User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Page 40 Trig Avionics Limited
9. Continued Airworthiness
Other than for periodic functional checks required by the regulations, the
TT21/TT22 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.