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.
5.20.4 D6-27370-866-EGP
External jacks for use by maintenance or service personnel can be added to the
system by use of the service interphone switch.
Passenger Address System
The passenger address (PA) system allows flight deck crewmembers and flight
attendants to make announcements to the passengers. Announcements are heard
through speakers located in the cabin and in the lavatories.
The flight deck crewmembers can make announcements using a PA handset or by
using any standard microphone and the related ACP. Flight Attendants make
announcements using PA handset located at their stations. The attendants use the
PA to play recorded music for passenger entertainment.
PA system use is prioritized. Flight deck announcements have first priority and
override all others. Flight Attendant announcements override the music system.
Call System
The call system is used as a means for various crewmembers to gain the attention
of other crewmembers and to indicate that interphone communication is desired.
Attention is gained through the use of lights and aural signals (chimes or horn).
The system can be activated from the flight deck, either flight attendant station, or
from the external power receptacle. Passengers may also use the system to call an
attendant, through the use of individual call switches at each seat.
The flight deck may be called from either flight attendant station or by the ground
crew. The ground crew may only be called from the flight deck. Flight Attendants
may be called from the flight deck, the other attendant station, or from any
passenger seat or lavatory. Master call lights in the passenger cabin identify the
source of incoming calls to the attendants.
Call system chime signals are audible in the passenger cabin through the PA
system speakers. The PA speakers also provide an alerting chime signal whenever
the NO SMOKING or FASTEN SEAT BELT signs illuminate or extinguish.
September 24, 2015
To Next Page
Loading...
