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• headphone
• oxygen mask mic
• speaker
• push-to-talk switches.
ON
OFF
SERV INT
OVERHEAD PANEL
1
CAPT F/O
NORM
OBS AUDIO SYSTEM
OVERHEAD PANEL
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.10 D6-30151-425
Communications -
Controls and Indicators
NORM - audio panel normal operation.
F/O - connects Observer’s audio panel to First Officer’s:
• handmic
• boom mic/headset
• headphone
• oxygen mask mic
• speaker
• push-to-talk switches.
Handset
Handset provides communication with other handsets orPA system.
1 PA Push-to-Talk Switches
Push – in PA mode connects handset mic to selectedPA area.
T T
P R
T
P
T
AFT AISLE STAND
1
2
December 01, 1999
747 Operations Manual
Communications -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.11
2 Reset Switch
Push _ cancels call.
1 Interphone Keys
Push – selecting two digit code calls related station or PA area.
2 PA Push-to-Talk Switches
Push – in PA mode connects handset mic to selectedPA area.
3 Reset Switch
Push – cancels call or incorrectly selected code.
Interphone Panel
Provides control for either PA (passenger address) or CAB (cabin) interphone
communications using either the handset or an audio panel.
P
T
3
T
P
T
T P
R
4 5 6
1 2
FLIGHT ATTENDANTS’ PANELS
1
2
3
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.12 D6-30151-425
Communications -
Controls and Indicators
1 Next (NXT) Switch
Push –
• reviews stored call locations
• when no other calls, scrolls through directory.
2 Interphone Switches
Push -
• selecting two digit code calls related station orPA area
• speak by selecting CAB (cabin) transmitter switch on audio panel or
handset.
3 Reset (RST) Switch
Push - cancels call or incorrectly selected code.
4 Interphone Station Indicator
Indicator displays:
• location and code of station calling or being called
• number of stored call locations
• station code and location when reviewing directory or other calls to the
flight deck.
Other interphone panel displays are:
• CABINREADY
• PA IN USE
• PILOT ALERT
• VIDEOINUSE
• PARTY LINE
Note: Interphone directory located on handset. Light sensor adjusts intensity of
interphone station indicator.
1 2 5
NXT RST
3 4 6 P
1
2
3
4
AFT AISLE STAND
December 01, 1999
747 Operations Manual
Communications -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.13
Cockpit Voice Recorder System
Cockpit Voice Recorder Panel
1 Monitor Indicator
2 TEST Switch
Push - tests all four channels.
3 ERASE Switch
Push and hold for three seconds – erases voice recorder if on the ground, AC
power on, and parking brake set.
4 Cockpit Voice Recorder Headset Jack
A headset can be plugged in to monitor playback of voice audio, or monitor tone
during test.
Cockpit Voice Recorder Microphone
OVERHEAD MAINTENANCE PANEL
3
2
1
4
TEST ERASE
HEADSET
COCKPIT VOICE RECORDER
600 OHMS
(Typical)
OVERHEAD PANEL
1
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.14 D6-30151-425
Communications -
Controls and Indicators
1 Cockpit Voice Recorder Microphone
Area microphone for the voice recorder.
Printer Controls
1 SLEW Switch
Push and hold - advances paper.
2 RESET Switch
Push - resets Message (MSG) light.
3 TEST Switch
Push –
• tests printer
• when pushed with RESET switch, prints test pattern.
4 PAPER Indicator
Indicates amount of paper in printer.
SLEW RESET TEST MSG PAPER FAIL
FULL
DATA PRINTER
PAPER
EMPTY
1
2
3
4
AFT AISLE STAND
5
6
7
December 01, 1999
747 Operations Manual
Communications -
Controls and Indicators
　
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