User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Trig Avionics Limited Page 39
for the cockpit to warm up to ensure normal operation.
8.8 Warning Messages
If the transponder detects a problem, the screen will indicate WARNING and a
brief statement of the problem. Depending on the nature of the problem, your
transponder may not be replying to interrogations. Note the message on the
screen and pass that information to your avionics maintenance organisation.
Press ENT to clear the message; if the fault is still present the message will
reappear.
8.9 Fault Annunciation
If the transponder detects a catastrophic internal failure, the screen will indicate
FAULT and a brief statement of the problem. No replies will be made to
interrogations when a fault has been detected.
Some FAULT indications can be recovered by switching the transponder off
and back on again, although in all cases a FAULT code implies that there is a
fault with the transponder or the installation. Note the FAULT message shown
on the screen and pass that information to your avionics maintenance
organisation.