737 MAX Flight Crew Operations Manual
Communications -
Controls and Indicators
MN-FLT-OH-201
5.10.13
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)
1B785, 1B786, 1J585 - 1J594
• locks in INT position until selected to either OFF or MIC.
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.
MIC
1
GLARESHIELD PANEL
October 26, 2021