TT31 Transponder Installation Manual 1 February 2010
00455-00 Issue AJ
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6.2 Test items
6.2.1 Interface Check
The Interface Check screen displays the current state of the external IDENT, external STANDBY and
external GROUND inputs. Exercise these inputs to confirm the correct behaviour.
6.2.2 Altitude Check
The Altitude check displays the current state of the altitude inputs. Individual Gray code lines are
shown to assist in fault tracing.
6.2.3 Lighting Bus
The lighting bus check displays the voltage on the lighting bus to assist in verifying the correct
operation of the lighting bus.
6.2.4 GPS Interface
The GPS interface check provides a simple confidence check that the transponder is receiving data on
the RS232 input. Note that this check does not attempt to decode the received data; it is intended only
to provide a quick wiring check in the hangar. To assure that the interface is fully operable the aircraft
should be tested with the transponder in normal operating mode, with the GPS receiver operating
correctly, and a ramp test of the transmitted parameters completed.
Trig Avionics Limited Page 21
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