User's Manual

TY91/TY92 VHF Radio Installation Manual 11 April 2012
00839-00 Issue AA
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Trig Avionics Limited 17
mm to 5 mm. If a thinner panel is used, you may need to exchange the screws
for shorter versions since they can bottom out in the mounting holes.
If alternate screws are required, please note that the mounting thread in each
case is 4-40.
5.3 VHF Radio Main Unit Mounting
The TY91/TY92 VHF radio is designed to be mounted in any convenient
location in the cockpit, the cabin, or an avionics bay.
The following installation procedure should be followed, remembering to allow
adequate space for installation of cables and connectors.
 Select a position in the aircraft that is not too close to any high
external heat source. (The TY91/TY92 can become warm to the
touch itself).
 Avoid sharp bends and placing the cables too near to the aircraft
control cables.
 Secure the mounting tray (p/n 00667-00) to the aircraft via the three
(3) mounting holes in the tray. The tray should be mounted to a flat
surface - it is important that the tray is supported at the dimples as
well as the three mounting points.
 Put the TY91/TY92 VHF radio into the secured mounting tray by
hooking the connector end under the lip on the tray.
 Lock the TY91/TY92 VHF radio into the mounting tray by clipping
the retaining wire over the lugs on the opposite end.
5.4 Cooling Requirements
The TY91/TY92 VHF radio meets all applicable ETSO requirements without
forced air-cooling. Reasonable air circulation should be provided.
Attention should be given to the incorporation of cooling provisions to limit
the maximum operating temperature if the TY91/TY92 is installed in close
proximity to other avionics. The reliability of equipment operating in close