737 Flight Crew Operations Manual
Communications -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 5.20.3
YK981 - YQ456
The mask and boom microphones can be used for transmission on the usable
radio. The mask and boom microphones can be keyed with the control wheel PTT
switch MIC position or the ACP PTT switch R/T position. The hand microphone
is not usable in the degraded mode of operation.
Audio warnings for altitude alert, GPWS, and windshear are not heard on an audio
system operating in the degraded mode.
An audio system operating in the degraded mode cannot access the passenger
address system through the audio control panel. The crewmember can still use the
service interphone handset and PA microphone if they are installed on the control
stand.
Flight Interphone System
The flight interphone system is an independent communication network. Its
primary purpose is to provide private communication between flight deck
crewmembers without intrusion from the service interphone system. The ground
crew may also use the flight interphone through a jack at the external power
receptacle.
The pilots can transmit directly over the flight interphone by using the control
wheel or glareshield PTT switches. Alternately, any crewmember with an ACP
can transmit/receive over the flight interphone by using their related ACP and
normal PTT switches. Any standard microphone may be used with the flight
interphone system.
Service (Attendant) Interphone System
The service interphone system provides intercommunication between the flight
deck, Flight Attendants, and ground personnel. Flight deck crewmembers
communicate using either a separate handset (if installed) or their related ACP and
any standard microphone.
The Flight Attendants communicate between flight attendant stations or with the
flight deck using any of the attendant handsets. Anyone who picks up a
handset/microphone is automatically connected to the system.
CREW STATION AUDIO SYSTEM IN
DEGRADED MODE
RADIO AVAILABLE FOR
TRANSMISSION AND RECEPTION
AT DEGRADED STATION
CAPTAIN VHF–1
FIRST OFFICER VHF–2
OBSERVER VHF–1
September 15, 2016
To Next Page
Loading...
