TT21/TT22 Transponder Installation Manual
22 August 2017
00560-00
AP
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Trig Avionics Limited
8.8 ADS-B Monitor
The ADS-B Monitor is only available on installations that include an ADS-B
position source. The ADS-B Monitor provides a display of the position
information that is being transmitted in ADS-B position reports. This can
provide confirmation that the correct information is being transmitted,
particularly where the GPS source is remote from the transponder.
In the event that valid position information is NOT available from the GPS, the
latitude and longitude display will be replaced by dashes; if no valid latitude
and longitude is shown then ADS-B position information is NOT being
transmitted.
8.9 Display Brightness Control
Pressing the FN button will allow access to change the display brightness. A
bar will appear on the display with the title “Brightness” above the bar. Rotate
the Code Knob to select the desired brightness level. Press FN to save the
setting and return to the Squawk code display.
8.10 Warning Messages
If the transponder detects a problem, the screen will indicate WARNING and a
brief statement of the problem. Depending on the nature of the problem, your
transponder may not be replying to interrogations. Note the message on the
screen and pass that information to your avionics maintenance organisation.
Press ENT to clear the message; if the fault is still present the message will
reappear.
8.11 Fault Annunciation
If the transponder detects a catastrophic internal failure, the screen will indicate
FAULT and a brief statement of the problem. No replies will be made to
interrogations when a fault has been detected.
Some FAULT indications can be recovered by switching the transponder off
and back on again, although in all cases a FAULT code implies that there is a
fault with the transponder or the installation. Note the FAULT message shown
