Garmin GTX 330, GTXTM 330D TRANSPONDER INSTALLATION MANUAL
Brand: Garmin, Pages: 71
Page 16 from 71
Page 1-8 GTX 330 Installation Manual
1.9 Limited Warranty
This Garmin product is warranted to be free from defects in materials or workmanship for two years 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
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 151
st Street Unit 5, The Quadrangle, Abbey Park Industrial Estate
Olathe, Kansas 66062, U.S.A. Romsey, SO51 9DL, U.K.
Phone: 913/397.8200 Phone: 44/1794.519944
FAX: 913/397.0836 FAX: 44/1794.519222
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GTX 330 Installation Manual Page 2-1
2 INSTALLATION OVERVIEW
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
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Page 2-2 GTX 330 Installation Manual
B. The main antenna should be mounted vertically on the bottom of the aircraft. The optional
second (diversity) antenna should be mounted vertically on top of the aircraft. Horizontal
separation must be no more than 7.6 meters (25 feet).
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.
If the antenna is being installed on a composite aircraft, ground planes must be
considered. 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
2.4 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
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
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GTX 330 Installation Manual Page 2-3
2.5 Cabling and Wiring
Use AWG #24 or larger wire for all connections unless otherwise specified by the aircraft manufacturer
or Garmin. The standard pin contacts supplied in the connector kit are compatible with up to AWG #22
wire. In cases where some installations have more than one unit sharing a common circuit breaker, sizing
and wire gauge is based on aircraft circuit breaker layout, length of wiring, current draw of units, and
internal unit protection characteristics. Do not attempt to combine more than one unit on the same circuit
breaker unless it is specified on aircraft manufacturer approved drawings.
In some cases, a larger gauge wire such as AWG #18 or #16 may be needed for power connections. If
using #16 or #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each other.
This minimizes the risk of contacts touching and shorting to adjacent pins or to ground.
Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.
Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and
routing near aircraft control cables.
When routing antenna cables, observe the following precautions:
•All cable routing should be kept as short and direct as possible.
•Avoid routing cables near power sources (e.g., 400 Hz generators, trim motors, etc.) or near
power for fluorescent lighting.
•Avoid routing cable near ADF antenna cable (allow at least a 12-inch separation).
The following table lists examples of the recommended antenna cable vendors and the type of cable to be
used for specific lengths of cable. Any cable meeting specifications is acceptable for the installation.
The maximum coaxial cable attenuation at 1090 MHz must not exceed 1.5 dB. In the diversity
installation the cable characteristics must be the same to within ±0.1 dB. (Top and bottom cables of the
same length should have approximately the same characteristics.)
Max. Length (feet) ECS Type MIL-C-17 Type RG Type
8.8 M17/128 RG400
12.5 M17/112 RG304
17.0 311601 M17/127 RG393
Supplier InformationVendor: Electronic
5300 W. Franklin Drive
Franklin, WI 53132
www.ecsdirect.comMIL-C-17 types: See
current issue of
Qualified Products List
QPL-17.RG types: See current issue
of Qualified Products List
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Page 2-4 GTX 330 Installation Manual
2.6 Cooling Air
The GTX 330 meets all applicable TSO requirements without forced air cooling. The application of
forced air cooling to the rear air nozzle of the GTX 330 is highly recommended to provide beneficial
cooling to the unit.
The GTX 330 was designed to handle a constant interrogation of 450 Pulse Repetition Frequency (PRF)
per second, with short periods of 1200 PRF. Rate limit is set at 1200 PRF. A typical radar site would
interrogate the transponder once every 5 to 10 seconds for approximately 100 milliseconds at a 400 PRF
rate. In very high traffic areas with multiple ground stations and TCAS traffic it is possible to have long
term PRF rates above 450 PRF.
2.7 GTX 330 Installation
Avoid installing the unit near heat sources. If this is not possible, insure
that additional cooling is provided. Allow adequate space for installation
of cables and connectors. The installer will supply and fabricate all of
the cables. All wiring must be in accordance with FAA AC 43.13-1B
and AC 43.13-2A.
1. Assemble the connector/rack kit according to Figure B-2. Install the rack assembly according to
the dimensions given in Figure B-1 and paragraph 1.6.2, Physical Characteristics. Mounting
brackets are not supplied due to the wide range of mounting configurations available. Suitable
mounting brackets may be fabricated from sheet metal or angle stock. To insure a sturdy mount,
rear support for the unit must be provided.
2. Looking at the bottom of the transponder, make sure the front lobe of the locking mechanism is in
a vertical position. This can be accomplished by using a 3/32” Allen wrench through the face
3. Slide the unit into the rack until the front lobe of the unit touches the rack.
4. Turn the Allen wrench clockwise until unit is secured in the rack. Continue turning until tight.
Do not overtighten the screw.
5. To remove the unit from the rack, turn the 3/32” Allen wrench counterclockwise until it
disengages from the rack.