Garmin | GDL® 88 | Garmin GDL® 88 Rotorcraft Flight Manual Supplement, Garmin GDL 84H/88H Bell 206L 3, L-4

Garmin GDL® 88 Rotorcraft Flight Manual Supplement, Garmin GDL 84H/88H Bell 206L 3, L-4
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
LOG OF REVISIONS
Revision
Number
Date
Description
1
07/29/2015
Complete Supplement
190-01310-J4 Rev. 1
FAA APPROVED
Page 2 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Table of Contents
SECTION
Section 1. LIMITATIONS
1.1 Minimum Equipment
1.2 ADS-B Out
1.3 Anonymous Mode
1.4 Applicable System Software
1.5 Pressure Altitude Broadcast Inhibit (PABI)
1.6 Traffic Alerting
1.7 Rotorcraft with No Heading Source
Section 2. NORMAL PROCEDURES
2.1 Unit Power On
2.2 Before Takeoff
2.3 VISUAL/AURAL TRAFFIC ALERT
Section 3. EMERGENCY / MALFUNCTION PROCEDURES
3.1 Emergency Procedures
3.2 Abnormal Procedures
Section 4. PERFORMANCE
Section 5. WEIGHT AND BALANCE
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MANUFACTURER’S DATA
Section 1. SYSTEM DESCRIPTIONS
Garmin GDL 84H/88H UAT Transceiver
Capabilities
Installation Configuration
Definitions
Pilot’s Guide
Mode 3/A Code, IDENT, and Emergency Status
Flight ID
Transmitted Air Ground Status
Pressure Altitude Broadcast Inhibit
Traffic Sources and Alerting
On Scene Mode (OSM)
Interfaced Active Traffic System (Optional, GDL 88H Only with GTN)
Power
External Switches
190-01310-J4 Rev. 1
FAA APPROVED
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Page 3 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Section 1. LIMITATIONS
1.1
Minimum Equipment
The GDL 84H must have the following system interfaces fully functional in
order to be compliant with the requirements for 14 CFR 91.227 ADS-B Out
operations:
Number
Number Required
Installed
Transponder
1 or more
1
Barometric altitude source
1 or more
1
Table 1 – Required Equipment
Interfaced Equipment
The GDL 88H must have the following system interfaces fully functional in
order to be compliant with the requirements for 14 CFR 91.227 ADS-B Out
operations:
Number
Number Required
Installed
GPS Navigator (GTN or GNS)
1 or more
1
Transponder
1 or more
1
Barometric altitude source
1 or more
1
Table 2 – Required Equipment
Interfaced Equipment
1.2
ADS-B Out
The GDL 84H/88H only complies with 14 CFR 91.227 for ADS-B Out when all
required functions are operational as indicated by:
1.3

External ADS-B annunciator not illuminated (if installed) OR

GTN or GNS interfaced display - GDL 88 ADS-B messages for ADSB Out functions not anunnciated.
Anonymous Mode
Anonymous Mode must only be operated while operating under VFR while
squawking a VFR code. If requested by Air Traffic Control, Anonymous Mode
must be turned off.
190-01310-J4 Rev. 1
FAA APPROVED
Page 4 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
1.4
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Applicable System Software
This RFMS is applicable to the software versions shown in Table 3.
The Main software version is displayed on the External LRU page available on
some interfaced display devices
GDL 84H/88H Software Version
(or later FAA Approved versions for this STC)
3.32
Table 3 - Software Versions
1.5
Pressure Altitude Broadcast Inhibit (PABI)
While operating within airspace requiring ADS-B equipment, per 14 CFR
91.225, Pressure Altitude Broadcast Inhibit shall only be enabled when
requested by Air Traffic Control.
1.6
Traffic Alerting
Traffic alerting is an aid to visual acquisition and may not be used as the sole
basis for rotorcraft maneuvering.
1.7
Rotorcraft with No Heading Source
Rotorcraft which do not have a heading source interfaced to the GDL 88H are
subject to the following limitations:

The traffic page is oriented to rotorcraft TRACK, which may or may
not align with rotorcraft heading.

The traffic display will not show ADS-B traffic when groundspeed is
less than 15 knots. The traffic display will show “UNAVAILABLE”.

If interfaced with a TCAS system the targets from the TCAS system
which are not correlated with ADS-B targets will be displayed at a
bearing on the display that is incorrect by the crab angle of the
rotorcraft (difference between track and heading). When operating
with significant crab angles such as in rearward or sideward flight
above 15 knots the traffic display shall not be used.
190-01310-J4 Rev. 1
FAA APPROVED
Page 5 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Section 2. NORMAL PROCEDURES
The procedures described below are specific only to the GDL 84H/88H.
Cockpit Reference Guides and Pilot Guides for interfaced displays will provide
additional operating information specific to the displays or other traffic systems.
2.1
Unit Power On
GDL 84H/88H Annunciations .................................................... CONSIDERED
NOTE
The GDL 84H ADS-B Annunciator will flash on/off for
approximately 20 seconds after power up if a fault was
present during the previous power cycle. This indicates the
unit requires service but does not indicate that the unit will
not comply with 91.227.
The GDL 84H/88H only complies with 14 CFR 91.227 for
ADS-B Out when all required functions are operational as
indicated when the ADS-B annunciator is not illuminated.
2.2
Before Takeoff
GDL 84H/88H Annunciations ..................................................... CONSIDERED
TRAFFIC AURALS ON/OFF Switch ......................................... CONSIDERED
2.3
VISUAL/AURAL TRAFFIC ALERT
Traffic Alert Annunciation and Aural
Traffic……………….………………………….…….VISUALLY ACQUIRE
Section 3. EMERGENCY / MALFUNCTION PROCEDURES
3.1
Emergency Procedures
None.
3.2
Abnormal Procedures
3.2.1 Abnormal Indications
The loss of a required input to the GDL 84H/88H may cause the GDL 84H/88H
to stop transmitting ADS-B Out data or providing ADS-B In functions.
190-01310-J4 Rev. 1
FAA APPROVED
Page 6 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Depending on the nature of the fault or failure, the GDL 84H/88H may no
longer be transmitting all of the required data in the ADS-B Out messages to
comply with 91.227 and Traffic Alerts may not be provided by the system.

For GDL 84H installations:
If the GDL 84H detects any failures that affect compliance with the
requirements of 91.227, the GDL 84H will immediately annunciate this
event via the external ADS-B annunciator panel (if installed).
ADS-B annunciator illuminated:
Transponder......................................................... ..........VERIFY ON
ADS-B Circuit Breaker.........................................VERIFY CLOSED
When the GDL 84H detects a FAULT that does not affect compliance
with requirements of 91.227 this will be annunciated to flight crew at
the beginning of the next power cycle by flashing the ADS-B
annunciator on/off for approximately 20 seconds after power up.
Contact service to resolve the fault.

For GDL 88H Installations with an interfaced display:
System Messages with “GDL 88 ADS-B Not Transmitting
Position”:
Interfaced GPS position sources.............VERIFY VALID POSITION
System Messages with “GDL 88 ADS-B Control Panel Input
Fault”:
Transponder..........................................................VERIFY ON or ALT
Other System Messages:
Refer to pilot documentation for display device.
Section 4. PERFORMANCE
No change.
Section 5. WEIGHT AND BALANCE
See current weight and balance data.
190-01310-J4 Rev. 1
FAA APPROVED
Page 7 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
MANUFACTURER’S DATA
Section 1. SYSTEM DESCRIPTIONS
Garmin GDL 84H/88H UAT Transceiver
The Garmin GDL 84H/88H UAT Transceiver is an ADS-B system comprised of
a Garmin TSO-C154c GDL 84H/88H, one or two UAT/1090 antenna(s),
optional Garmin approved GPS/SBAS antenna, optional Garmin GPS/SBAS
position source, and other interfaces as shown in the following block diagram.
GPS Antenna
Traffic Alerting (Optional)
ADS-B
ADS-B
Annunciator
Annunciator
(Optional)
TRAFFIC
Annunciator
Altitude
Altitude
Reporting
Reporting
On/Off Switch
Switch
(self interrogation only)
Audio Panel
Transponder
Traffic Aurals
On/Off Switch
(without Radio Altitude)
GDL 84H
Traffic Mute
Switch
(Optional)
Altitude Source
Sensor
Heading
(Optional)
Radio Altitude
OR
Anonymous
Mode Switch
(Optional)
Collective
Switch
Legend
Bottom
UAT Antenna
= Installed by
this STC
= Prerequisite
Installation
Figure 1 – GDL 84H Block Diagram
Top
UAT Antenna
GDL 88DH Only
Heading
(Optional)
GTN 6XX/7XX
or
GNS 400W/500W Series
Radio Altitude
(Optional)
Transponder
Altitude Source
GDL 88H
or
GDL 88DH
Collective
Switch
(Optional)
TAS/TCAS
(Optional)
Audio Panel
Traffic Mute
Switch
(Optional)
Legend
Bottom
UAT Antenna
= Installed by
this STC
= Prerequisite
Installation
Figure 2 – GDL 88H Block Diagram
190-01310-J4 Rev. 1
Page 8 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
The GDL 84H/88H system performs following functions:
 Transmission of ADS-B out data on UAT (978 MHz)
o Integration of data from internal and external sources to
transmit the following data per 14 CFR 91.227
 GPS Position, Altitude, and Position Integrity
 Ground Track and/or Heading, Ground Speed, and
Velocity Integrity
 Air Ground Status
 Flight ID, Call Sign, ICAO Registration Number
 Capability and Status Information
o Transponder squawk code, IDENT, and emergency status
o Anonymous Mode (When not installed in conjunction with a
Mode S transponder)
o Pressure Altitude Broadcast Inhibit
 Reception of ADS-B In data on UAT (978 MHz)
o ADS-B (Data directly from another transmitting aircraft)
o ADS-R (Rebroadcast of ADS-B data from a ground station)
o TIS-B (Broadcast of secondary surveillance radar (SSR)derived traffic information from a ground station)
o FIS-B (Broadcast of aviation data from a ground station)
 Reception of ADS-B In data on 1090 MHz
o ADS-B (Data directly from another transmitting aircraft)
o ADS-R (Rebroadcast of ADS-B data from a ground station)
 Provide ADS-B OUT status via an ADS-B annunciator lamp (GDL
84H Only)
 Provide traffic alerting to the pilot via an optional TRAFFIC
annunciator lamp and audio output (GDL 84H Only).
In addition to the above functions the GDL 88H system performs the following
functions:
 Provide ADS-B OUT status and controls via an interfaced display
 Provide traffic information and alerting to the pilot via an interfaced
display and audio output.
o Correlation and consolidation of traffic data from multiple
traffic sources
 Output of traffic data to an external display
 Aural and visual traffic alerting
 Provide FIS-B data to the pilot via an interfaced display
o Processing and output of FIS-B data to an external display
 Graphical and textual weather products
 NEXRAD
 PIREPs
 AIRMET/SIGMETs
 METARs
 TAFs
190-01310-J4 Rev. 1
Page 9 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA

ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
 Winds Aloft
Aviation Data
 TFRs
 NOTAMs
Capabilities
As installed in this rotorcraft, the Garmin GDL 84H/88H system complies with
the requirements of AC 20-165A.
The GDL 84H/88H ADS-B OUT system has been shown to meet the equipment
requirements of 14 CFR 91.227
The GDL 88H meets the requirements of TSO-C195a Class C1, C2, C3, C5,
TIS-B Services TSO-C166b Class A1, and FIS-B TSO-C157a for ADS-B In
Operation and AC 20-172A for Airworthiness Approval for ADS-B In Systems
and Applications
Installation Configuration
This rotorcraft is equipped with a GDL 84H/88H system with the following
interfaces/ features (appropriate boxes will be checked):
Equipment Installed:
 GDL 84H
 GDL 88H
Interfaced Active Traffic System (GDL 88H Only):
 Yes
 No
Interfaced Heading Source(s):
 Yes
 No
PABI Control
 External Switch
 Transponder control (move from ALT to ON)
 Controlled via display
190-01310-J4 Rev. 1
Page 10 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Anonymous Mode
 Not Available
 External Switch
 Controlled via display
Height Above Terrain/Airport Data Source
 Not Available
 Radar Altimeter
 GPS Navigator
190-01310-J4 Rev. 1
Page 11 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Definitions
The following terminology is used within this document:
ADS-B:
Automatic Dependent Surveillance-Broadcast
ADS-R:
Automatic Dependent Surveillance-Rebroadcast
CSA:
Conflict Situational Awareness
ENG:
Electronic News Gathering
FIS-B:
Flight Information Service-Broadcast
GDL:
Garmin Datalink
GPS:
Global Positioning System
GTN:
Garmin Touchscreen Navigator
LRU:
Line Replaceable Unit
PABI:
Pressure Altitude Broadcast Inhibit
SBAS:
Satellite-Based Augmentation System
TCAS:
Traffic Collision Avoidance System. In this document this
term is used to refer to TCAS I, TAS, and TCAD systems.
TIS-B:
Traffic Information Service-Broadcast
UAT:
Universal Access Transceiver
VFR:
Visual Flight Rules
Unless otherwise noted, GDL 88H is synonymous with GDL 88H and
GDL 88DH.
190-01310-J4 Rev. 1
Page 12 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Pilot’s Guide
The Garmin GDL 84/88 Pilot’s Guide, part number and revision listed below,
contain additional information regarding GDL 84H/88H system description,
control, and function. Cockpit Reference Guides and Pilot Guides for interfaced
displays provide additional operating information.
 GDL 84/88 ADS-B Transceiver Pilot’s Guide
P/N 190-01122-03 Rev E or later
Mode 3/A Code, IDENT, and Emergency Status
Mode 3/A Code, IDENT, and Emergency Status data that is included in the
ADS-B OUT message is obtained automatically by the GDL 84H/88H. No pilot
action except normal use of the transponder is required.
Flight ID
Flight Identification will default to the aircraft registration. If interfaced with a
Garmin transponder or GTN an alternate Flight ID can be entered via those
interfaces and will automatically be updated at the GDL 84H/88H.
Transmitted Air Ground Status
The ADS-B OUT message includes the air/ground status of the rotorcraft.
Rotorcraft which do not have a Radar Altimeter OR GNS or GTN display
interfaced to the GDL 84H/88H will transmit “in air” any time the collective is
raised. Rotorcraft which have a Radar Altimeter OR GNS or GTN display
interfaced to the GDL 84H/88H will transmit “in air” any time the height above
the surface is more than 25 feet or groundspeed is in excess of 15 knots.
Pressure Altitude Broadcast Inhibit
For rotorcraft with an interfaced Garmin GTX 33/330/32/327 or SL 70
transponder the broadcast of pressure altitude is controlled by the transponder
mode. Turning the transponder to ALT will also broadcast pressure altitude in
the ADS-B output. Turning the transponder to ON will inhibit pressure altitude
from being broadcast.
For rotorcraft without a Garmin GTX 33/330/32/327 or SL 70 transponder
pressure altitude broadcast is controlled via a separate switch or interfaced GNS
or GTN display.
190-01310-J4 Rev. 1
Page 13 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
Traffic Sources and Alerting
The GDL 84H/88H is capable of receiving ADS-B, ADS-R, and TIS-B traffic
reports in order to track traffic around the rotorcraft and provide alerts to the
flight crew to aid in visual acquisition and avoidance.
Traffic alerting is provided via a visual annunciator and audio callouts for these
alerts.
Rotorcraft which have a Radar Altimeter OR GNS or GTN display interfaced to
the GDL 84H/88H will truncate traffic aural alerts to not include bearing,
distance, and relative altitude information when less than 200 ft above the
surface. Additionally, the GDL 84H/88H will reduce the protected volume
around these rotorcraft when operating below 200 ft above the surface and less
than 60 kts groundspeed to minimize nuisance alerts in the airport area while
still providing traffic alerts on other eligible ADS-B OUT equipped aircraft.
Aircraft which are ADS-B participants transmitting on the 1090 MHz band do
not transmit altitude while in the on ground state and thus will not generate
traffic alerts until becoming airborne.
Due to some aircraft not being required to equip for ADS-B Out, as well as the
nature of TIS-B, its service volumes, not all traffic will be tracked by the GDL
84H/88H. This is much like an active traffic system which does not track nontransponder equipped aircraft. The flight crew must use “see and avoid”
procedures to visually acquire and avoid other aircraft.
On Scene Mode (OSM)
Rotorcraft which have a GTN display interfaced to the GDL 88H have the
ability to use On Scene Mode (OSM). OSM reduces the protected volume
around the rotorcraft for alerts that would be produced by other ADS-B
equipped helicopters. OSM must turned ON and OFF by the pilot using the
controls in the MENU of the GTN’s traffic page and is intended to be used when
intentionally operating in close proximity to other helicopters for activities such
as ENG. OSM does not affect the protected volume for other airplanes or nonADS-B equipped helicopters.
Interfaced Active Traffic System (Optional, GDL 88H Only with GTN)
When an active traffic system is interfaced with a GDL 88H, the GDL 88H
receives traffic from the active traffic system and attempts to correlate – or
match – this traffic with ADS-B traffic the GDL 88H has received and is already
tracking. When a correlation is made, the active traffic system or ADS-B target
190-01310-J4 Rev. 1
Page 14 of 15
Garmin International
1200 E. 151st Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
with the most accurate information is displayed to the flight crew. Any active
traffic system or ADS-B traffic that is not correlated will also be displayed for
the flight crew. The correlation of traffic by the GDL 88H ensures that only the
most accurate, and no duplicate, traffic targets are displayed for the flight crew’s
situational awareness.
In addition, the GDL 88H will use its air-ground logic or inputs to automatically
switch the active traffic from Standby to Operate when transitioning from
ground to air, and from Operate to Standby when transitioning from air to
ground.
If the GDL 88H fails then external traffic device data is no longer sent to the
display.
When interfaced to an active traffic system, traffic alerts are provided as
follows:
 Alerts will be provided by the TCAS system for targets tracked solely
via TCAS AND targets that tracked via TCAS and ADS-B which are
correlated.
 Alerts will be provided by the GDL 84H/88H for targets that are
tracked solely by ADS-B.
The optional interfaced display’s Pilot’s Guides and supplements provide
additional information regarding the functionality and control of the traffic
device.
Power
Power to the GDL 84H/88H is provided through a circuit breaker labeled
“ADS-B”.
External Switches
External switches may be installed in conjunction with the GDL 84H/88H.
Table 4 lists the switches and function they perform:
Switch Label
ADS-B
ALTITUDE REPORTING
ANONYMOUS
TRAFFIC MUTE
TRAFFIC AURALS
ON/OFF
190-01310-J4 Rev. 1
Function
Enables and disables Pressure Altitude
Broadcast Inhibit functionality.
Enables and disables Anonymous Mode
functionality.
Acknowledges and mutes a currently
playing aural Traffic Alert.
Turns ON or OFF aural alerts from the
GDL 84H/88H
Table 4 – External Switches
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