TT21/TT22 Transponder Installation Manual 22 August 2017
00560-00 Issue AP
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Trig Avionics Limited 31
the aircraft.
6.1.5 Aircraft Category
To assist ATC tracking of aircraft, an aircraft category can be transmitted by
Mode S transponders. Using the rotary knob, select the aircraft category that
most closely matches the aircraft the transponder is installed in. If the
transponder is fitted to a vehicle rather than an aircraft, select “Surface
Vehicle”.
6.1.6 Squat Switch Source
The Squat switch input allows the transponder to automatically switch between
Airborne and Ground modes, and to automatically start and stop the flight
timer. The sense of the squat switch input can be selected using the rotary
knob. If the squat switch input is not connected the “Not Connected” option
must be selected.
6.1.7 TIS Output
If the aircraft has a Traffic Information Service (TIS) compatible display
connected to the transponder, select the appropriate interface protocol using the
rotary knob.
Note: TIS is a Mode S uplink service that is provided by some US
approach radars. TIS coverage is limited to the coverage areas of
those radars; there is no TIS provision outside the USA.
6.1.8 GPS Input
If a GPS is connected for ADS-B position reporting, select the appropriate
interface protocol using the rotary knob.
6.1.9 GPS/TIS Line Speed
If a GPS input or TIS output has been configured, you should select the
appropriate line speed using the rotary knob. Traffic displays using the Garmin
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