Gtx 335 Panel Mount Installations - Garmin GTX 335 w GPS Installation Guidance

4.1.2

GTX 335 Panel Mount Installations

This information affects panel mount installations of the transponder:
Panel mount transponders can be installed in existing avionics stack with a minimum width of 6.30
in. and at least 1.68 in. of vertical space.
A minimum distance is required forward of the instrument panel to accommodate the length of the
transponder, connectors, and the wire harness:
◦ At least 13.10 in. is required for the GTX 335.
• Modification to the instrument panel mounting rails for the avionics stack may be necessary for the
transponder mounting rack.
• Support of the forward end of the transponder mounting rack to other avionics racks or an aircraft
structure is required.
Refer to figure 4-1 and figure 4-2 for illustrations of avionics rack mounting rails used in GTX 335
installations. In order to satisfy the structural requirements for the installation of GTX 335 transponders, the
following conditions must be met:
1. If support brackets or rails need to be fabricated for this installation, they should be fabricated and
attached to the aircraft instrument panel structure in accordance with the methods outlined in FAA
AC 43.13-2B Chapter 2, AC 43.13-1B Chapter 4, and the following requirements:
a. Use 2024-T3 sheet aluminum (bare or Clad), minimum of 0.032 in. thick.
b. Use sheet metal techniques (bend radius, fillets, etc.) applicable to material type and thickness.
c. Secure the GTX 335 mounting rack with two #6 flat head screws on each instrument panel
rail (figure 4-1 and figure 4-2). Nuts, nutplates, or clipnuts can be used to secure the #6
screws.
d. Verify the fabricated parts are protected from corrosion. Apply epoxy primer that meets MIL-
P-23377 Class N, or other corrosion protection methods listed in the aircraft's maintenance
manual.
e. Fabricate and install support straps at the forward end of the mounting rack to attach to
existing racks as given in FAA AC 43.13-2B, Chapter 2.
NOTE
Verify the straps or other means of support do not obstruct the vent on the side of the unit
(refer to figure A-1) if forced air cooling is desired.
2. Make sure no screw heads or other obstructions prevent the transponder from fully engaging in the
rack.
3. Exercise caution during installation of the rack to the instrument panel. Deformation of the rack can
make it difficult to install and remove the transponder.
190-00734-17
Rev. 1
GTX 335 w/GPS Installation Guidance
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