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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		RECORD OF REVISIONS
Revision	Revision Date	Subject
1	10/23/17	Initial Release

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INFORMATION SUBJECT TO EXPORT CONTROL LAWS

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DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES

WARNING

A warning means injury or death is possible if the instructions are not obeyed.

CAUTION

A caution means that damage to the equipment is possible.

NOTE

A note gives more information.

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This product’s packaging and components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This notice is provided in accordance with California's Proposition 65. If you have any questions or would like additional information, please refer to Garmin’s website, www.garmin.com/prop65.

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Refer to www.dtsc.ca.gov./hazardouswaste/perchlorate.

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, are subject to change.

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6. General.

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6.8Amendments and Waivers. This Agreement may be amended and any provision of this Agreement may be waived, provided that any such amendment or waiver will become and remain binding upon a Party only if such amendment or waiver is set forth in a writing by such Party. No course of dealing between or among any persons having any interest in this Agreement will be deemed effective to modify, amend or discharge any part of this Agreement or any rights or obligations of any Party under or by reason of this Agreement. No delay or failure in exercising any right, power or remedy hereunder will affect or operate as a waiver thereof; nor will any single or partial exercise thereof or any abandonment or discontinuance of steps to enforce such a right, power or remedy preclude any further exercise thereof or of any other right, power or remedy. The rights and remedies hereunder are cumulative and not exclusive of any rights or remedies that any Party would otherwise have.

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TABLE OF CONTENTS

1	SYSTEM 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	LIMITATIONS ...................................................................................................................................			2-1
3	INSTALLATION 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	INSTALLATION 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	POST 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	CONTINUED AIRWORTHINESS ........................................................................................................		7-1
APPENDIX A GTX X5 MECHANICAL DRAWINGS ..................................................................................			A-1
APPENDIX B EQUIPMENT COMPATIBILITY AND CONFIGURATION .......................................................			B-1
	B.1 ADS-B In Displays (GTX 45R Only) .........................................................................................		B-1
	B.2	GPS Sources .............................................................................................................................	B-2
APPENDIX C INTERCONNECT DRAWINGS ..............................................................................................			C-1

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1 SYSTEM OVERVIEW

1.1Scope

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.

1.2Equipment 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	GTX 35R	GTX 45R
	Mode S/ES	X	X
	ADS-B traffic in		X
	(UAT and 1090 MHz)
	Connext (via RS-232 and		X
	Bluetooth)
	FIS-B In		X
	TIS-A traffic	X
	Pressure sensor module	X	X
	(optional)
	Interface to Garmin G3X	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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1.4ADS-B Capabilities

1.4.1ADS-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.

NOTE

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

1.4.2ADS-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.

1.4.3Installation 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.

1.5FIS-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-of- sight 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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1.6TIS-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	GTX 35R	GTX 45R
			Qty	Qty
	RS-232	I/O	3	4
	ARINC 429	O	1	1
		I	2	2
	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

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1.8General 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	2.5 lb (1.13 kg)
	connectors
	GTX 45R weight with standard mounting tray, backplate, and	2.9 lb (1.32 kg)
	connectors
	Operating temperature range	-40°F to 158°F (-40°C to + 70°C)
		For more details refer to the EQF.
	Maximum operating altitude	55,000 feet
	Humidity	95% non-condensing
	Cooling	External cooling not necessary

1.9Transponder Specifications

Table 1-4 Transponder Specifications

	Characteristic	Specification
	Transmitter frequency	1090 MHz ± 1 MHz
	Transmitter power	125 W min at antenna, with max 2dB cable loss
		250 W nominal at unit
	Receiver frequency	1030 MHz + 0.01 MHz
	Receiver sensitivity	-74 dBm nominal for 90% replies
	External suppression input	≥ 10 VDC to suppress
	External suppression output	≥ 18 VDC with 300 ohm load, 28 VDC typical with no
		load

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1.10UAT Receiver Specifications (GTX 45R Only)

	Table 1-5 UAT Receiver Specifications
Characteristic		Specification
Frequency		978 MHz + 20 ppm
Modulation		Continuous phase FSK, h = 0.6, raised cosine shaping, a = 0.5
Data rate		1.04 Mbps
Sensitivity		-96 dBm for 90% MSR

1.111090 MHz Receiver Specifications

Table 1-6 1090 MHz Receiver Specifications

Characteristic	Specification
Frequency	1090 MHz + 1 MHz
Modulation	Binary pulse-position
Data rate	1 Mbps
Sensitivity	-81 dBm for 90% MSR

1.12Power 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

	Unit	Characteristic	Specification
			14 VDC	28 VDC
		Power input	8 W typical, 15 W maximum
	GTX 35R	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
	GTX 45R	Input current, typical	0.72 A	0.36 A
		Input current, maximum	1.30 A	0.65 A

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1.13Certification

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 longand 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	DO-178B
		Level
	Mode S transponder functionality	C
	Display of TIS-A traffic data	C
	Flight information data (FIS-B, including weather information) processing and output	D
	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
	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

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1.13.2 Transmitter Grant of Equipment Authorization

	Table 1-10 Equipment Authorization
Model		FCC ID
GTX 35R		IPH-02133
GTX 45R		IPH-02256

1.14License Requirements

CAUTION

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.

NOTE

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.

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1.15Reference 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	SAE ARP 1870
	Compatibility and Safety
	Application for Aircraft Radio Station License	FCC Form 404
	FAA Advisory Circular, Acceptable Methods, Techniques, and Practices –	FAA AC 43.13-1B
	Aircraft Inspection and Repair
	FAA Advisory Circular, Acceptable Methods, Techniques, and Practices –	FAA AC 43.13-2B
	Aircraft Alterations

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