TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Trig Avionics
Page 61
TX56A/57A are not 8.33 kHz capable and so this
option will not be available.
When you have finished making changes, press the MON button again to
return to normal operation.
8.19 General Low Temperature Operation
The Nav/Com is certified to operate correctly down to -20°C, but at low
temperatures the display may be impaired. On a cold day you may need to
wait for the cockpit to warm up to ensure normal operation.
8.20 Warning Messages
If the Nav/Com detects a problem, the screen will indicate WARNING and a
brief statement of the problem. Depending on the nature of the problem, your
radio may not be working properly. Note the message on the screen and pass
that information to your avionics maintenance organisation. Press the flip-flop
button to clear the message.
The following warnings may be seen:
Radio Hot
The radio is overheating.
Stuck Mic
A PTT switch has been closed for more than 35 seconds and
the transmitter has stopped to avoid blocking the channel.
Low Volt
The aircraft power input is below 10 volts (TX56/56A) or 16
volts (TX57/TX57A).
Ant Fault
There is a problem with the aircraft communication antenna.
The radio will still try to transmit, but you may not be heard.
Tx Fail
There is a problem with the transmitter and the radio gave up
trying. You may still be able to receive but not transmit.
OBS Lost
The navigation receiver has lost the input from the OBS knob
on the CDI. The CDI will flag and you will not be able to use
it. Radials will still be displayed on the Nav/Com screen.
No Nav
The navigation receiver has failed. No Nav functions will be
