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FOR SIMULATION USE ONLY ā NOT A TRAINING AID
Interphone communications has two knobs controlling the interphone system. The
VOX knob activates the automatic voice activation of the microphone for
transmission without keying the interphone key on the power control lever (PCL).
This allows the pilots to set the level where their voices will activate the interphone
system. This helps avoid the interphone system from being activated by external
noises (wind noise, engine noise, etc.). When released, turning the VOX knob
clockwise increase the volume of voice/noise required to automatically active the
interphone system.
Conversely, turning the VOX knob counter clockwise decreases the automatic
setting. The INPH knob controls the relative volume of the interphone system
independent of the other volume settings. Rotating the INPH knob clockwise
increases the relative interphone volume and turning the INPH knob counter
clockwise decreases the relative interphone volume.
Overall headset volume is controlled by a knob placarded HDPH. Rotating the knob
clockwise will increase the volume and counter clockwise will decrease the
volume.
The front audio control panel includes a marker beacon test switch, placarded MKR,
with HI, LO, and TEST positions to test marker beacon function or select sensitivity
level for normal operation. Power for the front cockpit audio amplifier is provided
through a circuit breaker, placarded AUDIO, located on the generator bus circuit
breaker panel in the rear cockpit.
Power for the rear cockpit audio amplifier and ground crew is provided through a
circuit breaker, placarded AUDIO, located on the generator bus circuit breaker
panel in the rear cockpit.
Audio Management Unit
An audio management unit is located on the top rail in the right avionics bay. This
audio management unit provides audio amplification and control of all
communication. An intercommunications (ground crew) amplifier is located under
the top rails in the left avionics bay. This amplifier is used for ground crew
communications to the cockpits through the ground crew headset jack.
Ground Crew Headset Jack
A ground crew headset jack is provided on the left side of the aft fuselage behind a
flip cover. The jack provides an external interphone connection for ground crew
use.
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