User's Manual

TT21 Transponder Installation Manual 19 January 2009
00560-00 Issue AA
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9. Continued Airworthiness
Other than for periodic functional checks required by the regulations, the TT21 Mode S transponder
has been designed and manufactured to allow “on condition maintenance”. This means that there are
no periodic service requirements necessary to maintain continued airworthiness, and no maintenance is
required until the equipment does not properly perform its intended function. When service is
required, a complete performance test should be accomplished following any repair action. Repairs
should only be carried out in accordance with Trig Avionics Limited service procedures.
Page 24 Trig Avionics Limited