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on the overhead panel.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.30.2 D6-30151-425
Communications -
Interphone Systems
Passenger Address System
The passenger address (PA) system is used by the flight crew to make cabin
announcements.The PA system is accessed using the boom microphone, or
oxygen mask microphone, or hand microphone, or the pilot’s interphone handset
located behind the aisle stand.
The system is monitored by pushing the PA receiver volume control on an audio
control panel. The PA system can also be selected through the cabin interphone
system or the flight deck handset.
The boom or oxygen mask microphone is used by selecting the PA transmitter
selector and using the R/T position of a push-to-talk switch. The hand microphone
is also used with the PA transmitter selected. The system is monitored by selecting
the PA receiver selector/volume control.
Cabin PA announcement priorities are:
• flight deck announcements from an audio control panel
• cabin handset direct access announcements
• priority (all area) announcements
• normal announcements from flight attendant or flight deck handsets.
Cabin Interphone System
The cabin interphone system provides voice communications between the flight
deck and the flight attendant stations.
The cabin interphone system is accessed by using the boom microphone, or
oxygen mask microphone, or hand microphone, or the pilots’ interphone handset
located behind the aisle stand.
The boom or oxygen mask microphone is used by selecting the CAB transmitter
selector and using the R/T position of a push-to-talk switch. The hand microphone
is also used with the CAB transmitter selected. The system is monitored by
selecting the CAB receiver selector/volume control.
Selecting the CAB transmitter selector or removing the pilots’ interphone handset
from the hook activates the interphone panel. The interphone panel is used to
select the desired station to be called.
Interphone system calls from the flight deck to attendant stations are prioritized
according to the code dialed (PA announcements, Priority 33, ALL CALL, and
station to station). A higher priority call will override and disconnect a lower
priority call.
December 01, 1999
747 Operations Manual
Communications -
Interphone Systems
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.30.3
A priority line can be established only to the primary station (normally primary
DR 1L), by dialing 33 or pushing the CAB transmitter selector on the audio panel
twice within three seconds. This action also joins an existing priority call between
the primary and alternate station.
Any station may call the flight deck on Pilot Alert and override a Priority call but
not a PA announcement.
Calls may be transferred to any other station by dialing the code of the station the
call is to be transferred to and then hanging up. Up to four stations may be
connected in a conference call by dialing the station to be added.
Flight attendants desiring communication with the flight deck use the flight
attendant handsets. The incoming call illuminates the CAB call indication on the
audio panel, displays the location of the calling station on the interphone panel,
and sounds a chime.
The CAB call indication is reset by selecting the related transmitter selector, or
transmitting on that transmitter. The call indication is also reset by picking up the
pilots’ interphone handset.
The flight deck can receive up to three incoming calls at the same time fromcallers
using dial code 31.With a call in progress, up to two additional callers may access
the same line and PARTY LINE displays on the flight deck interphone panel.
When more than three calls are made to the flight deck at the same time from
callers using dial code 31, the additional callers get a busy signal and the caller’s
location is stored.
When calls are stored, the interphone panel displays a “W” followed by the
number of stored calls. After completing the call, stored locations can be reviewed
with the NEXT switch on the interphone panel.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.30.4 D6-30151-425
Communications -
Interphone Systems
Intentionally
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October 1, 2000
747 Operations Manual
Communications Chapter 5
ATC Datalink Section 33
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.33.1
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