PROCEDURE TROUBLESHOOTING REFERENCE
on appropriate receiver, listening for either radio
reception or background noise.
Cycle propeller deice switch from OFF to AUTO
and return to OFF.
Cycle electric standby fuel pumps.
Pull each receiver switch (on audio control panel) out to
the off position and each receiver volume control fully
Transmitter selector switches (pilot's and copilot's
audio control panels) - INTPH.
Audio control panel volume control (pilot's) - Turn fully
clockwise. Listen for excessive noise.
Repeat for other audio control panel.
Receiver/transmitter selectors - Check as follows:
Transmit and receive on each radio using all
microphone switches one at a time.
Repeat entire procedure for each audio control panel.