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BRIGHTNESS AND LIGHTING CONTROLS
Text backlighting is controlled through the aircraft dimming bus.
The buttons are backlit with white LEDs which change to green
when mode is active, except as noted.
NOTE
AMX240 Appears Off
Using the manual cockpit dimming rheostat
presents a possibility of the dimmer being turned
only up a little ways during day light operation that
would appear to turn off all of the indication lights.
Checking the position of the manual cockpit
dimming control should be the first thing to check if
the AMX240 button indications appear off/broken.
ABNORMAL OPERATIONS
FAIL SAFE OPERATION
If the audio panel detects an internal problem or if it has failed or
lost power, the fail-safe feature will connect the pilot headset and
microphone directly to the COM1 transceiver. In this case, the
AMX240 is also connected to unswitched input #1 for priority
audio alerts.
When in fail-safe mode, audio will only be heard in one ear of a
stereo headset.
Manual selection of other audio panel modes will not be available
in this case.
