Garmin | GMA™ 35 | Garmin GMA™ 35 RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System

Garmin GMA™ 35 RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
Log of Revisions
Page
Revision
Number
1
Date
10/21/13
Number
All
Description
Complete Supplement
FAA Approved
Christy Helgeson
Aircraft Certification Office
Federal Aviation Administration
Seattle, WA
2
03/21/16
6
General
•
8
Introduction
•
8
11
Added wires
•
Removed “HTAWS
ALERT ACK” switch
Section 1.7
190-01007-J2 Rev.3
Page 2 of 33
New Section
Section 1.14
New Section
Sections 3.2.1 and 3.2.2
•
14
Modified limitations
Section 1.13
•
14
Modified limitations
Section 1.8
•
12
Added wires
•
•
12
Modified limitation
Section 1.6
•
11
Added definitions
Section 1.5
•
11
New Section
Section 1.3
•
10
Date: 04/04/2016
Added introductory text
Definitions
•
10
ODA STC Unit Administrator
Garmin International, Inc.
ODA-240087-CE
Electronic Checklists
•
8
Updated Table 1
Date: 10/23/2013
Michael Warren
Added wire alerts
Sections 3.2.4
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
•
18
Pilot’s Guide
•
21
22
•
Added wire depiction and
wire alerts
•
Added grouped obstacle
depiction
HTAWS
26
•
Added wire database
coverage
•
Added Canada to obstacle
coverage area
Airspace Depiction
Moved Map Orientation
content to new section 7.19
26
New Sections:
• New section: Fuel Range
Rings
27
•
New section: Depiction of
Obstacles and Wires
28
•
New section: Map Page
29
•
New section: User Defined
Waypoints
29
•
29
12/19/18
Added note
Databases
•
3
Added wires alerts
HTAWS Inhibit
•
25
Added wires
HTAWS RP Mode
•
23
Updated Pilot Guide
revision levels
Terrain Proximity
•
23
Section now contains
procedure for loss of GPS
navigation. Other sections
moved down.
9
9
New section: Times and
Distances
• New section: GTN-GTN
Crossfill
Added Terrain Alerting to
Section 1.2
Added Section 1.4
HTAWS/Terrain Alerting
9
Updated Section 1.5
11
Updated SW version to v6.51
in Section 2.2
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
See Page 1
190-01007-J2 Rev. 3
Page 3 of 33
13
Added Section 2.15 Charts
Database
14
Added Section 2.16 OBS Mode
14
15
18
18
18
18
20
23
26
30
31
31
32
32
33
190-01007-J2 Rev.3
Page 4 of 33
Added Section 2.17 Advisory
Visual Approaches
Added Section 3.5 Cold
Weather Compensation
Reworded Section 4.2.8
Added Section 4.2.9 In-Air
Restart of GTN
Added Section 4.2.10 BaroALT Input Failure
Added Section 4.2.11
Temperature Input Failure
Updated Pilot’s Guide revisions
in Section 7.1
Added Terrain Alerting to
Section 7.6
Added text about database
expiration dates to Section 7.9
Updated text for enabling
crossfill for Section 7.21
Added Section 7.22 European
Visual Reporting Points
Added Section 7.23 Advisory
Visual Approaches
Added Section 7.24 Descent
VNAV
Added Section 7.25 Along
Track Waypoints
Added Section 7.26 Database
Provided Altitudes
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
Table of Contents
SECTION
PAGE
GENERAL ..............................................................................7
SECTION 1
1.1
Garmin GTN Navigators ...................................................................7
1.2
Capabilities ........................................................................................9
1.3
Electronic Checklists .........................................................................9
1.4
HTAWS/Terrain Alerting..................................................................9
1.5
Definitions .........................................................................................9
SECTION 2
LIMITATIONS ....................................................................11
2.1
Kinds of Operation ..........................................................................11
2.2
Applicable System Software ...........................................................11
2.3
SD/Database Card ...........................................................................11
2.4
Ground Operations ..........................................................................11
2.5
Terrain Proximity Function (All Units) ...........................................11
2.6
HTAWS Function (Optional) ..........................................................12
2.7
Data Link Weather Display (Optional) ...........................................12
2.8
Traffic Display (Optional) ...............................................................13
2.9
Flight Planner/Calculator Functions ................................................13
2.10 Glove Use / Covered Fingers ..........................................................13
2.11 Demo Mode .....................................................................................13
2.12 Telephone Audio .............................................................................13
2.13 Polar Operations ..............................................................................13
2.14 Fuel Range Rings ............................................................................13
2.15 Charts Database (Dual GTN 7XXs) ................................................13
2.16 OBS Mode .......................................................................................14
2.17 Advisory Visual Approaches...........................................................14
SECTION 3
NORMAL PROCEDURES .................................................14
3.1
Unit Power On.................................................................................14
3.2
Before Takeoff ................................................................................14
3.3
Telephone & SMS Text (Optional) .................................................14
3.4
HTAWS Inhibit ...............................................................................14
3.5
Cold Weather Compensation...........................................................15
SECTION 4
EMERGENCY / MALFUNCTION PROCEDURES .......16
4.1
Emergency Procedure......................................................................16
4.2
Abnormal Procedures ......................................................................16
SECTION 5
PERFORMANCE ................................................................19
SECTION 6
WEIGHT AND BALANCE.................................................19
SECTION 7
SYSTEM DESCRIPTIONS ................................................20
7.1
Pilot’s Guide....................................................................................20
7.2
Power...............................................................................................20
7.3
Lighting Controls ............................................................................20
7.4
GMA 35 Audio Panel (Optional) ....................................................20
7.5
TERRAIN PROXIMITY ................................................................22
7.6
HTAWS and Terrain Alerting .........................................................23
7.7
Traffic System (Optional) ...............................................................25
7.8
Data Links (Optional)......................................................................26
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 5 of 33
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
7.20
7.21
7.22
7.23
7.24
7.25
7.26
Databases ........................................................................................ 26
External Switches ........................................................................... 26
Airspace Depiction and Alerts ........................................................ 27
Fuel Planning Page ......................................................................... 27
Fuel Range Rings ........................................................................... 27
Charts (Optional) ............................................................................ 28
Transponder Control (Optional) ..................................................... 28
Telephone Audio (Optional) ........................................................... 28
Depiction of Obstacles and Wires .................................................. 28
Map Page ........................................................................................ 29
User Defined Waypoints ................................................................ 30
Times and Distances ....................................................................... 30
GTN-GTN Crossfill........................................................................ 30
European Visual Reporting Points.................................................. 31
Advisory Visual Approaches .......................................................... 31
Descent VNAV ............................................................................... 32
Along Track Waypoints.................................................................. 32
Database Provided Altitudes........................................................... 33
190-01007-J2 Rev.3
Page 6 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
SECTION 1 GENERAL
1.1 Garmin GTN Navigators
The Garmin GTN navigation system is a GPS system with a Satellite-Based
Augmentation System (SBAS), comprised of one or more Garmin TSO-C146c
GTN 625, 635, 650, 725, or 750 navigator(s) and one or more Garmin-approved
GPS/SBAS antenna(s).
GTN 750
GTN 725
GTN 650
GTN 635
GTN 625
GTN system functions are shown in Table 1.
GPS SBAS Navigation
X
X
X
X
X
VHF Com Radio, 118.00 to 136.990, MHz, 8.33 or 25 kHz
X
X
X
increments
VHF Nav Radio, 108.00 to 117.95 MHz, 50 kHz increments
X
X
LOC and Glideslope non-precision and precision approach
X
X
guidance, 328.6 to 335.4 MHz tuning range
Moving map including topographic, terrain, aviation, and
X
X
X
X
X
geopolitical data
Display of datalink weather products, SiriusXM, FIS-B,
X
X
X
X
X
Connext ( all optional)
Display of terminal procedures data (optional)
X
X
Display of traffic data including ADS-B (optional)
X
X
X
X
X
Display of marker beacon annunciators (optional)
X*
X*
X*
X
X
Remote audio panel control (optional)
X
X
Remote transponder control (optional)
X
X
X
X
X
Remote audio entertainment datalink control (optional
X
X
X
X
X
TSO-C194 HTAWS (optional)
X
X
X
X
X
Supplemental calculators and timers
X
X
X
X
X
Control of GSR 56 Iridium Satellite Phone and SMS Text
X
X
X
X
X
(optional)
* Display of marker beacon annunciations on the GTN 6XX is only possible when installed with a
Garmin GMA 350 audio panel.
Table 1 – GTN Functions
The GPS navigation functions and optional VHF communication and navigation
radio functions are operated by dedicated hard keys, a dual concentric rotary
knob, or the touchscreen.
The GTN requires a reasonable degree of familiarity to avoid becoming too
engrossed at the expense of basic see-and-avoid in VMC. Garmin provides
training tools with the Pilot’s Guide and PC based simulator. Pilots should take
full advantage of these training tools to enhance system familiarization.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 7 of 33
Figure 1 - GTN 750 Control and Display Layout
Figure 2 - GTN 635/650 Control and Display Layout
190-01007-J2 Rev.3
Page 8 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
1.2 Capabilities
This Flight Manual Supplement documents the installed capabilities of the GTN
specific to the aircraft for which this manual is created.
NOTE
In sections that contain a square checkbox (□) the installer
will have placed an “X” in the boxes next to the capabilities
applicable to the installation.
The following GTN equipment is installed in this aircraft:
 GTN 750
 GTN 725
 GTN 650
 GTN 635
 GTN 625
The GTN system and associated navigation interface in this aircraft have the
following capability, in addition to the core GPS navigation and display
capability:
 VHF Communication Radio
 VHF Navigation
 HTAWS (TSO-C194)
 Terrain Alerting (Non-TSO-C194)
1.3 Electronic Checklists
The GTN checklist functions are designed to DO-178B software Design
Assurance Level B and the system supports a minor failure classification. While
this STC does not grant operational approval for operators requiring such, there
are no limitations precluding operators from obtaining their own operational
approval for the checklist function.
1.4 HTAWS/Terrain Alerting
The GTN provides two types of terrain alerting functionality: a TSO-C194
compliant HTAWS function and a non-TSO-C194 Terrain Alerting function.
HTAWS and Terrain Alerting are functionally equivalent and are both referred
to as HTAWS in this document.
1.5 Definitions
The following terminology is used within this document:
ADS-B:
Automatic Dependent Surveillance Broadcast
ATK:
Along Track Waypoint
EFB:
Electronic Flight Bag
FIS-B:
Flight Information Services Broadcast
GNSS:
Global Navigation Satellite System
GPA:
Glidepath Angle
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 9 of 33
GPS:
GTN:
HOT:
HTAWS:
IFR:
IMC:
LOC:
NOTAM:
RMT:
SBAS:
SD:
TAS:
TCAS:
TCH:
TFR:
TIS:
VCO:
VHF:
VFR:
VGSI:
VMC:
VNAV:
VRP:
VTF:
XFR:
190-01007-J2 Rev.3
Page 10 of 33
Global Positioning System
Garmin Touchscreen Navigator
Hazardous Obstacle Transmission lines
Helicopter Terrain Awareness and Warning System
Instrument Flight Rules
Instrument Meteorological Conditions
Localizer
Notice to Airmen
Remote
Satellite Based Augmentation System
Secure Digital
Traffic Awareness System
Traffic Collision Avoidance System
Threshold Crossing Height
Temporary Flight Restriction
Traffic Information Service
Voice Call Out
Very High Frequency
Visual Flight Rules
Visual Glideslope Indicator
Visual Meteorological Conditions
Vertical Navigation
Visual Reference Point
Vectors to Final
Transfer
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
SECTION 2 LIMITATIONS
2.1 Kinds of Operation
This model helicopter shall only be operated under VFR conditions in
accordance with 14 Code of Federal Regulations Part 91 and/or Part 135. This
RFM supplement does not grant approval for IFR operations to aircraft limited
to VFR operations.
2.2 Applicable System Software
The following or later software versions must be installed for this RFMS
revision to be applicable to the installation:
Software Item
Main SW Version
Software Version
6.51
Table 2 - Software Versions
NOTE
This section is not intended to be a comprehensive list of
approved software. It is intended to provide a means to
determine if this RFMS revision is applicable to the software
that is installed in the rotorcraft. Do not use this RFMS
revision if the installation has a software version less than that
shown in the table above.
2.3 SD/Database Card
It is required that the SD/database card be present in the unit at all times. The
card must not be removed or inserted during flight and/or while the GTN is
powered on.
NOTE
Removal of the SD card will result in certain features/
databases being unavailable and/or slow system performance.
2.4 Ground Operations
SafeTaxi or Chartview functions shall not be used as the sole basis for ground
maneuvering.
SafeTaxi and Chartview functions do not comply with the requirements of
AC 20-159 and are not qualified to be used as an airport moving map display
(AMMD). SafeTaxi and Chartview may be used by the flight crew to orient
themselves on the airport surface to improve flight crew situational awareness
during ground operations.
2.5 Terrain Proximity Function (All Units)
Aircraft maneuvers and navigation shall not be predicated upon the use of the
terrain display.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
190-01007-J2 Rev. 3
FAA APPROVED
Page 11 of 33
The terrain display is intended to assist the pilot with maintaining awareness of
the proximity of terrain, obstacles, and wires to the rotorcraft. By itself, the
terrain display may not provide either the accuracy or the fidelity on which to
base decisions and plan maneuvers to avoid terrain, obstacles, or wires.
2.6 HTAWS Function (Optional)
HTAWS shall not be used for navigation purposes.
HTAWS shall only be inhibited when in visual contact with terrain and when
the pilot can be assured of maintaining clearance from terrain, obstacles, and
wires.
RP Mode shall only be used when in visual contact with terrain.
External HTAWS annunciators installed in the aircraft shall be fully functional
in order to use the HTAWS system.
NOTE
Terrain Proximity and HTAWS are separate features and
mutually exclusive. If “HTAWS” is shown on the bottomright of the dedicated Terrain page, then HTAWS is
installed.
2.7 Data Link Weather Display (Optional)
This limitation applies to data link weather products from SiriusXM via a GDL
69/69A and Connext via a GSR 56.
Data link weather information shall not be used for maneuvering in, near, or
around areas of hazardous weather.
The indicated data link weather product age shall not be used to determine the
age of the weather information shown by the data link weather product.
Information provided by data link weather products may not accurately depict
current weather conditions. Due to time delays inherent in gathering and
processing weather data for data link transmission, the weather information
shown by the data link weather product may be significantly older than the
indicated weather product age.
Data link services shall not be the sole means used to obtain Temporary Flight
Restriction (TFR) or Notice to Airmen (NOTAM) information. Not all TFRs
and NOTAMS may be available on the GTN.
Data link text weather is decoded for the convenience of the pilot; however, it is
possible that the decoding may be affected by anomalies in the data or
differences in the units of measure between the decoding system and the text
weather source. All text weather displayed on the GTN also includes the raw
weather text for pilot review.
190-01007-J2 Rev.3
Page 12 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
2.8 Traffic Display (Optional)
The display of traffic is an aid to visual acquisition and shall not be utilized for
aircraft maneuvering.
Traffic is displayed in feet regardless of the unit settings for altitude. If the units
for altitude are different than feet, a “FT” label will appear on the traffic icon on
and main Map page, and the dedicated Traffic page will include an “ALT IN
FT” notification.
2.9 Flight Planner/Calculator Functions
The Fuel Planning page shall not be used to determine actual fuel on board the
aircraft.
2.10 Glove Use / Covered Fingers
No article shall cover fingers used to operate the GTN unless the Glove
Qualification Procedure located in the Pilot’s Guide/Cockpit Reference Guide
has been successfully completed. The Glove Qualification Procedure is specific
to a pilot/glove/GTN 725, 750 or GTN 625, 635, 650 combination.
2.11 Demo Mode
Demo mode shall not be used in flight under any circumstances.
2.12 Telephone Audio
Telephone audio shall not be turned on to the pilot or co-pilot unless a phone
call is active.
Failure to turn off telephone audio when the telephone is not in use may result in
telephone ringer or text message aural notifications being received during
critical phases of flight.
2.13 Polar Operations
Operating the GTN for primary navigation for latitudes above 89.00° N and
below 89.00° S is prohibited.
2.14 Fuel Range Rings
The fuel range rings displayed on the moving map are intended for situational
awareness and shall not be used as the means to determine the range of the
aircraft.
2.15 Charts Database (Dual GTN 7XXs)
When the rotorcraft installation includes two GTNs capable of displaying charts
(i.e., GTN 700, 725, or 750) and crossfill is enabled between the GTNs, the
GTNs must have identical charts types (i.e., ChartView or FliteCharts) and
charts cycles installed. Failure to have identical charts could affect the chart
lookup features and automatic chart selection.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 13 of 33
2.16 OBS Mode
Use of OBS mode for flight plan segments greater than 250NM is prohibited.
OBS mode is not available between the FAF and MAP of any instrument
approach.
2.17 Advisory Visual Approaches
Advisory visual approaches are intended to be used as an aid to situational
awareness and do not guarantee terrain or obstruction clearance along the
approach path.
SECTION 3 NORMAL PROCEDURES
Refer to the Cockpit Reference Guide or the Pilot’s Guide defined in Section 7
of this document for normal operating procedures and a complete list of system
messages and associated flight crew actions. This includes all GPS operations,
VHF communication and navigation, traffic, data link weather, HTAWS, and
multi-function display information.
3.1 Unit Power On
Database ................................................................................. REVIEW DATES
Self-Test ....................................VERIFY OUTPUTS TO NAV INDICATORS
Self-Test ‒ HTAWS Remote Annunciator:
HTAWS (Red) ................................................................... ILLUMINATED
HTAWS (Yellow) .............................................................. ILLUMINATED
HTAWS N/A (Yellow) ...................................................... ILLUMINATED
AURAL MESSAGE ..................................................... VERIFY VOLUME
Self-Test – HTAWS Annunciator on G500H (if installed):
HTAWS TEST ................................................................... ILLUMINATED
3.2 Before Takeoff
System Messages and Annunciators ............................................ CONSIDERED
3.3 Telephone & SMS Text (Optional)
Audio from the GSR 56 Iridium data link is routed through the aircraft’s audio
panel. The primary indications of an incoming phone call or SMS text are the
visual indications on the GTN.
3.4 HTAWS Inhibit
The HTAWS functions may be inhibited to prevent alerting, if desired. Refer to
GTN Cockpit Reference Guide for additional information. When HTAWS is
inhibited, all HTAWS aural and visual alerting is suppressed, but VCOs remain
available. HTAWS shall be only inhibited when in visual contact with terrain
and when the pilot can be assured of maintaining clearance from terrain and
obstacles.
To Inhibit HTAWS:
Home hard key ............................................................................................PRESS
190-01007-J2 Rev.3
Page 14 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
Terrain button ............................................................................................. PRESS
Menu button ................................................................................................ PRESS
HTAWS Inhibit button .................................................... PRESS TO ACTIVATE
3.5 Cold Weather Compensation
The GTN can compute altitudes for cold weather compensation for applicable
approach procedures. If the instrument approach chart requires temperature
compensation, the pilot should enter the destination airport temperature into the
GTN. Approach altitudes provided on the map and flight plan are adjusted based
on the pilot-entered temperature and the altitudes on the Flight Plan page are
appended with a snowflake.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 15 of 33
SECTION 4 EMERGENCY / MALFUNCTION PROCEDURES
4.1 Emergency Procedure
No change.
4.2 Abnormal Procedures
4.2.1 HTAWS WARNING
Red annunciator and aural “TERRAIN”, “OBSTACLE”, or “WIRE”:
Aircraft Controls ......................................... INITIATE ESCAPE MANUEVER
4.2.2 HTAWS CAUTION
Yellow annunciator and aural “TERRAIN”, “OBSTACLE”, or “WIRE”:
VERIFY THE AIRCRAFT FLIGHT PATH
AND CORRECT, IF REQUIRED.
NOTE
TAWS annunciators external to the GTN may not indicate
the exact threat causing the alert. Example: WIRE alerts may
be annunciated as “TERR” or “OBSTACLE” on external
devices.
4.2.3 HTAWS N/A and HTAWS FAIL
If the amber external “HTAWS N/A” status annunciator is displayed, the system
will no longer provide HTAWS alerting or display relative terrain and obstacle
elevations. The crew must operate the aircraft in a manner to ensure minimum
safe terrain and obstacle separation.
4.2.4 LOSS OF GPS/SBAS NAVIGATION DATA
When the GPS/SBAS receiver is inoperative or GPS navigation information is
not available or invalid, the GTN will enter one of two modes: Dead Reckoning
mode (DR) or Loss Of Integrity mode (LOI). The mode is indicated on the GTN
by an amber “DR” or “LOI”.
If the Loss Of Integrity annunciation is displayed, revert to an alternate means of
navigation appropriate to the route and phase of flight.
If the Dead Reckoning annunciation is displayed, the map will continue to be
displayed with an amber ‘DR’ overwriting the ownship icon. Course guidance
will be removed on the CDI. Aircraft position will be based upon the last valid
GPS position, then estimated by Dead Reckoning methods. Changes in true
airspeed, altitude, heading, or winds aloft can affect the estimated position
substantially. Dead Reckoning is only available in En Route and Oceanic
modes. Terminal and Approach modes do not support Dead Reckoning.
190-01007-J2 Rev.3
Page 16 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) Are
Available:
Navigation ........................................................ USE ALTERNATE SOURCES
NOTE
All information derived from GPS will be removed.
NOTE
The airplane symbol is removed from all maps. The map will
remain centered at the last known position. “NO GPS
POSITION” will be annunciated in the center of the map.
4.2.5 LOSS OF COM RADIO TUNING FUNCTIONS
If alternate COM is available:
Communications ........................................................ USE ALTERNATE COM
If no alternate COM is available:
GTN VOLUME KNOB ....................... PRESS AND HOLD FOR 2 SECONDS
OR
COM Remote Transfer Button ........... PRESS AND HOLD FOR 2 SECONDS
NOTE
This procedure will tune the active COM radio to the
emergency frequency, 121.5, regardless of what frequency is
displayed on the GTN. Certain failures of the tuning system
will automatically tune 121.5 without flight crew action.
4.2.6 LOSS OF AUDIO PANEL FUNCTIONS (GMA 35 Only)
Audio Panel Circuit Breaker ........................................................................ PULL
NOTE
This procedure will force the audio panel into fail safe mode,
which provides only the pilot with communications and only
on a single COM radio. If any non-GTN 750 COM is
installed, communication will be only on that radio. If only a
GTN 750 is installed in the aircraft, then the pilot will have
only the GTN 750 COM available. No other audio panel
functions including the crew and passenger intercom will
function.
4.2.7 DATA SOURCE - HEADING SOURCE INOPERATIVE OR
CONNECTION TO GTN LOST MESSAGE
Without a heading source to the GTN, the following system limitations will be
imposed:
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 17 of 33
•
•
Map cannot be oriented to Heading Up.
Overlaying traffic data from a TAS/TCAS I will not be displayed on
the main map display. The flight crew must use the dedicated Traffic
page on the GTN system to display TAS/TCAS I traffic data.
4.2.8 DATA SOURCE – PRESSURE ALTITUDE SOURCE
INOPERATIVE OR CONNECTION TO GTN LOST MESSAGE
If the GTN is being used to forward pressure altitude to a transponder, the
transponder will not be receiving pressure altitude from the GTN while that
message is present.
4.2.9 In-Air Restart of GTN
In the event of a GTN restart in the air, the crew should utilize the CANCEL
button if presented with the database update screen after the GTN is restarted.
This will ensure restoration of the navigation functions as soon as possible.
4.2.10 BARO-ALT Input Failure
Barometric altitude is required for descent VNAV functionality and automatic
sequencing of altitude terminated legs. If BARO altitude input to the GTN has
failed, en route barometric VNAV will not be available. The pilot will also be
required to manually sequence any altitude terminated legs.
4.2.11 Temperature Input Failure
Temperature input is required for the VNAV Transition to Approach
functionality. In the event of a temperature input failure, VNAV Transition to
Approach should be disregarded. The crew must ensure that vertical guidance
from descent VNAV to approach guidance is appropriate and that if an autopilot
is in use, the crew intercepts the approach vertical guidance from below.
190-01007-J2 Rev.3
Page 18 of 33
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
SECTION 5
No change.
PERFORMANCE
SECTION 6 WEIGHT AND BALANCE
See current weight and balance data.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
FAA APPROVED
190-01007-J2 Rev. 3
Page 19 of 33
SECTION 7 SYSTEM DESCRIPTIONS
7.1 Pilot’s Guide
The Garmin GTN 6XX or 7XX Pilot’s Guides, part numbers, and revisions
listed below contain additional information regarding GTN system description,
control, and function. The pilot’s guides do not need to be immediately
available to the flight crew.
GTN 6XX Pilot’s Guide
GTN 7XX Pilot’s Guide
P/N 190-01004-03 Rev N or later
P/N 190-01007-03 Rev Q or later
7.2 Power
Power to the GTN is provided through a circuit breaker labeled GPS or
NAV/GPS. If more than one GPS or NAV is installed, then the label will have a
1 or 2 to designate the unit receiving power.
Power to the optional GTN COM is provided through a circuit breaker labeled
“COM”. If more than one COM is installed, then the label will also have a
number to designate the unit receiving power.
Power to the optional GMA 35 is provided through a circuit breaker labeled
“AUDIO”.
7.3 Lighting Controls
Control of the GTN backlight and bezel may be provided by either the built-in
photocell or via the aircraft instrument dimmer switch. For this installation
dimming of the GTN is controlled by:
 The GTN photocell.
 The aircraft instrument dimmer switch.
If installed, the external HTAWS annunciators are connected to the dimmer bus
in the same manner as the aircraft annunciators. The HTAWS WARN/
CAUTION annunciator can be operated at two fixed brightness levels as
controlled by the aircraft BRIGHT/DIM switch. The HTAWS availability
annunciator is controlled by the aircraft instrument dimmer switch.
7.4 GMA 35 Audio Panel (Optional)
The GTN 725/750 can interface to a GMA 35 remotely mounted audio panel
and marker beacon receiver. Controls for listening to various radios, clearance
playback control, and marker beacon are accessed by pressing the Audio Panel
button on the GTN display screen. Volume controls for the audio panel,
telephone, and music are accessed by pressing the Intercom button on the GTN
display screen.
If an optional GSR 56 is installed, when an incoming phone call is received it is
necessary to turn on the telephone audio to desired recipients. Press the
Intercom button on the GTN display screen, press the Telephone button, and
then press the buttons for those who will participate in the call. Telephone
volume can be adjusted using the controls on this page. Upon completion of the
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RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
call, turn off the telephone audio by pressing the Intercom button on the GTN
display screen, then pressing the Telephone button, and then turning off each
participant. Telephone volume settings control both the in call volume as well as
the ringer volume.
The GMA 35 Audio Panel can be controlled using active speech recognition
(ASR) by pressing the Push-To-Command (PTC) switch installed on the cyclic
and speaking a valid command. When a command is recognized, a positive tone
will be provided. When the command is not recognized a negative tone will be
provided.
ASR functions shall not be used while the GTN start-up and self-test screens are
displayed because commands will be queued then executed sequentially when
the GTN enters Normal mode. The following commands can be utilized with the
GMA 35 Audio Panel in this installation:
COMMAND
RESULT
COM
“COM one”
Toggles COM1 audio
“MIC one”
Selects MIC1/COM1 audio
“COM one MIC”
Selects MIC1/COM1 audio
“COM two”
Toggles COM2 audio
“MIC two”
Selects MIC2/COM2 audio
“COM two MIC”
Selects MIC2/COM2 audio
“Split COM” OR "Split Mode"
Toggles split COM mode
NAV
“NAV one”
Toggles NAV1 audio.
“NAV two”
Toggles NAV2 audio.
COM Clearance Recorder
“Play” OR “Read back” OR “Say
again”
Opens Audio Clearance Recorder and
plays the last received radio transmission
Volume Adjustments
“(Desired selection*) volume up”
Increases volume of desired selection.
“(Desired selection*) volume
down”
Decreases volume of desired selection.
“(Desired selection*) volume”
Displays the current volume but does not
change it.
* Desired selection: “pilot”, “copilot”, “passenger”, or “pass”
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NOTE: Finer volume adjustment may be made using the volume knob on the
GTN 7XX. The voice command “Up” or “Down” is equivalent to five clicks of
the Volume knob.
The GMA 35 can operate in split mode, which allows the pilot to communicate
on one COM while the co-pilot simultaneously communicates on a second
COM. When split mode is activated intercom distribution between pilot,
co-pilot, and passengers is turned off. Upon exiting split mode, intercom
distribution is restored to the settings active prior to entering split mode.
7.5 TERRAIN PROXIMITY
Terrain Proximity refers to the display of terrain information and comprises of a
two-dimensional picture of the surrounding terrain and obstacles relative to the
position and altitude of the rotorcraft; however, it does not provide any alerts.
Relative terrain elevation is depicted using a five-color scale in which terrain
that is at or above the helicopter’s current altitude is depicted in orange and red,
while terrain within 250 feet of the helicopter’s current altitude is shown in
yellow.
Obstacles (including wire segments) on the dedicated Terrain page or main map
are depicted in the following manner:
• Lines and obstacles more than 500 feet below the helicopter are not
depicted
• Lines and obstacles between 500 feet and 250 feet below the helicopter
are depicted as white
• Lines and obstacles between 250 feet below and at the same GPS
altitude of the helicopter are depicted as amber
• Lines and obstacles at the same altitude or above the helicopter are
depicted as red
CAUTION
Due to the length of wires and removal of any line more than
500 feet below the aircraft, it is expected that long wires will
appear/disappear in segments as the aircraft transitions above/
below a relative altitude of 500 feet above the wire.
The Terrain page scale depicts the terrain scale but does not depict the obstacle
scale.
CAUTION
Not all obstacles and wires are contained in the Obstacle/HOT
database. The system provides depiction only for obstacles
and wires contained in the database. Alerts are only provided
for obstacles and wires contained in the database if HTAWS is
installed.
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NOTE
Terrain Proximity and HTAWS are separate features. If
“HTAWS” is shown on the bottom-right of the dedicated
Terrain page, then HTAWS is installed.
Multiple obstacles may be depicted using a single obstacle icon and an asterisk
to indicate obstacle grouping is occurring. The color of the asterisk indicates the
relative altitude of the tallest obstacle in the group. The asterisk does not
indicate any information about the relative altitude or number of obstacles not
being displayed in the group.
The Garmin GTN 6XX or 7XX Cockpit Reference Guide or Garmin GTN 6XX
or 7XX Pilot’s Guide provides additional information regarding terrain and
obstacle colors and grouped obstacle icons.
7.6 HTAWS and Terrain Alerting
The GTN can include an optional Helicopter Terrain Awareness and Warning
System (HTAWS) that includes visual depictions of terrain and obstacles
relative to helicopter altitude as well as visual and aural alerts if terrain or
obstacles are a threat to the safe flight of the helicopter. The GTN can also
provide Terrain Proximity without alerts or Terrain Alerting with alerts.
 This installation provides Terrain Proximity. No aural or visual alerts
for terrain or obstacles are provided.
 This installation provides Terrain Alerting. Aural and visual alerts are
provided. Terrain Alerting does not meet the requirements of TSOC194.
 This installation provides HTAWS. Aural and visual alerts will be
provided.
HTAWS is an alerting system. The system does not guarantee successful
recovery from a conflict due to factors such as pilot response, aircraft
performance, and database limitations. No standardized recovery technique is
defined as recovery maneuvers may vary. HTAWS protection is provided at
groundspeeds above 30 knots.
The Obstacle Database contains only known obstacles and wires and does not
contain all existing obstacles or wires that may pose a threat to the helicopter.
HTAWS aurals may be selected to be in Male or Female voice. Selecting the
voice gender is accomplished using the Audio button under the Systems page.
HTAWS also includes pilot selectable Voice Callouts (VCOs) of helicopter
height above terrain from 500 feet AGL to the surface.
If HTAWS is not installed, then the GTN will provide Terrain Proximity
functions that only provide visual depictions of terrain and obstacles on the map
page, but do not provide alerting or VCOs.
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7.6.1 TERRAIN AND OBSTACLE DEPICTION
Terrain and obstacle elevations relative to aircraft altitude are depicted on the
Terrain page and may also be selected by the pilot for display on the Map page.
Refer to Section 7.5 for additional information on terrain, obstacle, and wire
depiction.
7.6.2 HTAWS NORMAL MODE
The GTN will power on with HTAWS in Normal mode. Normal mode provides
for separation from terrain and obstacles appropriate for en route, night, and
operations where the pilot is not in visual contact with terrain.
7.6.3 HTAWS REDUCED PROTECTION MODE
The “RP MODE” menu selection on the Terrain page is used to activate the
Reduced Protection (RP) functionality. RP mode reduces alerting thresholds
and suppresses aural and visual cautions to allow operation in closer proximity
to terrain, obstacles, and wires while continuing to provide protection from
terrain and obstacles. An optional “RP MODE” external switch installation on
the instrument panel or avionics console is allowed to toggle Reduced Protection
mode in the same manner as using the Terrain Menu selection.
7.6.4 HTAWS INHIBIT
The INHIBIT menu on the Terrain page is used to inhibit visual and aural
HTAWS terrain, obstacle, and wire alerts. VCOs will still be provided. HTAWS
shall only be inhibited if the pilot is certain of the ability to maintain separation
from terrain and obstacles.
NOTE
Operators wishing to intentionally fly beneath wires without
creating wire alerts must inhibit HTAWS.
7.6.5 HTAWS TEST
The “HTAWS TEST” menu selection on the Terrain page is used to activate a
manual test that verifies proper operation of the aural and visual annunciations
of the system. The aural message “HTAWS System Test, OK” is played if the
system passes the test; if the system fails, the test “HTAWS System Failure” is
played. HTAWS test is only available while on the ground.
7.6.6 VOICE CALL OUTS
Voice callouts (VCOs) provide voice annunciation of the aircraft height above
terrain when that altitude is descended through. VCOs may be enabled by the
pilot in 100-foot increments from 500 feet above ground level to the surface. If a
radar altimeter is interfaced with the GTN, then VCOs are provided based on
radar altitude and an additional VCO is provided at 50 feet above ground. If no
radar altimeter is interfaced with the GTN, then VCOs are provided based on
GPS altitude above terrain and no 50-foot call is available. Selecting the altitude
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RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
above ground at which VCOs begin is accomplished using the Audio button
under the Systems page.
7.6.7 ALERT ACKNOWLEGE
The Alert Acknowledge function is used to mute an active HTAWS Caution or
Warning when operating in RP mode to muffle an active HTAWS warning.
Muting of a Caution will last for the duration of the caution alert. Muffling of an
RP mode warning will last 10 seconds at which time the pilot may elect to remuffle the alert.
7.6.8 HTAWS ANNUNCIATORS
When HTAWS is installed, HTAWS mode and status annunciations are
provided at the lower-left corner of the HTAWS enabled GTN unit. In addition,
HTAWS mode and alert annunciators external to the GTN will be present.
If an optional G500H system is installed in the helicopter, then all HTAWS
mode and status annunciators from the GTN will be provided on the primary
flight display of the G500H.
If no G500H system is installed, then two HTAWS mode and status
annunciators from the GTN will be installed in the eyebrow panel adjacent to
the aircraft annunciator panel. One annunciator provides visual alerts for
HTAWS warning (red) and caution (yellow) conditions. The second annunciator
indicates whether HTAWS protection is being provided by means of a dual
color HTAWS N/A indication. When “HTAWS N/A” is illuminated in amber,
HTAWS protection is not being provided as the result of either a system failure
or loss of a required input. When “HTAWS N/A” is illuminated in white,
HTAWS protection is not being provided as the result of either automatic
inhibiting below 30 knots groundspeed or pilot inhibiting of HTAWS alerting.
7.7 Traffic System (Optional)
Traffic may be displayed on the GTN when connected to an approved optional
TCAS I, TAS, ADS-B, or TIS traffic device. These systems are capable of
providing traffic monitoring and alerting to the flight crew. Traffic shown on the
display may or may not have traffic alerting available.
The system is configured for the following type of traffic system. The Garmin
GTN 6XX or 7XX Cockpit Reference Guide or Garmin GTN 6XX or 7XX
Pilot’s Guide provides additional information regarding the functionality of the
traffic device.
 No traffic system is interfaced to the GTN.
 A TAS/TCAS I traffic system is interfaced to the GTN.
 A TIS traffic system is interfaced to the GTN.
 A TCAD traffic system is interfaced to the GTN.
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7.8 Data Links (Optional)
The GTN is configured for the following type of data links. The Garmin GTN
6XX or 7XX Cockpit Reference Guide or Garmin GTN 6XX or 7XX Pilot’s
Guide provides additional information regarding the functionality of the data
link device.
 No data link is interfaced to the GTN.
 A GDL 69/69A Sirius/XM data link is interfaced to the GTN.
 A GSR 56 Iridium data link is interfaced to the GTN.
7.9 Databases
Database versions (or cycles) and effective dates are displayed on the start-up
page immediately after power-on for those databases with an effective or
expiration date. Databases with no effective or expiration dates (e.g., Terrain
database) are considered effective upon installation in the GTN. Database
information can also be viewed on the System → System Status page.
HTAWS terrain databases are regionalized. When operating out of the terrain
coverage area, HTAWS protection will be unavailable and will be indicated by
an HTAWS N/A annunciator, blue cross hatching the terrain map, and aural
“HTAWS NOT AVAILABLE” message. The coverage area for the Terrain
database can be determined by the name of the database and the coverage table
provided in the GTN Pilot’s Guide. The Obstacle database coverage area
includes the United States, Canada, and Europe. Obstacle databases that contain
wire or HOT lines cover known lines in the continental United States and parts
of Canada and Mexico.
7.10 External Switches
External switches may be installed and interfaced to the GTN. Table 3 lists the
switches and function they perform:
Switch Label
COM CHNL DWN
COM CHNL UP
COM XFER
HTAWS ALERT
ACK
MOT
PTT
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Description
Located on the cyclic. Toggles down through the
user COM frequencies.
Located on the cyclic. Toggles up through the
user COM frequencies.
Located on the cyclic. Transfers the COM active/
standby frequencies.
Located on the cyclic. Press to mute an active
HTAWS Caution when in Normal mode or
muffle an active warning for 10 seconds when in
RP mode.
Located on the instrument panel or center
console. Press to create a user waypoint at the
present position.
Located on the cyclic. Press and hold to transmit
on the selected COM.
RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
PTC
RP MODE
Located on the cyclic. Press and hold to give a
verbal command to the audio panel.
Located on the eyebrow or instrument panel.
Press to turn ON or OFF HTAWS Reduced
Protection mode. This mode is used for VFR
operations when in visual contact with terrain.
Table 3 – External Switches
7.11 Airspace Depiction and Alerts
The GTN aids the flight crew in avoiding certain airspaces with Smart Airspace
and airspace alerts. Smart Airspace de-emphasizes depicted airspace that is not
near the aircraft’s current altitude. Airspace Alerts provide a message indication
to the flight crew when the aircraft’s current ground track will intercept an
airspace type that has been selected for alerting.
NOTE
Smart Airspace and Airspace Alerts are separate features.
Turning on/off Smart Airspace does not affect Airspace
Alerts, and vice versa.
7.12 Fuel Planning Page
The Fuel Planning page uses Fuel on Board or Fuel Flow as received from an
onboard fuel totalizer, as entered by the pilot at system start-up, or as entered by
the pilot when on the Fuel Planning page. This is not a direct indication of
actual Aircraft Fuel Flow or Fuel on Board and those values are only used for
the Fuel Planning page. The fuel required to destination is only a calculated and
predicted value based on the data entered into the planner. It is not a direct
indication of how much fuel the aircraft will have upon reaching the destination.
Some approach leg types will result in the fuel burn incorrectly calculated as
zero, which will be evident when a zero value is shown for the fuel burn for a
leg.
7.13 Fuel Range Rings
The fuel range rings displayed on the moving map are intended for situational
awareness and do not represent a direct indication of endurance or fuel
remaining. The distance between the segmented green reserve ring and the
yellow zero fuel ring is 45 minutes at the current aircraft groundspeed by
default. The pilot may change the fuel reserve time value on the Map Setup
menu. Changes to the fuel reserve time persist over GTN power cycles.
Visibility of the fuel range ring may be affected by the underlying map data
selectable by the pilot. The pilot may make changes to the topographic or terrain
data in order or more clearly observe the fuel range ring at any time.
Fuel range data is derived from the interfaced fuel totalizer data. Data entered in
the Fuel Planning pages will not update the fuel range ring.
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7.14 Charts (Optional)
The GTN 725/750 can display both procedure charts and weather data on the
main map page at the same time. When data link Nexrad or Precipitation is
overlaid on the main map page, the weather data is displayed below an overlaid
procedure chart.
The chart page MENU button provides the option to invert chart colors. It is
recommended that the pilot invert chart colors during night operations to
minimize light emitted from the GTN and minimize interference with night
vision.
7.15 Transponder Control (Optional)
The GTN can be interfaced to a Garmin transponder for control and display of
squawk code, mode, and additional transponder functions. The activation of the
Enable ES button on the Transponder page does not indicate the aircraft is in
full compliance with an ADS-B Out solution in accordance with Federal
Aviation Regulation 91.227. Consult your transponder documentation for
additional information.
7.16 Telephone Audio (Optional)
Telephone audio distribution defaults to off on each power cycle of the GTN.
Prior to utilizing the telephone function the crew must distribute telephone audio
to the desired recipients. If the crew is utilizing the telephone function, it is
required that the telephone audio be turned off upon completing telephone
usage.
7.17 Depiction of Obstacles and Wires
7.17.1 Dedicated Terrain Page
The dedicated Terrain page will always depict point obstacles at zoom scales of
10 NM or less and depict wire obstacles at zoom scales of 5 NM or less. The
obstacle or wire overlay icon (see Figure 3) will be shown near the bottom of the
display when the obstacle or wire depiction is active based on the zoom scale.
NOTE
Only obstacles and wires within 500 feet vertically of the
aircraft will be drawn on the Terrain page. It is therefore
possible to have an obstacle or wire overlay icon displayed
with no obstacles or wires being depicted on the display.
Figure 3 – Obstacle Overlay Icon (Left), Wire Overlay Icon (Right)
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RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
7.17.2 Map Page
The Map page may be configured to depict point obstacles and wire obstacles at
various zoom scales by the pilot by using the Map page menu. The obstacle or
wire overlay icon (see Figure 4) will be shown near the bottom of the display
when the obstacle or wire overlay is active based on the current zoom scale and
setting selected by the pilot.
The settings chosen by the pilot on the Map page menu (including obstacle and
wire display ranges) are saved over a power cycle.
NOTE
Only obstacles and wires within 500 feet vertically of the
aircraft will be drawn on the Map page. It is therefore
possible to have an obstacle or wire overlay icon displayed
with no obstacles or wires being depicted on the display.
NOTE
The Map page may be configured by the pilot to not show
any obstacles or wires at any zoom scale.
Figure 4 – Obstacle Overlay Icon (Left), Wire Overlay Icon (Right)
7.18 Map Page
7.18.1 Configuration
The moving map and weather pages are capable of displaying a large quantity
and variety of data. Map data is layered to ensure that data that is typically more
critical is drawn above less critical data; however, at some zoom scales and
configurations the map may be cluttered with large amounts of data. Controls
are provided on the Map and Weather pages for the pilot to select which data
displayed, the declutter level, and the zoom scales at which data is added to or
removed from the display. It is the responsibility of the pilot to select settings
for the Map page that will provide the display of data most appropriate to the
operation being conducted.
7.18.2 Map Orientation
The Map and Weather pages on the GTN can be selected by the pilot to be
oriented Heading Up, Track Up, or North Up. When installed in an aircraft with
a heading source the Heading Up orientation will be available and is
recommended for use.
When installed in an aircraft without a heading source or if Track Up orientation
is selected the maps will be oriented as follows:
• Until a valid track is acquired after start-up, the track defaults to 360.
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•
•
•
When groundspeed is less than 5 knots, the ownship icon is shown as a
non-directional icon and the map orientation is latched at the last valid
track.
When groundspeed is between 5 and 10 knots, the ownship icon is
shown as a non-directional icon and the map orientation is oriented to
the current track.
When groundspeed is in excess of 10 knots, the ownship icon is a
directional icon oriented to track and the map is oriented to track.
The Terrain page will default to a Heading Up orientation if a heading data
source is installed or will orient to Track Up if no heading data is available.
When oriented to Track Up the Terrain page operation is the same as previously
described. When below 10 knots groundspeed and track up, the Terrain page
cannot be selected to Arc View.
7.18.3 Flight Plan Depiction
The Map page depicts the current active flight plan. When an Off Route
Direct-To is active the flight plan will no longer be depicted on the map.
7.19 User Defined Waypoints
When a User Defined Waypoint is created, a default name will automatically be
provided and the pilot is given the option to enter a different name for the
waypoint. Pages that have the autofill function will prevent some waypoint
names from being used. If it is desired to name the waypoint a subset of the
name of an existing waypoint in the database, then this must be accomplished on
the Waypoint Info/User Waypoints page.
Waypoints that are created when a Search and Rescue pattern is created are not
considered User Waypoints and therefore functions associated with User
Waypoints are not provided for these waypoints.
7.20 Times and Distances
Time and Distance data to the next waypoint is always calculated from the
present position to that waypoint and does not account for the path that may be
flown (such as intercepting a course) to reach the waypoint.
7.21 GTN-GTN Crossfill
Specific data will sync between GTNs when installed in a dual GTN
configuration. If data is not included in this list, then it is not crossfilled. The
following data will crossfill between the two GTNs with CROSSFILL ON or
OFF:
• User Waypoints
• FPL Catalog
• Traffic Alerts
• Missed Approach Popups
• Altitude Leg Popups
• Heading
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RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
•
•
Date/Time Conventions
CDI Scale
The following unit changes will crossfill:
• Temperature
• NAV Angle
• Fuel
The following items are crossfilled only when the GTNs are set to CROSSFILL
ON:
• User Holds
• Approaches
• Flight Plan Changes
• DTO
• Selected OBS Course Changes
7.22 European Visual Reporting Points
If the GTN is interfaced with a G500/600 PFD/MFD, and a flight plan in the
GTN contains a VRP, the G500/600 must have a database that contains the VRP
to appropriately display the VRP on the MFD map. If the database on the
PFD/MFD does not contain the VRP, the VRP will display on the MFD map as
an intersection.
7.23 Advisory Visual Approaches
The GTN will provide advisory visual approaches to many runways in the
aviation database. Lateral guidance for the visual approach is aligned with the
runway bearing. Vertical guidance is provided for those runways with VGSI
information for distances up to 4.0NM from the runway. If a Terrain database is
installed in the GTN, the GTN provides vertical guidance up to 28NM from the
runway end unless the computed glideslope would impact terrain or obstacles
from the database. If the projected impact point is less than 28NM and greater
than 4NM, the flight plan line for the approach is shortened to indicate where
vertical guidance is active for the approach. If the terrain impact point is less
than 4NM from the runway and there is no VGSI data available, vertical
guidance is not provided for that approach. Lateral guidance is still available
when vertical guidance is removed.
CDI and VDI indications are the same as those of other GPS-based approaches
(e.g., LPV or LNAV+V). The GTN annunciates “VISUAL” in the annunciator
bar to indicate a visual approach is active.
When loading or activating a visual approach, the GPA and TCH information
for that approach will be displayed on a pop-up. If there is no vertical guidance
available, the pop-up will display “(NO VERTICAL GUIDANCE)”.
NOTE
Advisory visual approaches are not available to heliports.
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7.24 Descent VNAV
The GTN can provide multi-waypoint baro-VNAV guidance for the en route
and initial approach phases of flight. Altitudes associated with instrument
procedures are retrieved from the navigation database when the procedure is
added to the flight plan.
Altitudes in cyan on the GTN are valid VNAV guidance waypoints and the
GTN will provide vertical guidance based on the displayed altitude constraints
and default flight path angle (FPA). Altitudes colored white are advisory only.
The following are recommendations for using descent VNAV:
•
It is recommended that the pilot ensure the default FPA is the same on
both installed GTNs. Failure to do so may result in different VNAV
paths on each unit.
•
The pilot should verify all altitudes for procedures after loading the
procedure into the flight plan.
In aircraft where there are multiple GDUs and two GTNs, VNAV will use the
barometer setting from the pilot-side GDU for both GTNs. In the event that the
pilot-side GDU has failed, the GTNs will use the co-pilot’s GDU barometer
setting.
Descent VNAV is limited to flight path angles (FPA) of -6° or less, and vertical
speed required of no less than -4000 fpm. If a flight plan change is made during
a VNAV descent, VNAV will be re-calculated and could result in active VNAV
path changes. If the current VNAV FPA is less than -1°, a new VNAV path may
be computed during a flight plan change and result in a new Top of Descent
point. This can also occur during VNAV Direct-To operations.
VNAV constraints are not allowed inside the FAF. VNAV altitudes are not
saved in the flight plan catalog.
When VNAV is disabled by the pilot, it will be automatically re-enabled when
the pilot initiates a lateral Direct-To to a waypoint.
7.25 Along Track Waypoints
The GTN allows for the creation of flight plan waypoints that are based off an
offset distance from a waypoint in the flight and places the new along track
waypoint (ATK) in the flight plan. Once placed in the flight plan, the pilot may
navigate using that waypoint in the same manner as other flight plan waypoints.
Along track waypoints cannot be created on a Vectors to Final (VTF) approach
and are limited to the lateral constraints of the flight plan. This means that the
pilot cannot place an ATK before the first waypoint of a flight plan or after the
last waypoint of a flight plan.
ATKs are fixed once placed and will not move if the referenced waypoint is
changed or removed from the flight plan. ATKs are not saved in the flight plan
catalog. ATKs cannot reference another ATK in the flight plan.
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RFMS, Bell 206L-3, L-4 GTN GPS/SBAS System
7.26 Database Provided Altitudes
When the GTN provides altitude data for waypoints included in IFR procedures,
the altitudes provided are those shown on the procedure chart for “Turbojet” or
“Jet” aircraft. If altitudes for other aircraft, such as “Turboprop” or “Prop”, are
required, the crew must manually edit the waypoint altitude.
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