GTX 320/320A Installation Manual Page 1-3
190-00133-01 Rev M
1.4.2 Installation Accessories
Table 1-5 Available Installation Accessories
Item Garmin P/N
Mounting Rack 115-00285-00
Connector Kit 011-00651-01
Rear Backplate 011-00677-01
Mounting Rack, Rear Backplate and Connector Kit
(Includes 115-00285-00, 011-00677-01 and 011-00651-01)
010-10161-01
Garmin GTX 320/320A Narco Adapter 010-10158-00
Garmin GTX 320/320A KT76A Adapter 010-10159-00
Garmin GTX 320/320A Antenna kit* 010-10160-00
* 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 320/320A.
1.5 Additional Equipment Required
x Antenna Sealant - Use antenna manufacturer’s instructions, install according to FAA
AC 43.13-2A.
x Cables - The installer will supply all system cables. Cable requirements and fabrication is detailed in
Section 2 of this manual.
x Hardware - #6 Flat Head Screw (6 ea.) and #6-32 Self Locking Nut (6 ea.). Hardware required to
mount installation rack is not provided.
1.6 Installation Approval
The conditions and tests required for TSO approval of the GTX 320/320A Transponder and antenna are minimum
performance standards. It is the responsibility of the installer to determine that the aircraft installation standards
for a specific type or class of aircraft are in compliance with all applicable TSO requirements. The
GTX 320/320A and antenna may be installed only if further evaluation by the applicant documents an acceptable
installation and is approved by the administrator. For GTX 320/320A TSO compliance, see Appendix A. For
antenna TSO compliance, refer to antenna manufacturer’s literature.
1.7 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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