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Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.10.15
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December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.10.16 D6-30151-425
Communications -
Controls and Indicators
Intentionally
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October 1, 2000
747 Operations Manual
Communications Chapter 5
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.20.1
Introduction
The communication system includes:
• radio communication system
• cockpit voice recorder system
• interphone communication system
• SATCOM communication system
• ATC data communication system
• company data communication system
The radio tuning and audio panels control the communications systems.
Audio Panels
The audio panels control radio and interphone communication systems.
Navigation receiver audio can also be monitored.
The captain, first officer, and first observer audio control panels are installed on
the aft aisle stand.
The second observer audio panel is installed on the sidewall panel.
Microphones are keyed by pushing the desired audio panel transmitter select
switch and then selecting one of the following:
• the MIC position of a control wheel switch
• the R/T position of an audio panel Push-to-Talk (PTT) switch
• the PTT position of a hand microphone switch
Systems are monitored using headphones or speakers.
An oxygen mask microphone is enabled and the boom microphone is disabled
when the oxygen mask left stowage door is open. The oxygen mask microphone
is disabled and the boom microphone is enabled when the left oxygen mask
stowage box door is closed and the RESET/TEST lever is pushed.
Cockpit Voice Recorder System
The cockpit voice recorder records any transmissions from the flight deck made
through the audio control panels. It also records flight deck area conversations
using an area microphone. All inputs are recorded continuously.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.20.2 D6-30151-425
Communications -
System Description
Radio Tuning Panels
The radio tuning panels tune the VHF and HF radios. The panels are designated
left, center, and right, and are normally associated with the related VHF and HF
radios.
If a radio tuning panel fails, the panel can be disconnected from the
communication radios using the Off switch.
An offside tuning indicator on each radio tuning panel indicates one of the
following conditions when illuminated:
• the panel is selected to a radio normally associated with another radio
tuning panel
• a communication radio not normally associated with that radio tuning
panel has been selected and may be tuned by another radio tuning panel
• another radio tuning panel is off
Radio Communication System
The radio communication system consists of:
• Very High Frequency (VHF)
• High Frequency (HF)
• Aircraft Communication Addressing and Reporting System (ACARS)
• Selective Calling (SELCAL)
• Satellite Communications (SATCOM)
VHF and HF
There are three independent VHF radios (VHF L, C, R) and two independent HF
radios (HF L, R). Any VHF or HF radio can be controlled by any radio tuning
panel. The audio panels control voice transmission and receiver monitoring.
VHF L and VHF R are configured for voice communication only. VHF C can be
configured for voice or ACARS data communication. Normally, VHF C is
configured for ACARS data communication.
HF radio sensitivity can only be adjusted using the on–side radio tuning panel.
Sensitivity control is not affected by radio tuning panel status. When an HF
transmitter is keyed after a frequency change, the antenna tunes. While the
antenna is being tuned, a steady or intermittent tone can be heard through the
audio system (tuning takes a maximum of 15 seconds).
Stuck Mic Protection
On the ground, any VHF radio transmitting more than 35 seconds is disabled and
dashes appear in the tuning panel frequency window. The radio is enabled when
the microphone switch for that radio is released.
December 01, 1999
747 Operations Manual
Communications -
System Description
Copyright © The Boeing Company. See title page for details.
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