.
printer door is open or

.
self-test has failed.

POWER (PWR) Light
Illuminated (white) - unit is powered.

POWER (PWR) Switch
Push -alternately removes and applies power to printer.
Copyright . The Boeing Company. See title page for details.
Communications -Controls and Indicators
737 Flight Crew Operations Manual
Miscellaneous Communication Controls (Typical)
6
OVERHEAD SPEAKER HAND MICROPHONE
1
(AS INSTALLED) BOOM MICROPHONE/HEADSET
OXYGEN MASK MICROPHONE
HEADPHONES
2
3
4
BOOM MIKE HEAD PHONE HAND MIKE
MIC
5
INT
(VIEW FROM BELOW)
FLIGHT DECK CREW STATIONS
1 Overhead Speaker
Monitors audio from related pilot’s ACP.
2 Headset or Headphones
 Monitors audio from related ACP.
Copyright . The Boeing Company. See title page for details.
5.10.22  June 1, 2005

Communications -Controls and Indicators 737 Flight Crew Operations Manual

Standard Microphones
YA626, YA721 - YA809, YC411 - YK104
Choose desired microphone for voice transmission through selected radio,
interphone system, or passenger address (PA).

YA613, YA686, YA687, YC153, YC154
Choose desired microphone for voice transmission through selected radio,
interphone system, or passenger address (PA). The oxygen mask microphone is
automatically activated when the mask is removed from the mask stowage box.

Communication Jacks
Used for appropriate microphone or headphone plugs.

Push–To–Talk Switch YA626 - YK104
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)
YA686, YA687

.
locks in INT position until selected to either OFF or MIC.

Push–To–Talk Switch YA613
MIC (microphone) –
.  
selects oxygen mask or boom microphone for transmission, as selected by
ACP transmitter selector.

.
same as using ACP PTT switch (RADIO 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 (INT position)

Copyright . The Boeing Company. See title page for details.
Communications -Controls and Indicators 737 Flight Crew Operations Manual

Push–To–Talk Switch
Push – keys hand microphone for transmission, as selected by ACP transmitter selector.
Copyright . The Boeing Company. See title page for details.
5.10.24  June 1, 2005

Communications -Controls and Indicators 737 Flight Crew Operations Manual
Glareshield Microphone Switch YC153, YC154, YD651 - YK104

Glareshield MIC Switch
Push - allows oxygen mask or boom microphone transmission on the selected transmitter.
Copyright . The Boeing Company. See title page for details.
Communications -Controls and Indicators

Interphone and Passenger Address Controls

SERVICE INTERPHONE Switch
OFF –
.
external jacks are deactivated

.
communication between flight deck and flight attendants is still possible. ON – adds external jacks to service interphone system.

Service INTERPHONE Handset Jack
With microphone installed, used to communicate with flight attendant stations:
.  
with SERVICE INTERPHONE switch ON, also used to communicate
with any external jack location

.
bypasses ACP.

Copyright . The Boeing Company. See title page for details.
5.10.26   June 1, 2005

Communications -Controls and Indicators 737 Flight Crew Operations Manual

Passenger Address (PASS ADDRESS) Hand Microphone Jack
With microphone installed:
.
used to make PA announcements

.
bypasses ACPs.

INTERPHONE FLIGHT Jack
 Connects ground crew to flight interphone system.

Flight Deck / Attendant PA Hand Microphone
Used to make PA announcements.
Cockpit Voice Recorder
　
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