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Note: Right radio tuning panel HF SENS control operative only when right HF
radio installed. Center radio tuning panel HF SENS control inoperative.
4 Radio Tuning Panel (PNL) OFF Switch
Push – disconnects panel from communication radios.
5 Radio Tuning Panel OFF Light
Illuminated (white) – radio tuning panel is disconnected from communication
radios.
6 AM Switch
Push – sets AM (amplitude modulation) or USB (upper side band) mode for
selected HF.
7 Frequency Transfer Switch
Push –
• transfers STANDBY window frequency to ACTIVE window and tunes
selected radio to new active frequency
• transfers ACTIVE window frequency to STANDBY window.
April 01, 2001
747 Operations Manual
Communications -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.5
8 STANDBY Frequency Window
Displays preselected or previously tuned frequency of selected radio.
Displays ACARS on VHF C when selection of the frequency transfer switch
would reconfigure VHF C to the data mode.
9 Frequency Selector
Rotate – to set frequency in the STANDBY window:
• outer knob – selects the portion of the frequency to the left of the decimal
point
• inner knob – selects the portion of the frequency to the right of the
decimal point.
10 Radio Tuning Switches
Push –
• selects radio to be tuned
• tuned frequency displays inACTIVE frequency window
• standby frequency displays in STANDBY frequency window.
Note: Selection of VHF C inhibits ACARS operation.
11 Radio Tuning Lights
Illuminated (white) – indicates selected radio.
12 AM Light
Illuminated (white) – HF AM selected.
Extinguished – HF USB is selected.
Miscellaneous Communication Controls
Flight Deck Speaker
UPPER SIDE PANELS
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.6 D6-30151-425
Communications -
Controls and Indicators
1 Flight Deck Speaker
Controlled by speaker volume control on related audio control panel.
Headphone/Boom Microphone
1 Headphone
Used to monitor audio from related audio control panel.
Audio volume adjusted using audio control panel controls for the related station.
Available at all four flight deck stations.
2 Boom Mic
Activation of a control wheel, glareshield, or audio control panel mic/interphone
switch transmits on the system selected for use at that station.
(Typical)
SIDEWALL PANELS
1
2
December 01, 1999
747 Operations Manual
Communications -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.7
Hand Microphone
1 Hand Microphone Push–To–Talk Switch
Push – activates hand microphone.
2 Hand Microphone
Transmits on system selected by audio control panel.
Oxygen Mask Microphone
(Typical)
SIDEWALL PANELS
1
2
(Typical)
SIDEWALL PANELS
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.8 D6-30151-425
Communications -
Controls and Indicators
1 Oxygen Mask Microphone
Enabled when oxygen mask doors open. Boom microphone is disabled.
Activation of a control wheel, glareshield, or audio control panel mic/interphone
switch transmits on the system selected for use at that station.
Control Wheel Microphone/Interphone Switch
1 Control Wheel Mic/Interphone Switch
MIC – allows oxygen mask or boom microphone transmission on selected
transmitter. Spring loaded to center.
CENTER – off position.
INT – allows oxygen mask or boom microphone transmission on flight interphone
system. Spring–loaded to center.
INT
MIC
1
CONTROL WHEELS
December 01, 1999
747 Operations Manual
Communications -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.9
Service Interphone Switch
1 Service Interphone (SERV INT) Switch
OFF – allows independent operation of service and flight interphone systems.
ON – connects service and flight interphone systems.
Observer Audio System Switch
1 Observer (OBS) AUDIO SYSTEM Switch
Allows Captain or First Officer to use Observer’s audio panel.
CAPT - connects Observer’s audio panel to Captain’s:
• handmic
• boom mic/headset
　
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