737 Flight Crew Operations Manual
Communications -
Controls and Indicators
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5.10.10 D6-27370-866-EGP
4 Communication Jacks
Used for appropriate microphone or headphone plugs.
5 Push–To–Talk Switch
MIC (microphone) –
• selects oxygen mask or boom microphone for transmission, as selected
by ACP transmitter selector.
• same as using ACP PTT switch (R/T position).
OFF – center position.
INT (interphone) –
• selects oxygen mask or boom microphone for direct transmission over
flight interphone
• bypasses ACP transmitter selector
• same as using ACP PTT switch (I/C position)
6 Push–To–Talk Switch
Push – keys hand microphone for transmission, as selected by ACP transmitter
selector.
Glareshield Microphone Switch
1 Glareshield MIC Switch
Push - allows oxygen mask or boom microphone transmission on the selected
transmitter.
September 15, 2016
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