Garmin GTXTM 327 TRANSPONDER INSTALLATION MANUAL
Brand: Garmin, Pages: 55
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GTX 327 Installation ManualPage 3
1.5.2 Physical Characteristics of the GTX 327
Bezel Height1.65 inches (41 mm)
Bezel Width6.25 inches (159 mm)
Rack Height (Dimple to Dimple)1.71 inches (43 mm)
Rack Width6.30 inches (160 mm)
Depth Behind Panel with
Connectors (measured from
face of aircraft panel to rear of
connector backshells)8.78 inches (223 mm)
GTX 327 Unit Weight2.4 lbs. (1.1 kg)
GTX 327 Weight (Installed with
rack and connectors)3.0 lbs. (1.4 kg)
1.6 EQUIPMENT AVAILABLE
1.6.1 Configurations Available
GARMIN P/N FRONT PANEL WITH INSTALL KIT
1.6.2 Installation Accessories
ITEM GARMIN P/N
Mounting Rack, Backplate and Connector Kit
(Includes 115-00285-00, 011-00677-01 and 011-00651-01)
Garmin GTX 327 Antenna kit*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 327.
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Page 4GTX 327 Installation Manual
1.7 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. 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 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.
1.8 INSTALLATION APPROVAL
The conditions and tests required for TSO approval of the GTX 327 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 327 TSO compliance, see Appendix A. For antenna
TSO compliance, refer to antenna manufacturer’s literature.
1.9 ATC TRANSPONDER TESTS AND INSPECTIONS
The ATC transponder tests required by 14 CFR, Part 91.413 may be conducted using a bench check or
portable test equipment and must meet the requirements prescribed in Part 43 Appendix F.
If portable test equipment with appropriate coupling to the aircraft antenna system is used, operate the test
equipment for ATCRBS transponders at a nominal rate of 235 interrogations per second to avoid possible
ATCRBS interference. An additional 3 dB loss is allowed to compensate for antenna coupling errors
during receiver sensitivity measurements conducted in accordance with Part 43 Appendix F, Paragraph
(c)(1) when using portable test equipment.
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GTX 327 Installation ManualPage 5
1.10 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
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: 913/397.8200 Phone: 44/1794.519944
FAX: 913/397.0836 FAX: 44/1794.519222
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Page 6GTX 327 Installation Manual
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GTX 327 Installation ManualPage 7
This section provides the necessary information for installing the GTX 327 Transponder, and where
required, optional accessories. Installation of the GTX 327 will differ according to equipment location
and other factors. Cabling will be fabricated by the installing agency to fit these various requirements.
This section contains interconnect diagrams, mounting dimensions, and information pertaining to
installation. Any deviations from the installation instructions prescribed in this document shall be
accomplished in accordance with the requirements set forth in 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
A. The antenna (Garmin P/N 010-10160-00) should be well removed from any 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
B. The antenna should be mounted on the underside of the aircraft and in a vertical position
when the aircraft is in level flight.
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 327.
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
A. Install the antenna according to the antenna manufacturer’s instructions and
FAA AC 43.13-1B and AC 43.13-2A.