User's Manual
TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Page 54 Trig Avionics Limited
13.3 Front Panel Cut-out Options
The front panel controller can be fitted to either the compact mounting hole or
a conventional 57mm (2ΒΌ inch) instrument cut-out. The compact mounting is
a truncated 58 mm opening; please note that the mounting screws are NOT in
the same location for the two options.