Garmin GDL® 82 Operating instructions

GDL® 82
Garmin
Brand
Garmin
Model
GDL® 82
Category
GPS receiver modules
Type
Operating instructions

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Garmin GDL® 82 is an all-in-one ADS-B solution that provides pilots with real-time traffic and weather information, as well as subscription-free Flight Information Service-Broadcast (FIS-B) weather data. It also offers GPS position and attitude information to compatible avionics. With its compact design and easy installation, the GDL 82 is a great choice for pilots looking to enhance their situational awareness and safety in the cockpit.

Garmin GDL® 82 is an all-in-one ADS-B solution that provides pilots with real-time traffic and weather information, as well as subscription-free Flight Information Service-Broadcast (FIS-B) weather data. It also offers GPS position and attitude information to compatible avionics. With its compact design and easy installation, the GDL 82 is a great choice for pilots looking to enhance their situational awareness and safety in the cockpit.

190-01810-11 September 2019 Revision 2
Instructions for Continued Airworthiness
& Maintenance Manual,
GDL 82 Mooney M20( ) Series STC
Aircraft make, model, registration number, and serial
number and accompanying STC configuration
information in Appendix A must be completed and
retained with aircraft permanent records.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page i
©2019 Garmin International or its subsidiaries
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The GDL 82™ and GTN™ are trademarks of Garmin International or its
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Telephone: (913) 397-8200
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Telephone: (503) 581-8101
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page ii
RECORD OF REVISIONS
Revision
Revision Date
Description
1
12/14/2017
Initial Release
2
09/23/2019
Update to add GPS 175/GNC 355 as GPS sources, and to update main
board and GPS/GBAS board software versions (non-functional)
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page iii
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
(“EAR”)
issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and
which may not
be exported, released, or disclosed to foreign nationals inside or outside of the United States
without first
obtaining an export license. A violation of the EAR may be subject to a penalty of up to 10
years imprisonment
and a fine of up to $1,000,000 under Section 2410 of the Export Administration Act of
1979. Include this notice
with any reproduced portion of this document.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
WARNING
This product, its packaging, and its components contain chemicals known to the State of California to
cause cancer, birth defects, or reproductive harm. This notice is being provided in accordance with
California's Proposition 65. If you have any questions or would like additional information, please refer
to our web site at www.garmin.com/prop65.
NOTE
All screen shots used in this document are current at the time of publication. Screen shots are intended to
provide visual reference only. All information depicted in screen shots, including software file names,
versions, and part numbers, is subject to change and may not be up to date.
WARNING
Warnings indicates that personal injury or death is possible if the instructions are not
obeyed.
CAUTION
Cautions are used to alert that damage to equipment may result if the procedural step is
not followed.
NOTE
Notes provide further information about preceding steps and/or reasons for the
particular operation.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page iv
TABLE OF CONTENTS
SECTION ........................................................................................................................................... PAGE
1 INTRODUCTION ................................................................................................................................... 1
1.1 Introduction ...................................................................................................................................... 1
1.2 Organization ..................................................................................................................................... 1
1.3 Acronyms and Abbreviations .......................................................................................................... 1
1.4 Publications ...................................................................................................................................... 2
1.5 Revision and Distribution ................................................................................................................ 2
2 SYSTEM DESCRIPTION ....................................................................................................................... 3
3 CONTROL & OPERATION ................................................................................................................... 4
3.1 GDL 82 Install Tool ......................................................................................................................... 4
4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS .................................................................. 8
4.1 Airworthiness Limitations ............................................................................................................... 8
4.2 Servicing Information ...................................................................................................................... 8
4.3 Maintenance Intervals ...................................................................................................................... 9
4.4 Visual Inspection ........................................................................................................................... 10
4.5 Electrical Bonding Test.................................................................................................................. 11
5 TROUBLESHOOTING ........................................................................................................................ 12
5.1 General ........................................................................................................................................... 12
5.2 ADS-B OUT FAIL Annunciator ................................................................................................... 14
5.3 GDL 82 Install Tool ....................................................................................................................... 14
5.4 GDL 82 Data Logging ................................................................................................................... 16
5.5 GDL 82 Connector Pinout ............................................................................................................. 17
6 EQUIPMENT REMOVAL & INSTALLATION ................................................................................. 18
6.1 GDL 82 Unit .................................................................................................................................. 18
6.2 Annunciator and Switch ................................................................................................................. 18
6.3 GPS Antenna .................................................................................................................................. 19
6.4 Transponder Antenna ..................................................................................................................... 19
7 EQUIPMENT CONFIGURATION & CHECKOUT ............................................................................ 20
7.1 System Checkout ........................................................................................................................... 20
7.2 GDL 82 Configuration ................................................................................................................... 20
7.3 GDL 82 Post-Installation Test Procedures..................................................................................... 21
8 RETURN TO SERVICE PROCEDURE ............................................................................................... 21
8.1 Maintenance Records ..................................................................................................................... 21
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page v
FIGURES
FIGURE PAGE
Figure 2-1: GDL 82 System I/O Interfaces ...................................................................................... 3
Figure 3-1: USB A and USB B Connectors ..................................................................................... 4
Figure 3-2: GDL 8X Install Tool Selection ..................................................................................... 4
Figure 3-3: GDL 82 Unit Information Page ..................................................................................... 5
Figure 3-4: GDL 82 Software Upload Page ..................................................................................... 6
Figure 3-5: GDL 82 System Configuration Page ............................................................................. 7
Figure 5-1: GDL 82 Install Tool, Faults Page ............................................................................... 15
Figure 5-2: GDL 82 Install Tool, GPS Page .................................................................................. 15
Figure 5-3: GDL 82 Install Tool, GPS Sat Status Page ................................................................. 16
Figure 5-4: GDL 82 Install Tool, Assert Log Page ........................................................................ 16
Figure 5-5: Rear View, Connector J821 ........................................................................................ 17
TABLES
TABLE PAGE
Table 1-1: Recommended Documents ............................................................................................ 2
Table 4-1: Maintenance Intervals .................................................................................................... 9
Table 5-1: General Troubleshooting Guide ................................................................................... 12
Table 5-2: System Faults Troubleshooting Guide ......................................................................... 13
Table 5-3: J821 Pinout ................................................................................................................... 17
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 1
1 INTRODUCTION
1.1 Introduction
This document provides Instructions for Continued Airworthiness (ICA) and Maintenance Manual
(MM) for the Garmin GDL 82 UAT Transmitter as installed in Mooney M20() Series aircraft under STC
SA02573SE. This document satisfies the requirements for continued airworthiness as defined by 14
CFR Part 23.1529 and Appendix G. Information in this document is required to maintain the continued
airworthiness of the GDL 82.
1.2 Organization
The following outline briefly describes the organization of this manual:
Section 2: System Description
Provides a complete description of the type design change associated with installing the GDL 82. An
overview of the system interface is also provided.
Section 3: Control & Operation
Presents basic control and operation information related to maintenance of the GDL 82.
Section 4: Instructions for Continued Airworthiness
Provides maintenance instructions for continued airworthiness of the GDL 82.
Section 5: Troubleshooting
Provides troubleshooting information to aid in diagnosing and resolving potential problems with the
GDL 82.
Section 6: Equipment Removal & Installation
Contains instructions for the removal and installation of the GDL 82.
Section 7: Equipment Configuration & Checkout
Contains instructions for configuring and testing the GDL 82 after reinstallation or replacement.
Section 8: Return to Service Procedure
Specifies return-to-service procedures required after completion of the GDL 82 maintenance.
Appendix A: Installation Specific Information
Provides a template to record general installation information and the system configuration log for a
specific installation of the GDL 82.
1.3 Acronyms and Abbreviations
The following acronyms are used in this manual:
AC
Advisory Circular
ICA
ADS-B
Automatic Dependent Surveillance –
Broadcast
ICAO
AFM
Airplane Flight Manual
I/O
AFMS
Airplane Flight Manual Supplement
IM
ALT
Altitude
MM
ATC
Air Traffic Control
PC
CFR
Code of Federal Regulations
POH
DC
Direct Current
SBAS
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 2
ELA
Electrical Load Analysis
STC
EMC
Electromagnetic Checkout
SW
FAA
Federal Aviation Administration
UAT
GDL
Garmin Datalink Transceiver
USB
GNS
Garmin Navigator Series
Vs0
GPS
Global Positioning System
XPDR
GTN
Garmin Touch Navigator
1.4 Publications
When performing GDL 82 system maintenance it is recommended the following documents are available.
Table 1-1: Recommended Documents
Part Number
Garmin Document
190-01810-03
GDL 82 Pilot's Quick Start Guide
190-01810-10
GDL 82 Mooney M20() Series STC Installation Manual
190-01810-12
Airplane Flight Manual Supplement for the GDL 82 Mooney M20 Series
1.5 Revision and Distribution
This document is required for maintaining the continued airworthiness of the aircraft. When this
document is revised, every page will be revised to indicate current revision level.
Owner/operators may obtain the latest revision of this document at www.flyGarmin.com or by contacting
a Garmin dealer. Garmin contact information is available at www.flyGarmin.com.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 3
2 SYSTEM DESCRIPTION
The GDL 82 is a remote-mounted unit that contains 978 MHz and 1030 MHz transmitters, and a 1090
MHz receiver. It is installed in-line with the existing transponder and L-Band antenna. The GDL 82
transmits ownship ADS-B Out data via the UAT data link using the existing transponder’s L-Band
antenna. The GDL 82 utilizes the direct in-line connection to synchronize with the aircraft transponder via
1030 MHz interrogations to obtain the transponder Squawk (Mode 3/A) code, IDENT status and pressure
altitude.
ADS-B equipment requires GPS/SBAS data for ADS-B Out transmissions. Only the GPS/SBAS data
sources specified in the GDL 82 Mooney M20() Series STC Installation Manual, 190-01810-10, are
approved by this STC to interface with the GDL 82.
The GDL 82 uses the following interfaces:
• Aircraft Power and Ground
• Transponder Coaxial Connection
• L-Band Coaxial Connection
• GPS Coaxial Connection – Used only for internal GPS source
• 1 RS-232 I/O – Used only for external GPS source
• 1 Discrete Output – Failure Annunciator (optional)
• 2 Discrete Inputs – Anonymous Mode Switch and Squat Switch (optional)
• USB Interface – Configuring GDL 82 and Loading Software from PC
The GDL 82 System Interface Diagram is shown in Figure 2-1.
Figure 2-1: GDL 82 System I/O Interfaces
GPS Antenna
GPS Source
Bottom L-Band Antenna
(GDL 82 with GPS only)
OR
Discrete
Failure
Annunciator
Power/Ground
Transponder
RS-232
USB
PC Config
Tool
Coax
Coax
OPTIONAL
Discrete
Anonymous
Mode Switch
Discrete
Squat/WOW
Switch
GDL 82
GPS Time Mark
Coax
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 4
3 CONTROL & OPERATION
The GDL 82 user control interface is limited to ADS-B OUT FAIL annunciator and the UAT
ANONYMOUS mode switch, installation of either or both is optional. The primary ADS-B Out UAT
transmit function of the GDL 82 does not require direct user input.
Refer to the GDL 82 Pilot’s Quick Start Guide, 190-01810-03, and the Airplane Flight Manual
Supplement for the GDL 82 Mooney M20 Series, 190-01810-12, for control and operation information.
3.1 GDL 82 Install Tool
The GDL 8X Install Tool (Garmin Part Number: 006-A0248-20) allows for configuration, diagnostics,
and software loading. The tool is available for download from the Garmin Dealer Resource Center and
flyGarmin.com. The GDL 8X Install Tool requires a computer with Microsoft Windows XP or later and
an available USB 2.0 port.
A USB A-to-B cable is required to interface between a computer and the GDL 82, refer to Figure 3-1 for
details.
Figure 3-1: USB A and USB B Connectors
The GDL 82 Install Tool provides access to the following functions -
• Diagnostics – reports device information, faults, interface status and other information for post
installation checkout procedures. It also allows the unit assert log to be saved and cleared.
• Configuration – allows selection of installation options.
• System Update – allows upload of software to the GDL 82 unit.
To utilize the GDL 82 Install Tool, first disconnect power from the GDL 82, and then connect the USB
cable. Restore power to the GDL 82, and then run the GDL 8X Install Tool.
The GDL 8X Install Tool will automatically detect which unit it is interfaced with (e.g., GDL 82 or GDL
84/88). To use the GDL 82 Install Tool verify that the GDL 82 unit is checked Present and select the
GDL 82 button. See Figure 3-2.
Figure 3-2: GDL 8X Install Tool Selection
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 5
NOTE
When the GDL 82 unit is connected to the PC (via USB) and the GDL 8X Install Tool is active,
the GDL 82 will automatically be placed in Configuration Mode. To reset the GDL 82 into
Normal Mode, power down the unit, disconnect it from the USB and reapply power to the GDL
82.
3.1.1 Device Information
The Unit Information page, displays product information such as the model, part number, serial numbers,
software version and software part numbers to be viewed.
Figure 3-3: GDL 82 Unit Information Page
The other Diagnostics pages are used during post-installation checkout and troubleshooting. See Section
5.3 for details.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 6
3.1.2 Software Loading
This section contains instructions for loading GDL 82 software using the GDL 82 Install Tool. The GDL
82 comes preloaded with software. However, it is necessary to verify the software version and part
numbers. The System Update / Upload page, shown in Figure 3-4, displays the version and part number
of the GDL 82 System Software, FPGA, and GPS Software.
NOTE
Verify the installed software version in accordance with the GDL 82 Mooney M20() Series STC
Installation Manual, 190-01810-10.
The GDL 82 software is available at the Garmin Dealer Resource Center and flyGarmin.com.
Software may be loaded by performing the following steps on the Upload page:
1. Download the latest GDL 82 software from the Garmin Dealer Resource Center or
flyGarmin.com.
2. Under Step 1 – Select a File, select the Browse key and locate the file containing the GDL 82
software previously downloaded in step 1.
3. Under Step 2 – Upload Options, select the options to be loaded (i.e., System, FPGA, and/or GPS).
4. Under Step 3 – Start Upload, select the Upload Software key.
5. After successful completion, return to the Diagnostics / Unit Information page and verify the
software version and part numbers are correct.
Figure 3-4: GDL 82 Software Upload Page
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 7
3.1.3 Configuration
The GDL 82 Install Tool is used to configure the GDL 82 settings. All configurable settings must match
the GDL 82 System Configuration Log retained in the aircraft permanent records.
Figure 3-5: GDL 82 System Configuration Page
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 9
4.3 Maintenance Intervals
Periodic checks of the GDL 82 system installed by STC SA02573SE are specified in Table 4-1 at
specific intervals.
Table 4-1: Maintenance Intervals
Item
Description/Procedure
Section
No.
Interval
Equipment
Removal and
Replacement
Removal & Reinstallation of the
following items:
• GDL 82 unit
• ADS-B OUT FAIL
Annunciator
• Anonymous Mode Switch
6
On Condition
Equipment Visual
Inspection
Conduct a visual check of the GDL
82 unit, and associated wire harness
to ensure continued installation
integrity.
4.4
12 Calendar Months
Lightning Strike –
Actual or
Suspected
Inspect the coaxial cable
connections, GDL 82 bonding
hardware, antenna(s) and
surrounding areas.
4.4
On Condition
The interfacing transponder
transmit power and receiver
sensitivity must be tested and
shown to comply with Title 14 CFR
Part 43 Appendix F.
7.3
On Condition
Testing
The GDL 82 must be tested and
shown to comply with Title 14 CFR
Part 91.227.
7.3
Installation, software
update or replacement of
GDL 82 [1].
Testing
The interfacing transponder and
altimeter/altitude reporting system
must be tested and shown to comply
with Title 14 CFR Part 91.411,
91.413, and Part 43 Appendix E and
F.
7.3
In accordance with Title 14
CFR Part 91.411, 91.413,
and Part 43 Appendix E
and F.
Electrical Bonding
Check
Perform an electrical bonding check
of the GDL 82.
4.5
Every 2000 Flight hours or
ten (10) years, whichever
comes first.
[1] This interval condition includes the installation or replacement of the GPS antenna for the GDL 82
with GPS/SBAS receiver.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 10
4.4 Visual Inspection
Perform a visual inspection as detailed in this section. Check GDL 82 system components for damage or
other defects and replace as required. Inspection may require the temporary removal of a unit to gain
access to connectors. Follow guidance in Section 6 for equipment removal and replacement. Refer to
Appendix A of this manual for equipment locations. Refer to model specific Aircraft Maintenance
Manual for instructions on removing access panels or covers.
4.4.1 GDL 82 Visual Inspection
1. Inspect the GDL 82 unit and verify it is securely mounted.
2. Inspect unit fasteners and verify they are properly torqued and show no wear or damage.
Additionally -
a. Verify unit support structure is in good condition and its integrity is not compromised.
b. Inspect for corrosion and treat as required following procedures prescribed in Aircraft
Maintenance Manual.
3. Inspect any bonding straps for corrosion, loose connections, or signs of damage.
4. Inspect the condition of the wiring harness and coaxial cables.
a. Verify that all wiring and cables are securely fastened.
b. Verify that the harness shows no signs of cracking, chafing, abrasion, melting, or any
other form of damage.
c. Inspect the GDL 82 connectors for corrosion, evidence of moisture, or other defects.
Check the integrity of the shield block ground attachments to the harness connector
assembly as well as the integrity of the individual shields and their attachment.
5. If installed, inspect the ADS-B OUT FAIL annunciator and UAT Anonymous Mode switch.
a. Verify that annunciator and/or switch show no signs of damage.
b. Verify that wiring is securely fastened.
c. Inspect the labels, that they are legible and properly adhered.
d. Confirm operation of UAT anonymous mode switch and ADS-B OUT FAIL annunciator.
To check the UAT anonymous mode switch is operational, connect the laptop with
installation tool to the GDL 82 and verify the change of discrete state for the anonymous
mode switch.
4.4.2 Antenna Visual Inspection
1. Clean the antenna with water and mild soap.
2. Verify there are no cracks on the antenna body and around the antenna fasteners. If the antenna
has cracks, dents, or is otherwise broken, it must be replaced. Refer to antenna manufacturer’s
replacement instructions for details.
3. Verify the integrity of the environmental seal around the antenna base. If the antenna seal is
damaged, re-seal and complete the electrical bonding test specified in Section 4.5.
4.4.3 Post Lightning Strike Inspection
Inspection of antennas connected to the GDL 82 unit must be performed following a suspected or actual
lightning strike. Antenna and nearby aircraft structure must be inspected to verify no damage has
occurred where lightning may have attached. Antenna with visible signs of damage should be replaced.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 11
Antenna coax connection to the GDL 82 unit, grounding hardware, bonding straps, and nearby aircraft
structure supporting installation of remotely mounted GDL 82 must be inspected for damage. Repair any
damaged components, then complete the electrical bonding test specified in Section 4.5.
4.5 Electrical Bonding Test
GDL 82 Unit
1. Disconnect the antenna coaxial cables from the GDL 82.
2. Disconnect all connectors from the GDL 82.
3. Measure the DC resistance between the GDL 82 unit and the aircraft ground reference.
a. Verify the resistance is less than or equal to 2.5 milliohms in accordance with GDL 82
Mooney M20() Series STC Installation Manual, 190-01810-10, Section 4.
4. If the bonding check fails, perform the following procedures for preparation of aluminum
surfaces.
a. Clean grounding location with solvent.
b. Remove non-conductive films or coatings from the grounding location.
c. Apply a chemical conversion coat such as Alodine 1200 to the bare metal.
d. Once the chemical conversion coat is dry, clean the area.
e. Install bonding equipment at grounding location.
f. After the bond is complete, reapply a suitable film or coating to the surrounding area, if
any films or coatings were removed from the surface.
For more detail on preparing aluminum surfaces, refer to SAE ARP1870 Sections 5.1 and 5.5.
Antenna
1. Disconnect the coaxial cables from the antenna connector.
2. Measure the DC resistance between the antenna connector body and the aircraft ground reference.
a. Verify the resistance is less than or equal to 2.5 milliohms.
3. If the bonding check fails, perform the following procedures for preparation of aluminum
surfaces.
a. Clean grounding location with solvent.
b. Remove non-conductive films or coatings from the grounding location.
c. Apply a chemical conversion coat such as Alodine 1200 to the bare metal.
d. Once the chemical conversion coat is dry, clean the area.
e. Install bonding equipment at grounding location.
f. After the bond is complete, reapply a suitable film or coating to the surrounding area, if
any films or coatings were removed from the surface.
For more detail on preparing aluminum surfaces, refer to SAE ARP1870 Sections 5.1 and 5.5.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 12
5 TROUBLESHOOTING
5.1 General
This section provides information to assist troubleshooting if problems occur after completing
maintenance. Refer to the GDL 82 Configuration and Checkout Log retained in the aircraft permanent
maintenance records for a list of the interfaced equipment and system configuration data. When
troubleshooting the GDL 82, refer to the wire routing drawings and interconnect wiring diagrams that are
retained in the aircraft permanent records.
The following tables describe possible symptoms associated with the Garmin GDL 82 and provides
corresponding actions for troubleshooting. The symptoms described in the Problems column may be
possible causes of the ADS-B OUT FAIL lamp being illuminated. After completing each corrective
action, perform the appropriate return to service procedure in accordance with Section 8. If any system
fault persists after performing the associated troubleshooting actions, return the GDL 82 to Garmin for
service. See Section 6 for details.
Table 5-1: General Troubleshooting Guide
Problem
Possible Cause(s)
Corrective Action
The GDL 8X Install Tool does not indicate the
GDL 82 as Present (i.e., the GDL 8X Install
Tool will not connect to the GDL 82 unit).
• GDL 82 is not receiving
power
• Improper wiring
• Circuit breaker open
• Ensure the XPDR/UAT
circuit breaker is closed.
• Ensure the GDL 82 connector
is securely mated to the GDL
82 unit.
• Ensure the GDL 82 is
connected to the PC via USB
cable.
• Ensure the GDL 82 wiring is
correct.
Poor Interfacing Transponder Performance.
(i.e., transponder does not pass Title 14 CFR
Part 43 Appendix F, RF Peak Output Power
and Receiver Sensitivity levels.)
• GDL 82 is not receiving
power
• Due to the nature of antenna
radiation patterns, nulls or
marginal conditions may be
observed when measuring a
utilized radiated signal from
the aircraft.
• Transponder antenna is
damaged or improperly
installed.
• Coaxial cable has too high
insertion loss.
• Coaxial connectors are
improperly installed or
damaged.
• Transponder requires service
• Ensure the XPDR/UAT
circuit breaker is closed.
• Ensure the GDL 82 connector
is sealed and mated to the
GDL 82 unit.
• Ensure the GDL 82 wiring is
correct.
• Check and verify integrity of
the antenna installation,
ground planes, and coaxial
cable.
• Check for proper electrical
bonding/grounding of the
antenna installation.
• Ensure the coaxial cable is
properly rated (e.g., RG-400
or better) for the length of run
with the GDL 82 insertion
loss accounted for (see GDL
82 Mooney STC IM, 190-
01810-10, Sec. 3.3, for
details)
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 13
Table 5-2: System Faults Troubleshooting Guide
Problem
Possible Cause
Corrective Action
Position (GPS) Input Fault
• The GDL 82 is not
receiving GPS
position from its
internal GPS/SBAS
engine.
• Verify the following in the Diagnostics / GPS page of
the GDL 82 Install Tool (ref. Section 5.3):
o Source: Internal
o Time Mark: Active (green box)
o Interface Status: Receiving (green box)
• Check the integrity of the GPS antenna installation,
connections, and coaxial cable condition.
• Ensure GPS antenna has a clear, unobstructed view of
the sky.
• Wait approximately 20 minutes for the GDL 82 to
acquire position. The Diagnostics / GPS Sat Status
page of the GDL 82 Install Tool can show if the GPS is
acquiring satellites, indicated by a green boxes per
Channel.
• The GDL 82 is not
receiving GPS
position from its
external GPS source.
• Ensure the external GPS source is on and has acquired a
position fix.
• Verify the GDL 82 and external GPS source are
configured properly.
• Verify the following in the Diagnostics / GPS page of
the GDL 82 Install Tool (ref. Section 5.3):
o Source: External
o Time Mark: Active (green box)
o Interface Status: Receiving (green box)
• Ensure the wiring from the GDL 82 to the external GPS
source is connected properly. The time mark out from
the external GPS source must be connected to the
correct time mark on the GDL 82 in accordance with
the GDL 82 Mooney M20() Series STC Installation
Manual, 190-01810-10.
Control Panel (XPDR) Input
Fault
• The GDL 82 is not
receiving
transponder Mode
3/A (Squawk) code,
IDENT status, or
pressure altitude.
• Ensure transponder has power and is properly wired.
• Ensure the transponder is operating in altitude reporting
(ALT) mode.
• Ensure interfacing transponder is NOT Mode S.
• Check the coaxial cable and connections between the
GDL 82 and interfacing transponder.
Aircraft ID Fault
• ICAO address is all
ones or zeros.
• Tail Number has not
been set
• Enter the correct ICAO address in the GDL 82 Install
Tool.
• Enter the correct aircraft tail number in the GDL 82
Install Tool.
ICA/MM, GDL 82 Mooney M20( ) Series STC 190-01810-11
Rev. 2
Page 14
Problem
Possible Cause
Corrective Action
Configuration Fault
• The GDL 82
configuration is
invalid or corrupt.
• Ensure the GDL 82 is configured in accordance with
the GDL 82 Mooney M20 Series STC Installation
Manual, 190-01810-10.
• In the GDL 82 Install Tool Configuration / System
page, Reset Configuration. Reconfigure the GDL 82
unit with the correct settings.
• Contact Garmin.
Factory Calibration Fault
• The GDL 82 has
failed a calibration
self-check during
the internal power-
up integrity check.
• Contact Garmin.
UAT Transmitter Fault
• The GDL 82
transmitter has
failed.
• Inspect coaxial cables and connections.
• Ensure the GDL 82 is configured in accordance with
the GDL 82 Mooney M20 Series STC Installation
Manual, 190-01810-10.
• Contact Garmin.
Electrical Fault
• The GDL 82 has
experienced an
internal electrical
fault during the
internal power-up
integrity check.
• Ensure the GDL 82 connector is securely mated to the
GDL 82 unit.
• Ensure the GDL 82 wiring is correct.
• Contact Garmin.
FPGA Fault
• The GDL 82 Field
Programmable Gate
Array (FPGA)
software is
corrupted.
• Contact Garmin.
5.2 ADS-B OUT FAIL Annunciator
When one or more faults are present, the ADS-B OUT FAIL annunciator (if installed) will illuminate to
indicate that the ADS-B Out transmission is not operational or that required input interface(s) have failed
(e.g., GPS source or transponder).
5.3 GDL 82 Install Tool
The GDL 82 Install Tool can act as a troubleshooting interface to the GDL 82. When connected to the
GDL 82, the Diagnostics / Faults page of the GDL 82 Install Tool, shown in Figure 5-1, displays faults
reported by the GDL 82 as Active and all other faults as Inactive.
The Diagnostics / GPS page, shown in Figure 5-2, can indicate if the GDL 82 is receiving a valid GPS
signal for either the Internal or External source when the Nav Status shows a green box with either 3D Fix
or 3D Diff Fix.
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Garmin GDL® 82 Operating instructions

GDL® 82
Garmin
Brand
Garmin
Model
GDL® 82
Category
GPS receiver modules
Type
Operating instructions
This manual is also suitable for

Garmin GDL® 82 is an all-in-one ADS-B solution that provides pilots with real-time traffic and weather information, as well as subscription-free Flight Information Service-Broadcast (FIS-B) weather data. It also offers GPS position and attitude information to compatible avionics. With its compact design and easy installation, the GDL 82 is a great choice for pilots looking to enhance their situational awareness and safety in the cockpit.

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