Garmin GTX 330 User manual

£
Garmin International, Inc.
190-00207-02 Revision E
October 2003
GTXTM 330, GTXTM 330D
TRANSPONDER
INSTALLATION
MANUAL

Page A GTX 330 Installation Manual
Rev E 190-00207-02
© Copyright 2002 -2003
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated,
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Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a
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revision hereto is strictly prohibited.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: [phone]
Aviation Panel-Mount Technical Support Line (Toll Free): 1-888-606-5482
www.garmin.com
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate
Romsey, SO51 9DL, U.K.
Telephone: [phone]
RECORD OF REVISIONS
Revision Revision
Date
Description ECO #
A10/24/02 Initial Release 19401
B5/1/03 Upgrade to SW 3.03 20932
C6/3/03 Reverse Pins 47 and 53 on J3301 21261
D8/4/03 Added Figure 4-9, 330/327 w/Dual Display 21954
E10/22/03 Added TIS/TCAD combo and SW connector 22929
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GTX 330 Installation Manual Page i
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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 US $1,000,000 under
Section 2410 of the Export Administration Act of 1979. Include this notice with any reproduced portion of this document.
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.

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GTX 330 Installation Manual Page iii
190-00207-02 Rev E
TABLE OF CONTENTS
PARAGRAPH PAGE
1. GENERAL DESCRIPTION ............................................................................................................. 1-1
1.1 INTRODUCTION............................................................................................................................. 1-1
1.2 EQUIPMENT DESCRIPTION......................................................................................................... 1-1
1.3 TIS SYSTEM CAPABILITIES ........................................................................................................ 1-2
1.4 MUTUAL SUPPRESSION PULSES ............................................................................................... 1-2
1.5 INTERFACE SUMMARY ............................................................................................................... 1-2
1.6 TECHNICAL SPECIFICATIONS.................................................................................................... 1-4
1.6.1 Electrical Specifications......................................................................................................... 1-4
1.6.2 Physical Characteristics ......................................................................................................... 1-5
1.6.3 Configurations Available....................................................................................................... 1-5
1.6.4 Equipment Available ............................................................................................................. 1-6
1.6.5 Additional Equipment Required ............................................................................................ 1-6
1.7 INSTALLATION APPROVAL........................................................................................................1-6
1.8 AIRCRAFT STATION LICENSING REQUIREMENTS ............................................................... 1-6
1.9 LIMITED WARRANTY .................................................................................................................. 1-7
2. INSTALLATION.............................................................................................................................. 2-1
2.1 INTRODUCTION............................................................................................................................. 2-1
2.2 UNPACKING AND INSPECTING EQUIPMENT.......................................................................... 2-1
2.3 ANTENNA INSTALLATION.......................................................................................................... 2-1
2.3.1 Location Considerations ........................................................................................................ 2-1
2.3.2 Antenna Installation............................................................................................................... 2-2
2.3.3 Installation Approval Considerations for Pressurized Aircraft.............................................. 2-2
2.3.4 Antenna Cable Installation..................................................................................................... 2-3
2.4 COOLING AIR ................................................................................................................................. 2-4
2.5 GTX 330 INSTALLATION.............................................................................................................. 2-4
3. INSTALLATION PROCEDURE ..................................................................................................... 3-1
3.1 ANTENNA INSTALLATION ......................................................................................................... 3-1
3.1.1 Antenna Installation............................................................................................................... 3-1
3.1.2 Antenna Cable Connectors .................................................................................................... 3-1
3.2 ELECTRICAL CONNECTIONS ..................................................................................................... 3-1
3.3 POST INSTALLATION CHECKOUT ............................................................................................ 3-2

Page iv GTX 330 Installation Manual
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PARAGRAPH PAGE
4. SYSTEM INTERCONNECTS ......................................................................................................... 4-1
4.1 PIN FUNCTION LIST...................................................................................................................... 4-1
4.1.1 J3301...................................................................................................................................... 4-1
4.2 POWER AND LIGHTING FUNCTION .......................................................................................... 4-3
4.2.1 Aircraft Power........................................................................................................................ 4-3
4.2.2 Lighting Bus .......................................................................................................................... 4-3
4.3 TEMPERATURE INPUTS............................................................................................................... 4-3
4.4 ALTITUDE FUNCTIONS................................................................................................................ 4-4
4.4.1 Altimeter Inputs ..................................................................................................................... 4-4
4.4.2 Altimeter Calibration and Checkout ...................................................................................... 4-4
4.4.3 Altimeter Interconnect, Dual GTX 330 Installation .............................................................. 4-5
4.4.4 Altimeter Selection Priority ................................................................................................... 4-5
4.5 DISCRETE FUNCTIONS ................................................................................................................ 4-6
4.5.1 Discrete Outputs..................................................................................................................... 4-6
4.5.2 Discrete Inputs ....................................................................................................................... 4-6
4.6 SERIAL DATA ELECTRICAL CHARACTERISTICS .................................................................. 4-7
4.6.1 RS-232 Input/Output.............................................................................................................. 4-7
4.6.2 RS-232 Input/Output, Software Update Connections............................................................ 4-8
4.6.3 Aircraft with Both TIS and TCAS/TCAD Installed ............................................................. 4-8
4.6.4 ARINC 429 Input/Output ...................................................................................................... 4-9
5. POST INSTALLATION CONFIGURATION AND CHECKOUT PROCEDURE ........................ 5-1
5.1 OPERATION .................................................................................................................................... 5-1
5.1.1 Function Selector Switches.................................................................................................... 5-1
5.1.2 Code Selection ....................................................................................................................... 5-3
5.1.3 Function Display.................................................................................................................... 5-4
5.2 CONFIGURATION PAGES ............................................................................................................ 5-5
5.2.1 Configuration Menu Page...................................................................................................... 5-6
5.2.2 AUDIO MODE Pages............................................................................................................ 5-7
5.2.3 TRAFFIC INFORMATION Page ........................................................................................ 5-7
5.2.4 DISPLAY MODE Page ......................................................................................................... 5-8
5.2.5 DISPLAY BACKLIGHT Page.............................................................................................. 5-8
5.2.6 KEY LIGHTING Page ..........................................................................................................5-9
5.2.7 CONTRAST CONFIGURATION Page.............................................................................. 5-11
5.2.8 ARINC 429 CONFIGURATION Pages .............................................................................. 5-11
5.2.9 RS-232 INPUT and OUTPUT Page .................................................................................... 5-13
5.2.10 OPERATION CONFIGURATION Pages........................................................................... 5-13
5.2.11 TEMPERATURE Page........................................................................................................ 5-14
5.2.12 MODE S Address Entry Pages ............................................................................................ 5-15

GTX 330 Installation Manual Page v
190-00207-02 Rev E
PARAGRAPH PAGE
5.2.13 MODE S Aircraft Type Page............................................................................................... 5-16
5.2.14 GRAY CODE INPUT Page................................................................................................. 5-16
5.2.15 EXTERNAL SWITCH STATE Page .................................................................................. 5-17
5.2.16 ANALOG INPUT Page ....................................................................................................... 5-17
5.2.17 RS-232 INPUT Page............................................................................................................ 5-18
5.2.18 ARINC 429 CHANNELS Pages.......................................................................................... 5-18
APPENDIX A CERTIFICATION DOCUMENTS................................................................................. A-1
A.1 STC .................................................................................................................................................. A-1
A.2 Continued Airworthiness.................................................................................................................. A-3
A.3 ENVIRONMENTAL QUALIFICATION FORM ........................................................................... A-6
APPENDIX B ASSEMBLY AND INSTALLATION DRAWINGS
APPENDIX C INTERCONNECT DRAWINGS

Page vi GTX 330 Installation Manual
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LIST OF ILLUSTRATIONS
FIGURE PAGE
2-1 Antenna Installation Considerations ................................................................................................. 2-1
4-1 Rear Connector, J3301 ...................................................................................................................... 4-1
4-2 Dual GTX 330, Single Encoder, Serial Input Connections............................................................... 4-5
4-3 GTX 330, Software Update Connections.......................................................................................... 4-8
5-1 GTX 330 Front Panel ........................................................................................................................ 5-1
B-1 GTX 330 OUTLINE DRAWING .....................................................................................................B-1
B-2 GTX 330 CONNECTOR/RACK ASSEMBLY DRAWING............................................................B-3
B-3 GTX 330 RECOMMENDED PANEL CUTOUT DIMENSIONS...................................................B-5
C-1 GTX 330 TYPICAL INTERCONNECT WIRING DIAGRAM.......................................................C-1
C-2 DUAL TXP INTERCONNECT WIRING DIAGRAM, ENCODING ALTITUDE
CONNECTIONS...............................................................................................................................C-3
C-3 GTX 330 INTERCONNECT WIRING DIAGRAM, ALTITUDE AND TEMPERATURE
CONNECTIONS...............................................................................................................................C-5
C-4 GTX 330 INTERCONNECT WIRING DIAGRAM, DISCRETE AND AUDIO
CONNECTIONS...............................................................................................................................C-7
C-5 GTX 330 INTERCONNECT WIRING DIAGRAM, SERIAL DEVICES
CONNECTIONS...............................................................................................................................C-9
C-6 DUAL GTX 330 INTERCONNECT WIRING DIAGRAM, DUAL DISPLAY
CONNECTIONS.............................................................................................................................C-11
C-7 GTX 330/GTX 327 INTERCONNECT WIRING DIAGRAM, DUAL DISPLAY
CONNECTIONS.............................................................................................................................C-13
C-8 GTX 330 INTERCONNECT WIRING DIAGRAM, AIRCRAFT WITH TIS AND
TCAD/TCAS ..................................................................................................................................C-15
LIST OF TABLES
TABLE PAGE
4-1. P3301 Pin Assignments..................................................................................................................... 4-1
4-2. Aircraft Power Pin Assignments....................................................................................................... 4-3
4-3. Aircraft Lighting Pin Assignments ................................................................................................... 4-3
4-4. Temperature Probe Pin Assignments ................................................................................................ 4-3
4-5. Encoded Altitude Pin Assignments................................................................................................... 4-4
4-6. Discrete Outputs Pin Assignments.................................................................................................... 4-6
4-7. Discrete Inputs Pin Assignments....................................................................................................... 4-6
4-8. RS-232 Pin Assignments................................................................................................................... 4-7
4-9. ARINC 429 Pin Assignments ........................................................................................................... 4-9

GTX 330 Installation Manual Page vii
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GTX 330 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GTX 330 Mode S Transponder.
Mod Levels are listed with the associated service bulletin number, service bulletin date, and the purpose of the
modification. The table is current at the time of publication of this manual (see date on front cover) and is
subject to change without notice. Authorized Garmin Sales and Service Centers are encouraged to access the
most up-to-date bulletin and advisory information on the Garmin Dealer Resource web site at
www.garmin.com using their Garmin-provided user name and password.
MOD
LEVEL
SERVICE
BULLETIN
NUMBER
SERVICE
BULLETIN
DATE
PURPOSE OF MODIFICATION
At the time of this revision, the current software version for the GTX 330 is 3.03. The
software version and information in this document are subject to change without notice. Visit
the Garmin web site (www.garmin.com) for current manual updates and supplemental
information concerning the operation of this and other Garmin products.
NOTE

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GTX 330 Installation Manual Page 1-1
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1. GENERAL DESCRIPTION
1.1 INTRODUCTION
This manual describes the physical, mechanical, and electrical characteristics and the installation requirements for
the GTX 330 Mode S Transponder and GTX 330D Diversity Mode S Transponder. Throughout this manual, the
term GTX 330 applies to both transponders unless otherwise stated. After installation of the GTX 330, FAA
Form 337 must be completed by an appropriately certificated agency to return the aircraft to service.
1.2 EQUIPMENT DESCRIPTION
The Garmin GTX 330 is a panel mounted Non-Diversity Mode S Transponder while the GTX 330D is a
Diversity Mode S Transponder. The GTX 330D employs two antennas, one intended to be mounted on the
top and the other on the bottom of the aircraft. The design meets RTCA/DO-181C and EUROCAE ED-73A
specifications.
The GTX 330 transponder is a radio transmitter and receiver that operates on radar frequencies, receiving ground
radar or TCAS interrogations at 1030 MHz and transmitting a coded response of pulses to ground-based radar on
a frequency of 1090 MHz. The GTX 330 is equipped with IDENT capability that activates the Special Position
Identification (SPI) pulse for 18 seconds.
The GTX 330 replies to ATCRBS Mode A, Mode C and Mode S All-Call interrogation. Mode A replies
consist of any one of 4,096 codes, which differ in the position and number of pulses transmitted. Mode C
replies include framing pulses and encoded altitude. Mode S interrogations are selective. The Mode S
transponders can respond to a single directed interrogation from the ground station or another aircraft.
The GTX 330 is a Level 2 transponder, providing downlink of aircraft information. Ground stations can
interrogate Mode S Transponders individually using a 24-bit ICAO Mode S address, which is unique to the
particular aircraft. In addition, ground stations may interrogate a GTX 330 for its Transponder data capability and
the aircraft's Flight ID, which may be the registration number or other call sign. The GTX 330 makes the
maximum airspeed capability (set via configuration pages, see section 5) available to TCAS systems on-board
nearby aircraft to aid in the determination of TCAS advisories.
In addition to displaying the code, reply symbol and mode of operation, the GTX 330 screen displays pressure
altitude, density altitude, temperature, and timer functions, depending on equipment connections and
configuration selection. The unit also features an altitude monitor, TIS traffic advisories and flight timers. A
voice or tone audio output announces altitude deviation, TIS traffic advisory and count down timer expiration.
The GTX 330 features multiple transmit/receive ARINC 429 and RS-232 data ports. The unit concentrates data
from three ARINC 429 inputs, gray code, RS-232 input data and discrete inputs to the high-speed ARINC 429
output bus used by display systems such as the Garmin 400 Series/500 Series units.
The GTX 330 is configured with all key controls. The layout of the front panel keys and displays segregates the
transponder’s primary functions from the secondary functions. The unit can be configured so the aircraft avionics
master bus can turn the unit on.
Provision is made for unit software upgrade by means of RS-232 data through rear connector pins. If an optional
connector is placed in the aircraft, transponder removal and reinstallation for SW upgrade is not required. The
software can be changed while the unit is still mounted inside the aircraft.

Page 1-2 GTX 330 Installation Manual
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CAUTION
The GTX 330 lens is coated with a special anti-reflective coating which is very
sensitive to skin oils, waxes and abrasive cleaners. CLEANERS CONTAINING
AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is very
important to clean the lens using a clean, lint free cloth and an eyeglass lens
cleaner that is specified as safe for anti-reflective coatings.
1.3 TIS SYSTEM CAPABILITIES
The GTX 330 also provides uplink information such as Traffic Information Service (TIS). TIS is a ground-based
service providing relative location of all ATCRBS Mode A and Mode C transponder equipped aircraft within a
specified service volume. The TIS ground sensor uses real time track reports to generate traffic notification. TIS
provides a graphic display of traffic advisory information in the cockpit for non-TCAS equipped aircraft.
Advisory traffic information is available to aircraft equipped with a Mode S data link such as the Garmin
GTX 330 transponder. Advisory traffic information may be displayed on a Garmin 400/500 Series unit.
Surveillance data includes all transponder equipped aircraft within the coverage volume. Aircraft without an
operating transponder are invisible to TIS. TIS displays traffic within seven nautical miles from 3000 feet below
to 3500 feet above the requesting aircraft. The pilot sees the location, relative direction and altitude of other
aircraft.
1.4 MUTUAL SUPPRESSION PULSES
Other equipment on board the aircraft may transmit in the same frequency band as the transponder, such as
DME or another transponder. Mutual suppression is a synchronous pulse that is sent to the other equipment
to suppress transmission of a competing transmitter for the duration of the pulse train transmission. The
transponder transmission may be suppressed by an external source and other equipment on board may be
suppressed by the transponder. This feature is designed to limit mutual interference.
1.5 INTERFACE SUMMARY
The GTX 330 provides the following interface connections via the rear connector:
•Ten (10) encoding altimeter inputs.
•External IDENT input.
•External STBY input (useful for dual transponder installations).
•External suppression pulse input.
•Switched power output of up to 1.5 amps (for digital altitude encoder power).
•Aircraft power input (11 to 33 volts).
•Aircraft dimming bus input voltage.

GTX 330 Installation Manual Page 1-3
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•Aircraft master switch turn-on option.
•Serial altitude or GPS groundspeed input.
•Serial altitude input. (Reduces wire count vs. parallel wire gray code altimeter interface.)
•Software update input.
•Supports Comm-A and Comm-B protocol.
•Temperature, Altitude Hold and Density Altitude.
•Digitally recorded voice and discrete warning annunciator activated by Altitude Hold when limits are
exceeded.
•Diversity: GTX 330 is available with or without the diversity feature.
The GTX 330 supports the following list of Binary Data Selector (BDS) registers:
•BDS (0,0) Air Initiated Comm-B (AICB)
•BDS (1,0) Data Link Capability Report
•BDS (1,7) Common Usage Ground Initiated Comm-B (GICB) Capability Report
•BDS (1,8) Mode S Specific Services GICB Capability Report
•BDS (1,9) Mode S Specific Services GICB Capability Report
•BDS (1,D) Mode S Specific Services Protocols (MSP) Capability Report
•BDS (2,0) Aircraft Identification
BDS register information is presented for the installation agency to understand the functionality of the GTX 330,
and make a determination that the unit complies with the requirements of their civil aviation authorities. No
further wiring or configuration programming is required for the unit.
Note that BDS (3,0) is only required for transponders compatible with ACAS/TCAS II. The GTX 330 does not
support BDS (3,0).

Page 1-4 GTX 330 Installation Manual
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1.6 TECHNICAL SPECIFICATIONS
1.6.1 Electrical Specifications
SPECIFICATION CHARACTERISTIC
TSO, JTSO; GTX 330 TSO-C112*, JTSO-2C112a.
TSO, JTSO; GTX 330D TSO-C112*, JTSO-2C112a.
TSO ENV CAT Refer to Appendix A
FCC Authorization Emission Designator 12M0M1D
Applicable Documents RTCA DO-160D, DO-181C, EuroCAE ED-73A
Software RTCA DO-178B Level D
Temperature Range -45°C to +70°C (continuous operation)
Power Requirements 11.0 to 33.0 Vdc; Power Input: 22 watts typical, 45
watts maximum
Humidity 95% @ +50°C for 6 hours; 85% @ +38°C for 16 hours;
Tested to Category A in DO-160D
Altitude 55,000 Feet
Transmitter Frequency 1090 MHz ±1 MHz
Transmitter Power 125 watts minimum, 250 watts nominal.
Receiver Frequency 1030 MHz
Receiver Sensitivity -74 dBm nominal for 90% replies
Mode A Capability 4096 Identification Codes
Mode C Altitude Capability 100 Foot Increments from -1000 to 62,700 feet.
Mode S Altitude Capability 25 Foot Increments from -1000 to 50,175 feet with
suitable serial data altitude. 100 Foot Increments from
-1000 to 62,700 feet.
Mode S Capability Selective Identification Codes, Aircraft Type
External Suppression Input Low ≤0.5 V; High ≥8 V
Audio Output 4.04 Vrms to 7.85 Vrms into a 500 load
*Note: Refer to Paragraph 1.6.3 Configurations Available, for TSO class.

GTX 330 Installation Manual Page 1-5
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1.6.2 Physical Characteristics
SPECIFICATION CHARACTERISTIC
Bezel Height 1.65 inches (42 mm)
Bezel Width 6.25 inches (159 mm)
Rack Height (Dimple to Dimple) 1.68 inches (43 mm)
Rack Width 6.30 inches (160 mm)
Depth Behind Panel with
Connectors (measured from face of
aircraft panel to rear of connector
backshells)
11.25 inches (286 mm)
GTX 330/GTX 330D Unit Weight 3.4 lbs. (1.5 kg)
GTX 330/GTX 330D Rack Weight
(Installed with rack and connectors)
4.2 lbs. (1.9 kg)
1.6.3 Configurations Available
Model Catalog
Part
Number
Unit Part
Number
Diversity Front
Panel
Color
Install
Kit/Docs*
TSO Class
GTX 330 010-00230-00 011-00455-00 No Black No 2A1 121 010
GTX 330 010-00230-01 011-00455-00 No Black Yes 2A1 121 010
GTX 330 010-00230-20 011-00455-20 No Gray No 2A1 121 010
GTX 330 010-00230-21 011-00455-20 No Gray Yes 2A1 121 010
GTX 330D 010-00293-00 011-00455-10 Yes Black No 2A1 121 011
GTX 330D 010-00293-01 011-00455-10 Yes Black Yes 2A1 121 011
GTX 330D 010-00293-20 011-00455-30 Yes Gray No 2A1 121 011
GTX 330D 010-00293-21 011-00455-30 Yes Gray Yes 2A1 121 011
*Note: Documentation includes pilot’s guide and warranty registration card.

Page 1-6 GTX 330 Installation Manual
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1.6.4 Equipment Available
ITEM GARMIN P/N
Sub Assy, Connector Kit, GTX 330 011-00583-00
SMP, Install Rack, GTX 330 115-00294-00
Sub Assy, Backplate, GTX 330 011-00582-00
(For use with GTX 330)
Sub Assy, Backplate, GTX 330D 011-00582-01
(For use with GTX 330D)
Garmin GTX 330 Antenna kit*
(two required for diversity)
010-10160-00
*Note: A transponder antenna approved to TSO C66( ) or C74( ) that has been installed to
meet the requirements of this manual may be approved for use with the GTX 330.
1.6.5 Additional Equipment Required
•Antenna Sealant - Use antenna manufacturer’s instructions, install according to FAA AC 43.13-1B
and AC 43.13-2A.
•Cables - The installer will supply all system cables including circuit breakers. Cable requirements
and fabrication is detailed in Section 2 of this manual.
•Hardware - #6-32 x 100°Flat Head Screw (6 ea.) and #6-32 Self-Locking Nut (6 ea.). Hardware
required to mount the installation rack is not provided.
•Encoding Altitude Digitizer - Use encoding altimeter manufacturer’s instructions, install according
to FAA AC 43.13-1B and AC 43.13-2A. The Garmin GAE 43 (Garmin P/N 013-00066-00) can
provide altitude data in either serial or parallel gray code format.
1.7 INSTALLATION APPROVAL
The conditions and tests required for TSO approval of the GTX 330 Transponder and antenna are minimum
performance standards. It is the responsibility of those desiring to install this transponder and antenna either on or
within a specific type or class of aircraft to determine that the aircraft installation standards are within the TSO
standards. For GTX 330 TSO compliance and STC, see Appendix A. For antenna TSO compliance, refer to
antenna manufacturer’s literature.
1.8 AIRCRAFT STATION LICENSING 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 330 installation must comply with current
transmitter licensing requirements. To find out the specific details on whether a particular installation is exempt
from licensing, please visit the FCC web site http://wireless.fcc.gov/aviation.
If an aircraft license is required, make application for a license on FCC form 404, Application for Aircraft Radio
Station License. The FCC also has a fax-on-demand service to provide forms by fax. The GTX 330 owner
accepts all responsibility for obtaining the proper licensing before using the transponder.

GTX 330 Installation Manual Page 1-7
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1.9 LIMITED WARRANTY
This Garmin product is warranted to be free from defects in materials or workmanship for one year from the date
of purchase. Within this period, Garmin will at its sole option, repair or replace any components that fail in
normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor, provided
that the customer shall be responsible for any transportation cost. This warranty does not cover failures due to
abuse, misuse, accident or unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY
ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS,
WHICH MAY VARY FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO
USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of
incidental or consequential damages, so the above limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase
price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR
ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in locating a
Service Center near you, call Garmin Customer Service at one of the numbers shown below.
Products sold through online auctions are not eligible for rebates or other special offers from Garmin. Online
auction confirmations are not accepted for warranty verification. To obtain warranty service, an original or copy
of the sales receipt from the original retailer is required. Garmin will not replace missing components from any
package purchased through an online auction.
Garmin International, Inc. Garmin (Europe) Ltd.
1200 East 151st Street Unit 5, The Quadrangle, Abbey Park Industrial Estate
Olathe, Kansas 66062, U.S.A. Romsey, SO51 9DL, U.K.
Phone: [phone] Phone: [phone]
FAX: [phone] FAX: [phone]

Page 1-8 GTX 330 Installation Manual
Rev E 190-00207-02
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GTX 330 Installation Manual Page 2-1
190-00207-02 Rev E
2. INSTALLATION
2.1 INTRODUCTION
This section provides the necessary information for installing the GTX 330 Mode S Transponder, and where
required, optional accessories. Installation of the GTX 330 will differ according to equipment location and other
factors. Cabling will be fabricated by the installing agency to fit these various requirements. Sections 3 and 4
contain interconnect wiring diagrams, mounting dimensions, and information pertaining to installation. Each
installation shall be accomplished to meet the requirements of FAA AC 43.13-1B and AC 43.13-2A.
2.2 UNPACKING AND INSPECTING EQUIPMENT
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during
shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the original shipping
container and all packing materials. Do not return the unit to Garmin until the carrier has authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate
cardboard container should be prepared that is large enough to accommodate sufficient packing material to
prevent movement.
2.3 ANTENNA INSTALLATION
2.3.1 Location Considerations
Figure 2-1. Antenna Installation Considerations
A. The antenna(s) (Garmin P/N 010-10160-00) should be mounted away from major protrusions, such as
engine(s), propeller(s), and antenna masts. It should also be as far as practical from landing gear
doors, access doors, or other openings that could effect its radiation pattern.
B. The bottom antenna should be mounted on the underside of the aircraft and in a vertical position
when the aircraft is in level flight. The optional second antenna (for diversity) should be mounted on
the top of the aircraft. Horizontal separation must be no more than 7.6 meters (25 feet).

Page 2-2 GTX 330 Installation Manual
Rev E 190-00207-02
C. Avoid mounting the antenna within three feet of the ADF sense antenna or any other communication
antenna and six feet from the DME antenna.
D. To prevent RF interference, the antenna must be physically mounted a minimum distance of three feet
from the GTX 330.
NOTE
If the antenna is being installed on a composite aircraft, ground planes must sometimes be
added. Conductive wire mesh, radials, or thin aluminum sheets embedded in the composite
material provide the proper ground plane allowing the antenna pattern (gain) to be
maximized for optimum transponder performance.
2.3.2 Antenna Installation
Install the antenna according to the antenna manufacturer’s instructions and FAA AC 43.13-1B and
AC 43.13-2A.
2.3.3 Installation Approval Considerations for Pressurized Aircraft
Antenna and cable installations on pressurized cabin aircraft require FAA approved installation design and
engineering substantiation data whenever such installations incorporate alteration (penetration) of the cabin
pressure vessel by connector holes and/or mounting arrangements.
For needed engineering support pertaining to the design and approval of such pressurized aircraft antenna
installations, it is recommended that the installer proceed according to any of the following listed alternatives:
1. Obtain approved antenna installation design data from the aircraft manufacturer.
2. Obtain an FAA approved Supplemental Type Certificate (STC) pertaining to and valid for the subject
antenna installation.
3. Contact the FAA Aircraft Certification Office in the appropriate Region and request identification of FAA
Designated Engineering Representatives (DERs) who are authorized to prepare and approve the required
antenna installation engineering data.
4. Obtain FAA Advisory Circular AC-183C and select (and contact) a DER from the roster of individuals
identified thereunder.
5. Contact an aviation industry organization such as the Aircraft Electronics Association and request their
assistance.