Garmin GTX 35R, GTX 45R Installation manual

GTX 35R/45R Installation Manual

(Non-Certified Aircraft)

190-01499-10 October 2017 Revision 1

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1 10/23/17 Initial Release

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)
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INFORMATION SUBJECT TO EXPORT CONTROL LAWS

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TABLE OF CONTENTS

1 S

YSTEM OVERVIEW ........................................................................................................................1-1

1.1 Scope ......................................................................................................................................... 1-1

1.2 Equipment Description.............................................................................................................. 1-1

1.3 Definitions and Abbreviations................................................................................................... 1-2

1.4 ADS-B Capabilities................................................................................................................... 1-4

1.5 FIS-B Capabilities ..................................................................................................................... 1-4

1.6 TIS-A System Capabilities........................................................................................................ 1-6

1.7 Interface Summary .................................................................................................................... 1-6

1.8 General Specifications............................................................................................................... 1-7

1.9 Transponder Specifications ....................................................................................................... 1-7

1.10 UAT Receiver Specifications (GTX 45R Only) ....................................................................... 1-8

1.11 1090 MHz Receiver Specifications........................................................................................... 1-8

1.12 Power Specifications ................................................................................................................. 1-8

1.13 Certification............................................................................................................................... 1-9

1.14 License Requirements ............................................................................................................. 1-10

1.15 Reference Documents.............................................................................................................. 1-11

2 L
3 I

IMITATIONS ...................................................................................................................................2-1

NSTALLATION OVERVIEW .............................................................................................................3-1

3.1 Introduction ............................................................................................................................... 3-1

3.2 Unit Configurations................................................................................................................... 3-1

3.3 Accessories Supplied................................................................................................................. 3-2

3.4 Optional Accessories .................................................................................................................3-2

3.5 Necessary Installation Materials and Accessories Not Supplied .............................................. 3-3

3.6 Necessary Special Tools............................................................................................................ 3-3

3.7 Transponder Antenna ................................................................................................................ 3-4

3.8 Minimum Systems Configuration ............................................................................................. 3-5

3.9 GTX Pressure Altitude Input .....................................................................................................3-6

3.10 ADS-B In Considerations (GTX 45R Only) ............................................................................. 3-6

3.11 Bluetooth Considerations (GTX 45R Only).............................................................................. 3-6

3.12 Antenna Considerations ............................................................................................................ 3-7

3.13 Electrical Bonding..................................................................................................................... 3-8

3.14 Cabling and Wiring ................................................................................................................... 3-8

3.15 Electrical Bonding Considerations............................................................................................ 3-8

3.16 Cooling Requirements and Considerations ............................................................................... 3-8

4 I

NSTALLATION PROCEDURE ...........................................................................................................4-1

4.1 Wire Harness Installation .......................................................................................................... 4-1

4.2 Backshell Assembly Parts ......................................................................................................... 4-2

4.3 Shielded Cable Preparation ....................................................................................................... 4-3

4.4 Connector and Backshell Assembly.......................................................................................... 4-5

4.5 Coaxial Cable Installation ......................................................................................................... 4-7

4.6 GAE Installation (optional)....................................................................................................... 4-8

4.7 Equipment Rack Installation ..................................................................................................... 4-9

4.8 Unit Installation and Removal................................................................................................. 4-10

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5 CONNECTOR PINOUT INFORMATION .............................................................................................5-1

5.1 Main Board Connector - P3251................................................................................................. 5-1

5.2 ADS-B Board Connector – P3252 (GTX 45R Only)................................................................ 5-4

5.3 Power......................................................................................................................................... 5-5

5.4 Altitude Inputs........................................................................................................................... 5-6

5.5 Discrete I/O ............................................................................................................................... 5-7

5.6 Serial Data Interfaces ................................................................................................................5-8

5.7 Suppression Bus ........................................................................................................................ 5-9

5.8 Garmin Altitude Encoder ........................................................................................................ 5-10

5.9 USB Interface .......................................................................................................................... 5-11

6 P

OST INSTALLATION CONFIGURATION AND CHECKOUT .............................................................6-1

6.1 System Configuration Overview ............................................................................................... 6-1

6.2 Mounting, Wiring, and Power Checks ...................................................................................... 6-1

6.3 Configuration Mode and Settings.............................................................................................. 6-2

6.4 Unit Configuration and Software (Garmin Dealers Only) ........................................................ 6-3

6.5 Software Installation Procedure (Garmin Dealers Only) .......................................................... 6-5

7 C
A
A

ONTINUED AIRWORTHINESS ........................................................................................................7-1

PPENDIX A GTX X5 MECHANICAL DRAWINGS ..................................................................................A-1

PPENDIX B EQUIPMENT COMPATIBILITY AND CONFIGURATION .......................................................B-1

B.1 ADS-B In Displays (GTX 45R Only) ......................................................................................... B-1

B.2 GPS Sources ............................................................................................................................. B-2

A

PPENDIX C INTERCONNECT DRAWINGS ..............................................................................................C-1

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1 SYSTEM OVERVIEW

1.1 Scope

This manual is intended to provide mechanical and electrical information for use in the planning and
design of an installation of the GTX 35R/45R into an aircraft. This manual is not a substitute for an
approved airframe-specific maintenance manual, installation design drawing, or complete installation data
package. Attempting to install equipment by reference to this manual alone and without first planning or
designing an installation specific to your aircraft may compromise your safety and is not recommended.

1.2 Equipment Description

The GTX 35R/45R models include Mode S/ES transponders. These units are controlled through the GDU
displays in a G3X system.

Table 1-1 GTX 35R/45R Units

Feature

Mode S/ES X X

ADS-B traffic in
(UAT and 1090 MHz)

Connext (via RS-232 and
Bluetooth)

FIS-B In X

TIS-A traffic X

Pressure sensor module
(optional)

Interface to Garmin G3X X X

GTX 35R GTX 45R

X X

X

X

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1.3 Definitions and Abbreviations

Definitions

References made to GTX 35R/45R apply to all GTX 35R/45R models, except when noted.

The term squitter refers to a burst or broadcast of aircraft-tracking data that is periodically transmitted by a
Mode S transponder without radar interrogation. The GTX 35R/45R Mode S/ES models transmit
ADS-B Out ES. These transmissions contain additional aircraft information that includes GPS based
location information.

Abbreviations

These abbreviations and acronyms are used in this document.

AC Advisory Circular
ADF Automatic Direction Finder
ADS-B Automatic Dependent Surveillance-Broadcast
ADS-R Automatic Dependent Surveillance-Rebroadcast
AFMS Aircraft Flight Manual Supplement
AIRMET Airmen Meteorological Information
API Appliance Project Identifier
CDTI Cockpit Display of Traffic Information
ATCRBS Air Traffic Control Radar Beacon System
CFR Code of Federal Regulations
CG Center of Gravity
CONUS Continental United States
CSA Conflict Situational Awareness
DC Direct Current
DME Distance Measuring Equipment
EQF Environmental Qualification Form
ES Extended Squitter
FAA Federal Aviation Administration
FCC Federal Communications Commission
FCU Flight Control Unit
FIS-B Flight Information Services-Broadcast
FMS Flight Manual Supplement
GAE Garmin Altitude Encoder
GNSS Global Navigation Satellite System
GPS Global Positioning System
GTX Garmin Transponder
HSDB High Speed Data Bus
LAT Latitude
LON Longitude
MCP Mode Control Panel
METAR Meteorological Aviation Report
MFD Multifunction Display
MSR Message Success Rate
NOTAM Notice to Airmen
NEXRAD Next Generation Radar

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PED Portable Electronic Device
PIREP Pilot Weather Report
POH Pilot Operating Handbook
RAIM Receiver Autonomous Integrity Monitoring
RFMS Rotorcraft Flight Manual Supplement
SATCOM Satellite Communications
SBAS Satellite-Based Augmentation System
SIGMET Significant Meteorological Information
SIL Source Integrity Level
SPI Special Position Indicator
SUA Special Use Airspace
TAF Terminal Area Forecast
TAS Traffic Advisory System
TCAS Traffic Collision Avoidance System
TIS Traffic Information Service
TIS-B Traffic Information Service-Broadcast
TSO Technical Standard Order
UAT Universal Access Transceiver
UHF Ultra-High Frequency
USB Universal Serial Bus
VHF Very High Frequency
VSWR Voltage Standing Wave Ratio
WAAS Wide Area Augmentation System

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1.4 ADS-B Capabilities

NOTE

1.4.1 ADS-B Out

The GTX 35R/45R include ADS-B Out capabilities when installed with GPS position source that meets
the TSO performance requirements specified in 14 CFR 91.227

1.4.1.1 Garmin Altitude Encoder

In most installations, the GTX 35R/45R receives pressure altitude data from the G3X system. An optional
GAE sensor module is available for installations requiring pressure altitude data that meets the
requirements of TSO-C88b. The sensor module connects to the aircraft static system. The module attaches
to the rear connector plate with two screws, and has short, unshielded wires to connect to the GTX 35R/
45R unit through the rear D-sub connector.

The GAE sensor does not need to be disconnected if the GTX 35R/45R is removed fr om the
mounting rack.

1.4.2 ADS-B In

The GTX 45R includes receivers for both the UAT and the 1090 MHz frequency bands for all ADS-B In
data reception capabilities. The GTX 45R receives ADS-B transmissions from other ADS-B Out equipped
aircraft, ADS-R, and TIS-B information from ground stations. The GTX 45R supplies ADS-B data to G3X
Touch displays, certain Garmin panel-mount navigators, and certain portable devices via Bluetooth.

1.4.3 Installation Approval for ADS-B Systems

The conditions and tests necessary for TSO approval of the GTX 35R/45R are minimum performance
standards. It is the responsibility of the installer to determine if the aircraft installation conditions are
within the TSO standards.

All GTX 35R/45R unit functions are design-approved under the TSO. Changes or modifications to any
unit that are not approved can void the compliance to necessary regulations and authorization for continued
equipment usage.

It is the installer’s responsibility to make sure the ADS-B Out system installation is compliant with
14 CFR 91.227.

1.5 FIS-B Capabilities

FIS-B information is for pilot-planning and pilot near-term decisions. The information shown are areas of
inclement weather that are out of visual range or are not easily seen.

The GTX 45R receives FIS-B information from UAT ground stations in the United States. A direct line-of­sight between the ground station and aircraft is necessary to receive FIS-B data. The GTX 45R supplies
FIS-B data to G3X Touch displays, certain Garmin panel-mount navigators, and certain portable devices
via Bluetooth. Supported FIS-B data includes:

• NOTAM (includes TFRs)

•AIRMET

•SIGMET

•SUA

•METAR

•TAFs

•PIREP

• Winds/Temps Aloft

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• Regional NEXRAD

• CONUS NEXRAD

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1.6 TIS-A System Capabilities

The GTX 35R supplies information about nearby traffic through the FAA provided radar based TIS-A
service. Advisory traffic information is shown on G3X/G3X Touch displays, and compatible Garmin
panel-mount navigators.

1.7 Interface Summary

Table 1-2 Interface Summary

Interface Description Input/Output

RS-232 I/O 3 4

ARINC 429

HSDB I/O N/A 2

RS-422 I or O N/A 1

Suppression bus I/O 1 1

1PPS O 1 1

GAE module interface I/O 1 1

USB interface I/O 1 1

O 1 1

I 2 2

GTX 35R

Qty

GTX 45R

Qty

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)
Rev. 1 Page 1-6

1.8 General Specifications

Table 1-3 Physical Characteristics

Characteristic Specification

Height, standard mount 1.7 inches (43 mm)

Width, standard mount 6.3 inches (160 mm)

Length, standard mount (unit, mount, and connector backshells) 9.9 inches (252 mm)

GTX 35R weight (unit only) 1.7 lb (0.77 kg)

GTX 45R weight (unit only) 2.0 lb (0.91 kg)

GTX 35R weight with standard mounting tray, backplate, and
connectors

GTX 45R weight with standard mounting tray, backplate, and
connectors

Operating temperature range

Maximum operating altitude 55,000 feet

Humidity 95% non-condensing

Cooling External cooling not necessary

2.5 lb (1.13 kg)

2.9 lb (1.32 kg)

-40°F to 158°F (-40°C to + 70°C)

For more details refer to the EQF.

1.9 T ransponder Specifications

Table 1-4 Transponder Specifications

Characteristic Specification

Transmitter frequency 1090 MHz ± 1 MHz

Transmitter power

Receiver frequency

Receiver sensitivity

External suppression input

External suppression output

125 W min at antenna, with max 2dB cable loss

250 W nominal at unit

1030 MHz + 0.01 MHz

-74 dBm nominal for 90% replies

≥ 10 VDC to suppress

≥ 18 VDC with 300 ohm load, 28 VDC typical with no

load

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1.10 UAT Receiver Specifications (GTX 45R Only)

Table 1-5 UAT Receiver Specifications

Characteristic Specification

Frequency 978 MHz +

Modulation Continuous phase FSK, h = 0.6, raised cosine shaping, a = 0.5

Data rate 1.04 Mbps

Sensitivity -96 dBm for 90% MSR

20 ppm

1.1 1 1090 MHz Receiver Specifications

Table 1-6 1090 MHz Receiver Specifications

Characteristic Specification

Frequency 1090 MHz +

Modulation Binary pulse-position

Data rate 1 Mbps

Sensitivity -81 dBm for 90% MSR

1 MHz

1.12 Power Specifications

GTX 35R/45R units require an input voltage of between 9 VDC and 33 VDC. The maximum input power
and current is based upon maximum reply rates.

Table 1-7 Power Specifications

Specification

GTX 35R

GTX 45R

Unit Characteristic

Power input 8 W typical, 15 W maximum

Input current, typical 0.57 A 0.29 A

Input current, maximum 0.86 A 0.43 A

Power input 10 W typical, 18 W maximum

Input current, typical 0.72 A 0.36 A

Input current, maximum 1.30 A 0.65 A

14 VDC 28 VDC

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)
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1.13 Certification

The GTX 35R/45R meets compliance with the TSO(s) when interfaced with equipment and installed in
accordance with the requirements and limitations as outlined in this manual.

FIS-B information, including weather information, NOTAMs, and TFR areas, are intended to assist in
long- and near-term planning decision making. The system lacks sufficient resolution and updating
capability necessary for aerial maneuvering associated with immediate decisions.

The Appliance Project Identifier (API) for the GTX 35R/45R is GMN-01216. The API is used for project
identification with the FAA. Refer to applicable hardware and software part numbers to identify appliance
approvals.

Refer to the GTX 35R/45R Transponder TSO Installation Manual (190-01499-04) for TSO compliance
information (including applicable part numbers, deviations, and non-TSO functions).

1.13.1 Design Assurance Levels Table 1-8 Software Design Assurance Levels

System Function

Mode S transponder functionality C

Display of TIS-A traffic data C

Flight information data (FIS-B, including weather information) processing and output
to display

1090 ADS-B transmission C

1090/UAT ADS-B reception B

Correlation of TCAS traffic with ADS-B, ADS-R, and TIS-B traffic B

Conflict Situational Awareness (CSA) including visual and aural alerts B

External UAT ADS-B control C

Pressure sensor module C

Flight ID C

Bluetooth output E

HSDB packet forwarding B

Data concentrator C

DO-178B

Level

D

Table 1-9 Complex Hardware Design Assurance Levels

Function DO-254

Main board, transponder, and I/O C

ADS-B board, 978 MHz and 1090 MHz receivers C

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)
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1.13.2 Transmitter Grant of Equipment Authorization

CAUTION

NOTE

Table 1-10 Equipment Authorization

Model FCC ID

GTX 35R IPH-02133

GTX 45R IPH-02256

1.14 License Requirements

The UHF transmitter in this equipment is guaranteed to meet Federal Communications
Commission acceptance over the operating temperature range. Modifications not
expressly approved by Garmin could invalidate the license and make it unlawful to
operate the equipment.

For non-US installations consult the local spectrum management agency for
requirements.

The Telecommunications Act of 1996, effective February 8, 1996, provides the FCC discretion to
eliminate radio station license requirements for aircraft and ships. The GTX 35R/45R installation must
obey current transmitter licensing requirements. In the US, to find out the specific details on whether a
particular installation is exempt from licensing, visit the FCC website http://wireless.fcc.gov/aviation.

If an aircraft license is necessary, apply for a license on FCC Form 404, Application for Aircraft Radio
Station License. The FCC also has a fax-on-demand service to supply forms by fax. The GTX 35R/45R

owner accepts all responsibility for obtaining the proper licensing before using the transponder.

190-01499-10 GTX 35R/45R Installation Manual (Non-Certified Aircraft)
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1.15 Reference Documents

These documents are additional sources of information to install the GTX 35R/45R. The technician should
read all related reference materials along with this manual before unit installation.

Table 1-11 Reference Documents

Document P/N

Aerospace Systems Electrical Bonding and Grounding for Electromagnetic
Compatibility and Safety

Application for Aircraft Radio Station License FCC Form 404
FAA Advisory Circular, Acceptable Methods, Techniques, and Practices –

Aircraft Inspection and Repair
FAA Advisory Circular, Acceptable Methods, Techniques, and Practices –

Aircraft Alterations

SAE ARP 1870

FAA AC 43.13-1B

FAA AC 43.13-2B

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