A-17. Substitution
The Substitution page is the main page where you may suspend flight, swap flight slots, and
update flights‘ ELTOT, ELLDT, and AC_REG. Click the Substitutions link in the Reports
Links navigation bar to access the Substitution page (see Figure 28).
Figure 28: Substitution Page
Updating the Data
To refresh the page with the most current data, click the Update Data button. Note that there
may be a time lapse between when you click Submit and when your updates are reflected.
For example, if you swap some flights, click Submit, and click Update Data, your changes
may not be reflected as they are still being processed. The parenthetical sentence next to
the Update Data button will indicate how long it could take for the changes to be reflected.
Displaying Rows
From the Rows per page dropdown menu, select 50, 100, or 150 to determine how many
rows are displayed per page. The numeric links will display your selected range of 50, 100 or
150.
Use the Rows: line to navigate between the pages and rows. Click first to view the first
page of rows, and click last to view the last page of rows. Click the numeric links, e.g., 51100 to view rows 51 through 100.
Note that only five sequential page links are displayed between <<first and last>>. As you
click the links, the row selection moves sideways.
Suspending Flights
Suspended flights do not retain ownership of the suspended slot. A suspended flight‘s SLOT
will be returned to the Unassigned Slot pool. Once a flight is suspended, the associated
SLOT is then available for any flight to swap into or for a pop-up flight.
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To suspend flights, complete the following steps:
Select the Flight to be suspended.
Click the Suspend Flight button. The flight will be displayed in the Suspended
Flights List at the bottom of the CAMU Web Substitution page (see Figure 29).
Click the Submit button to save your suspension. Upon a successful
suspension, a message is displayed, e.g., Suspension of Flight BAW42
Succeeded.
Figure 29: Suspended Flights Displayed in the Suspended Flights List
Swapping Slots
Swapping can only occur with flights of similar type; you cannot swap between departures
and arrivals. Suspended flights may not be used in swapping.
To swap flights, complete the following steps:
Select a slot be swapped.
Select the second slot to be swapped.
Click the Swap button.
Click the Submit button to send the swap. A message indicating a successful swap will
be displayed, e.g., ―Substitution of Flight AFR282 to Slot 09/2021 and AFR284 to Slot
09/2019 Succeeded.‖
Note: Clicking Update Data does not submit your swap. If you click
Update Data before clicking Submit, the flights will not be swapped.
Updating ELTOT and ELLDT
Updating an ELTOT or ELLDT ensures that during a Revision or Compression, the flight is
not moved up to a time that it cannot achieve. These times are the earliest times the flight
can make.
To update ELTOT or ELLDT complete the following steps:
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Double-click in the ELTOT or ELLDT cell to make edits. A calendar popup
window is displayed (see Figure 30).
Figure 30: Popup Calendar to Edit ELTOT, ELLDT, or AC_REG
Enter the date and time in the following format: DD/HHMM.
Click OK. The slot is updated with the new values.
Updating AC_REG
Users can enter a flight‘s registration number via the CAMU Web substitution interface.
To update AC_REG complete the following steps:
Double-click in the AC_REG cell to make edits. A pop-up text box is displayed (see
Figure 31).
Figure 31: Edit AC_REG Field
Enter the aircraft registration number.
Click OK.
Click Update Data. The flight‘s AC_REG cell is updated with the new value. Note
that you may have to click Update Data more than once (after 27 seconds) to
view the update.
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Appendix A: Questions and Answers
Why does the number of slots not equal the requested Program Rate?
This number of slots may not equal the program rate for several reasons:
Non-Compliant Flights: Flights which have already arrived will not be included in a revision,
even if the slot time assigned to the flight falls within the revision time period. Furthermore,
AFT does not look to see if slot times that fall within the revision time period were previously
assigned to a flight that is not included in the revision. Therefore, it is possible that a slot
time may be associated with multiple flights. The end result is that the number of slots for a
particular hour can exceed the program rate for an hour. To illustrate, consider a flight with a
slot time of 2130 with a 60-minute en-route time. The flight was assigned a CTOT of 2030
but departed an hour early at 1930 and arrived at 2030. A revision is run at 2045 with a start
time of 2045. Because the flight has already arrived it is not included in the revision and will
keep the 2130 slot time assigned to it. Assuming the program rate was 30 RBS++ creates
30 slots for the 2100 hour and creates a new 2130 slot, which is assigned to another flight.
Now two flights have a 2130 slot time. Even though AFT allocated 30 slots in the revision, 31
slots now exist for the 2100 hour.
EDCT Updates: An EDCT update changes the flight‘s slot time; therefore if the slot is moved
to a different hour the number of slots will no longer equal the requested program rate.
Ground Stops: Issuance of an AFT ground stop assigns all flights a CTOT equal to the
ground stop end time + 1 minute. The affected flights slot times will also be updated to the
new CTOT + EET. This may dramatically redistribute slots.
Schedule Composition: Occasionally, AFT will not allocate as many slots as requested if it
cannot assign any flights to an available slot due to the schedule composition. This should
very rarely occur - typically this only happens when the demand does not exceed the
program rate by very much.
Flights Are Dropped: Occasionally, flights get dropped from the ADL due to processing
errors. The number of slots will be reduced by one for each controlled flight that has been
dropped.
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Appendix B: CAMU Web Users Roles
User Role Options
Select one of the following roles (see Table 4 for specific privileges):
CAMU Administrator (camuadmin)
CAMU Operator (camuoper)
Aircraft Operator (aircraftoper)
Aerodrome Operator (dromeoper)
Aerodrome Observer (Read-only access) (dromeobs)
Aerodromes
Enter the aerodromes that the user has access
Majors
Enter the majors that the user has access
Table 4: Role Privileges
Role
CAMU Operator (Superuser)
Privileges
View all flights and slots for a particular controlling
element.
Modify flight data, swap slots between any two flights,
or suspend any flight.
Swap any open slots.
Suspend a flight.
Delegate control to the Aerodrome Operator role.
Aircraft Operator
View own flights and slots for a particular controlling
element.
Swap slots between two of its original flights, or
suspend any of their flights. If the airline is affiliated
with a specific MAJOR, then the AO will be able to
modify the MAJOR‘s flight plus any sub-carrier flights
associated with that MAJOR.
Swap their carrier‘s current slot for an open slot based
on their own schedule.
Cancel or suspend a flight.
Aerodrome Operator
View all controlled flights arriving at/departing from
their associated aerodrome.
Perform all the actions of a CAMU Operator on their
flights, except the ability to delegate control to another
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Role
Privileges
user, when the CAMU Operator has delegated control
to the Aerodrome Operator. The Aerodrome Operator
will not be able to delegate control in any way. This
ability to delegate and un-delegate only resides with
the CAMU Operator.
CANNOT modify flight information when the CAMU
Operator has re-taken control of traffic management.
Once the CAMU Operator has re-taken control, the
Aerodrome Operator‘s permissions will revert to their
original setting.
Perform substitutions only on aerodromes that both
the Aerodrome Operator and CAMU Operator have
permissions for.
Aerodrome Observer
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View all controlled flights arriving at / departing from
their associated aerodrome.
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Appendix C: Acronyms
AC_REG ............. Aircraft Registration
ACID ................... Aircraft Identifier
ADEP .................. Departure Airport
ADES .................. Destination Airport
ADL..................... Aggregate Demand List
AFIR ................... Arrival FIR
AFP..................... Airspace Flow Program
AFT ..................... Airport Flow Tool
ALDT .................. Actual Landing Time
ATNS .................. Air Traffic and Navigational Services
ATOT .................. Actual Take-Off Time
CAMU ................. Central Airspace Management Unit
CDM ................... Collaborative Decision Making
CLDT .................. Controlled Landing Time
COMP ................. Compression
CTL_ELEM ......... Control Element
CTL_Type ........... Control Type
CTOT .................. Calculated Take Off Time
DFIR ................... Departure FIR
EDCT .................. Estimated Departure Clearance Time
EET..................... Estimated En Route Time
ELLDT ................ Earliest Airline Landing Time
ELTOT ................ Earliest Airline Take-Off Time
ETA..................... Estimated Time of Arrival
ETD .................... Estimated Time of Departure
FCA .................... Flow Constrained Area
FIR ...................... Flight Information Region
GAAP.................. General Aviation Airport Program
GDP .................... Ground Delay Program
GS ...................... Ground Stop
GUI ..................... Graphical User Interface
IIBT ..................... Initial In-Block Time
IOBT ................... Initial Off-Block Time
POBT .................. Planned Off-Block Time
RBS .................... Ration By Schedule
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SIBT.................... Scheduled In-Block Time
SOBT .................. Scheduled Off-Block Time
TMI ..................... Traffic Management Initiative
TOD .................... Time Out Delay
UTC .................... Coordinated Universal Time
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Appendix D: Warning and Error Messages
Warnings
Warnings
Identifier
Message
Description
WARN006
FLIGHT NOT FOUND.
Flight does not exist. The message was
ignored.
WARN007
FLIGHT ALREADY
SUSPENDED.
Flight identified in message has already been
canceled in a prior to the message.
Packet Header Errors
Packet Header Errors
Identifier
Message
Description
ERR401
PACKET NOT
PROCESSED.
The packet has not been processed due to
internal GDG error.
ERR402
PACKET ID IS MISSING.
USE LLLDDDDDDDDDD.DD
The packet header line does not include a
packet ID.
ERR403
INVALID PACKET ID. USE
LLLDDDDDDDDDD.DD
The packet ID does not match the specified
syntax.
ERR404
NO MESSAGES IN
PACKET.
The packet contains no messages type.
ERR405
UNKNOWN PACKET CODE.
USE FD OR SS.
The packet contains a code other than FD in
the header line.
ERR406
PACKET CODE LINE
MISSING. USE FD
LLLDDDDDDDDDD.DD
The packet has no header line.
ERR407
UNKNOWN HUB SITE
ARINC ADDRESS. USE QU
BOSCDYA.
The packet was sent to the wrong address.
ERR409
MESSAGE NOT
PROCESSED DUE TO +
ETMS_NAME + INTERNAL
ERROR.
An error occurred while attempting to update
the GDG Flight Database (FDB).
ERR410
INVALID EN ROUTE TIME.
En Route Time may not exceed 18 hours.
Message Validation Errors
Message Validation Errors
Identifier
ERR101
Message
FLIGHT HAS BEEN
COMPLETED.
ATNS/CAMU/00/32
Description
Cannot modify data fields other than the actual
departure and arrival times after a flight has
been completed.
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Message Validation Errors
Identifier
Message
Description
ERR104
CANNOT MODIFY
ASSIGNED ARRIVAL SLOT.
Cannot modify the assigned arrival slot.
ERR108
FLIGHT NOT FOUND.
PROVIDE AIRCRAFT TYPE
TO CREATE.
The flight does not already exist. GDG would
have created it if aircraft type had been
provided on the FM.
ERR110
FOUND ACTIVE FLIGHT
WITH OTHER DEPARTURE
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR111
FOUND ACTIVE FLIGHT
WITH OTHER ARRIVAL
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR112
FOUND FILED FLIGHT
WITH OTHER DEPARTURE
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR113
FOUND FILED FLIGHT
WITH OTHER ARRIVAL
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR114
FOUND CONTROLLED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR115
FOUND CONTROLLED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR116
FOUND AIRL.CREATED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR117
FOUND AIRL.CREATED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR203
FLIGHT HAS BEEN
COMPLETED.
Can't cancel a flight that has already flown.
ERR204
FLIGHT IS ACTIVE.
Can't cancel a flight that is already in the air.
ERR205
FOUND COMPLETED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR206
FOUND COMPLETED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR207
FOUND ACTIVE FLIGHT
WITH OTHER DEPARTURE
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR208
FOUND ACTIVE FLIGHT
WITH OTHER ARRIVAL
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
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Message Validation Errors
Identifier
Message
Description
ERR209
FOUND FILED FLIGHT
WITH OTHER DEPARTURE
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR210
FOUND FILED FLIGHT
WITH OTHER ARRIVAL
AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR211
FOUND CONTROLLED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR212
FOUND CONTROLLED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR213
FOUND AIRL.CREATED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR214
FOUND AIRL.CREATED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR215
FOUND SCHEDULED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR216
FOUND SCHEDULED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR217
FOUND CANCELLED
FLIGHT WITH OTHER
DEPARTURE AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected
ERR218
FOUND CANCELLED
FLIGHT WITH OTHER
ARRIVAL AIRPORT.
Flight identification is ambiguous because data
partially matches an existing flight record.
Message is rejected.
ERR302
UNKNOWN FORMAT FOR
FLIGHT ID.
The flight ID field does not match the specified
syntax.
ERR303
UNKNOWN FORMAT FOR
AIRPORT.
An airport field does not match the specified
syntax.
ERR304
UNKNOWN FORMAT FOR
DEPARTURE AIRPORT.
The departure airport field does not match the
specified syntax.
ERR305
UNKNOWN FORMAT FOR
ARRIVAL AIRPORT.
The arrival airport field does not match the
specified syntax.
ERR306
UNKNOWN AIRPORT.
The specified airport does not exist in the GDG
airport database.
ERR307
FLIGHT
ID/DEPARTURE/ARRIVAL
AIRPORT MISSING.
One of the first three required fields is missing
(cannot tell which one from syntax).
ATNS/CAMU/00/32
Page 108 of 114
VALID FROM 03 MAY 2010
ENHANCED ATFM OPERATOR’S MANUAL
Message Validation Errors
Identifier
Message
Description
ERR308
UTC DEPARTURE
DATE/TIME MISSING.
The required field UTC Departure Date/Time is
missing.
ERR309
INVALID UTC DEPARTURE
DATE/TIME.
The UTC Departure Date/Time contains an
illegal value (e.g., a month greater than 12)
ERR310
UNKNOWN FORMAT FOR
UTC DEPARTURE
DATE/TIME.
The UTC Departure Date/Time field does not
match the specified syntax.
ERR311
AIRCRAFT TYPE MISSING.
An aircraft type field was not provided.
ERR312
RUNWAY DEPARTURE
TIME MISSING.
A runway arrival time was provided without a
runway departure time. These fields must be
provided in pairs.
ERR313
RUNWAY ARRIVAL TIME
MISSING.
A runway departure time was provided without
a runway arrival time. These fields must be
provided in pairs.
ERR314
GATE DEPARTURE TIME
MISSING.
A gate arrival time was provided without a gate
departure time. These fields must be provided
in pairs.
ERR315
GATE ARRIVAL TIME
MISSING.
A gate departure time was provided without a
gate arrival time. These fields must be provided
in pairs.
ERR317
INVALID TIME. USE
DDHHMM.
A time field contains an illegal value (e.g., date
greater than 31).
ERR318
DEPARTURE TIME LATER
THAN ARRIVAL TIME.
A departure time cannot be later than an arrival
time in a matched pair of times (e.g., gate
times).
ERR319
DEPARTURE TIME EQUAL
TO ARRIVAL TIME.
A departure time cannot be equal to an arrival
time in a matched pair of times (e.g., gate
times).
ERR321
DEPARTURE DATE TOO
FAR IN FUTURE.
The departure date is more than 1 day in the
future (this limit is temporary until future flights
are processed.
ERR322
ARRIVAL TIME IN PAST.
Cannot create a flight arriving in the past.
ERR323
FIELD SPECIFIED
MULTIPLE TIMES.
A field has been defined more than once.
ERR324
INVALID FORMAT FOR
AIRCRAFT TYPE.
The aircraft type field does not match the
specified syntax.
ERR325
UNKNOWN AIRCRAFT
TYPE.
The specified aircraft type does not exist in the
GDG database.
ERR326
FLIGHT ID TOO LONG. USE
MAX 8 CHARS.
The Flight ID has more than 8 characters.
ATNS/CAMU/00/32
Page 109 of 114
VALID FROM 03 MAY 2010
ENHANCED ATFM OPERATOR’S MANUAL
Message Validation Errors
Identifier
Message
Description
ERR327
LINE CONTINUATION
CHARACTER MUST BE
LAST FIELD.
The line continuation character must be the last
field in a message. It must also stand apart
from other fields.
ERR398
INVALID CHARACTER.
An unrecognizable character was received in
an FC, FM, or FX message.
ERR399
UNKNOWN SYNTAX
ERROR.
A totally unrecognizable message was
received.
ATNS/CAMU/00/32
Page 110 of 114
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ENHANCED ATFM OPERATOR’S MANUAL
Simplified Substitution Errors
Simplified Substitution Errors
Identifier
Message
Description
ERR 412
ILLEGAL HOLD FLAG
VALUE: USE R OR H.
Valid values for Hold Flag are H to hold slot or
R to release slot.
ERR 413
NOT AUTHORIZED TO SUB
FOR THESE FLIGHTS.
At least one flight in this packet belongs to a
carrier for which the sender is not authorized to
make substitutions at this airport. Sender must
be authorized to submit substitutions for all
flights referenced in an SS packet.
ERR414
CANNOT CANCEL A NONCONTROLLED FLIGHT.
An FX message submitted in an SS packet
must pertain to a controlled flight. A noncontrolled flight may only be cancelled in an FD
packet. The most common cause for this error
is an incorrect flight ID, origin, destination, or
original gate departure date and time.
ERR416
CTA NOT WITHIN 20MINUTE WINDOW.
CTA must be no earlier than the slot time for
the flight's assigned slot, and no more than 20
minutes later than the slot time.
ERR417
CANNOT SUB INTO SLOT
NOT OWNED BY THIS
CARRIER.
The FM message references a slot that does
not currently belong to the sending airline or
one of its authorized affiliates.
ERR418
CANNOT SUB TWO
FLIGHTS IN ONE SLOT.
Packet contains FM messages that assign
more than one flight to the same slot. Only one
flight may be assigned to a slot.
ERR419
CANNOT SUB ONE FLIGHT
IN TWO SLOTS.
Packet contains FM messages that assign a
flight to more than one slot. A flight may be
assigned to only one slot.
ERR420
CANNOT SUB A NONCONTROLLED FLIGHT.
Cannot use an FM message to assign a flight to
a slot if the flight does not already have a slot
assignment. This message is generated if the
flight referenced in an FM does not exist in the
GDG flight database, or if it exists but is not
currently controlled. The most common cause
for this error is an incorrect flight ID, origin,
destination, or original gate departure date and
time.
ERR421
CANNOT CONTROL
FLIGHT SCHEDULED TO
ARRIVE DURING GDP.
An SC message can be used to create a slot
and assign it to a flight only if the flight is
scheduled to arrive after the GDP end time is
over.
ERR422
SLOT NOT OWNED BY
FLIGHT IN THIS PACKET.
In order to preserve the one-flight-one-slot rule,
every slot that is assigned in an SS packet
must be assigned to another flight in that
packet prior to the packet being processed.
ERR423
CANNOT SUB INTO SLOT
OCCUPIED BY FORMER
POPUP FLIGHT.
Flight cannot be assigned to an earlier slot if
the flight currently assigned to that slot was
formerly a popup.
ATNS/CAMU/00/32
Page 111 of 114
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ENHANCED ATFM OPERATOR’S MANUAL
Simplified Substitution Errors
Identifier
Message
Description
ERR424
AIRPORT NOT
CONTROLLED.
A HOLD ALL SLOTS or RELEASE ALL SLOTS
message was received for an airport that does
not currently have a GDP.
ERR425
CANNOT CHANGE HOLD
FLAG FOR NONCONTROLLED FLIGHT.
Cannot modify hold flag for flight that does not
have an assigned slot in a GDP. The most
common cause for this error is an incorrect
flight ID, origin, destination, or original gate
departure date and time.
ERR426
CANNOT SUB POP-UP
FLIGHT.
Cannot assign a popup flight to a slot. Only
compression may assign a popup to a slot,
after which the flight is referred to as a former
popup.
ERR427
CONTROL INFO MISSING.
SPECIFY: DEP.TIME,
ARR.TIME, AND SLOT.
CTD, CTA, and ASLOT fields are required in an
FM message submitted in an SS packet.
ERR428
SLOT TIME CANNOT BE IN
THE PAST.
A flight cannot be assigned to a slot whose slot
time is earlier than the current time.
ERR429
CANNOT SUB COMPLETED
FLIGHT.
Cannot modify slot assignment for a completed
flight.
ERR430
CANNOT SUB MULTIPLE
AIRPORTS.
All messages in an SS packet must pertain to
flights arriving at the same airport.
ERR432
SC CAN BE SENT ONLY IN
SS PACKET.
Slots cannot be created in an FD packet. An
SC message may only be submitted in an SS
packet.
ERR433
CANNOT CREATE SLOT
FOR CONTROLLED
FLIGHT.
Flight referenced in SC message is already
controlled. Cannot use SC message to create a
slot and assign a flight to the newly created slot
if the flight already has an assigned slot or an
FA Delay.
ERR434
SLOT ALREADY EXISTS.
The slot value provided in SC message already
exists. A newly created slot must have a unique
slot identifier. An airline can generally create a
unique identifier by changing the suffix letter in
the slot name.
ERR435
CANNOT USE SIMPLE SUB
MSG AFTER OLD STYLE
SUB MSG.
Until transition to Simplified Substitution
messages is complete, airlines may submit
substitutions using either the new SS
messages or the old SI messages. However,
once an airline has submitted an SI message, it
must continue to use SI messages for the
remainder of that GDP.
ERR436
SLOT IN SC MSG CANNOT
BE DURING CURRENT
GDP.
Slot time for newly created slot falls in the
current GDP timeframe. For an airline to create
a slot, the slot time portion of the Assigned
Arrival Slot field in the SC message must
specify a time that is after the GDP is over.
ATNS/CAMU/00/32
Page 112 of 114
VALID FROM 03 MAY 2010
ENHANCED ATFM OPERATOR’S MANUAL
Simplified Substitution Errors
Identifier
Message
Description
ERR437
ETE CANNOT BE
CHANGED BY MORE THAN
50%.
The new ETE, derived by subtracting CTD from
CTA, cannot change from the prior ETE by
more than 45 minutes or 50% of the prior ETE,
whichever is greater.
ERR438
SUB PROCESSING IS OFF.
Command Center is currently not accepting
substitution messages pertaining to this GDP.
GDG sends an GDG SUBS ON message when
it resumes accepting substitution messages.
ATNS/CAMU/00/32
Page 113 of 114
VALID FROM 03 MAY 2010
ENHANCED ATFM OPERATOR’S MANUAL
Appendix E: Revision History
Version
Date
Updates
Updated By
Approved By
1.0
7/26/2007
Updated for ATNS
AMW
John Suh
2.0
1/28/2010
Updated for ATNS
JS Sullivan
John Suh
2.1
2/12/2010
Added Warning Error and
Messages Appendix
JS Sullivan
John Suh
2.2
3/12/2010
Updated Accessing
Reports, Element Flight List,
and Substitution sections
JS Sullivan
John Suh
ATNS/CAMU/00/32
Page 114 of 114
VALID FROM 03 MAY 2010
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