Garmin GTX 320A, Installation Manual

Page: 11 / 43

GTX 320/320A Installation Manual Page 2-1
190-00133-01 Rev M
2 INSTALLATION OVERVIEW
2.1 Introduction
This section provides the necessary information for installing the GTX 320/320A Transponders, and where
required, optional accessories. Installation of the GTX 320/320A Transponder should comply with the aircraft
Type Certificate (TC) or Supplemental Type Certificate (STC). Cabling will be fabricated by the installing
agency to fit each particular aircraft. The guidance of FAA advisory circulars AC 43.13-1B and AC 43.13-2A,
where applicable, may be found useful for accomplishing retro-fit installations that comply with FAA regulations.
This section contains interconnect diagrams, mounting dimensions, and information pertaining to installation.
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, the
engine(s), propeller(s), and antenna masts. It should also be as far removed as practical from landing
gear doors, access doors, or other openings that could alter its radiation pattern.
B. The antenna should be mounted on the underside of the aircraft and in a vertical position (relative to
the position of the aircraft 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 mounted a minimum distance of three feet from the
GTX 320/320A.
NOTE
If the antenna is being installed on a composite aircraft, ground planes may be required. 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 43.13-2A.