AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 27
2-18-20
Page
1
Code
01
COMMUNICATION CONTROLS AND INDICATORS
COCKPIT
CONTROL WHEEL COMMUNICATIONS SWITCH (PTT)
1 - CONTROL WHEEL COMMUNICATIONS SWITCH
PTT POSITION - Momentary position. When pressed allows VHF
and HF transmissions and speech to the
passengers through Passenger Address
System. Releasing this button, it returns to the
HOT position and VHF, HF or passenger cabin
transmissions will be interrupted.
NOTE: For VHF transmissions, a continuous command of PTT
switch is limited to 2 minutes. If the PTT switch is pressed
longer than 2 minutes, the message MIC STK will be
displayed on RMU, and the microphone will be disabled.
HOT POSITION - Allows communication between crew members
and between crew members and ramp station.
OFF POSITION - Allows only audio reception.
CONTROL WHEEL
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