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D6-30151-425 5.20.3
Aircraft Communication Addressing and Reporting System
(ACARS)
ACARS data and voice modes provide automatic and manual means to transmit
and receive operational, maintenance, and administrative information between the
airplane and a ground station. ACARS is operational when electrical power is
established and is accessed by selecting the ACARS prompt on the CDU main
menu.
ACARS communicates through either VHF C or SATCOM.
If ACARS is not available due to lost communication, information to be
transmitted is stored and transmitted automatically when communication is
regained.
VHF C data mode can be selected and deselected by pushing the frequency
transfer switch on the radio tuning panel. VHF C is in the data mode when the
word ACARS is displayed in the radio tuning panel active frequency window.
If the data mode is deselected, ACARS is still operational and an ACARS failure
may cause interference with voice operation of the radio. Therefore, ATC voice
communication on VHF C is prohibited.
Satellite Communications (SATCOM)
The SATCOM system provides ACARS data communications.
ACARS uses the SATCOM system when the airplane is beyond VHF
communication range. Switching between VHF and SATCOM is automatic.
ACARS data is controlled through the control display units (CDUs).
The SATCOM system also provides voice communications. Voice transmission is
controlled using the CDUs and audio panels. Calls can be initiated using the CDU.
The SATCOM CDU control pages display by selecting SAT on the MENU page.
Selective Calling (SELCAL)
The SELCAL system monitors the VHF and HF radios.When the system receives
a call from a ground station, the related radio CALL light illuminates and a chime
sounds. The CALL light is reset by selecting the related transmitter selector, or
transmitting on that radio.
CDU Menu Page
Pushing the CDU MENU key displays the CDU menu page.
CDU ACARS and SATCOM Access
Normally, ACARS and SATCOM displays are viewed on the center CDU.
ACARS and SATCOM prompts are available on the menu page of all CDUs.
April 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
5.20.4 D6-30151-425
Communications -
System Description
1 ACARS
Push –
• displays ACARS page
• activates ACARS control of CDU
2 SAT
Push –
• displaysSATCOMpage
• activates SATCOM control of CDU
A C M S
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CDU
December 01, 1999
747 Operations Manual
Communications Chapter 5
Interphone Systems Section 30
Copyright © The Boeing Company. See title page for details.
D6-30151-425 5.30.1
Interphone Communication System
The interphone communication system includes the:
• flight interphone system
• cabin interphone system
• passenger address (PA) system
• service interphone system.
The flight interphone, service interphone, and PA systems are normally operated
through the audio select panel.
The cabin interphone is operated through the audio panel or flight deck handset.
Flight Interphone System
The flight interphone system provides communications between flight deck crew
members.The flight interphone system also provides communications between the
flight deck and ground crew through the flight interphone jack in the nose landing
gear wheel well.
The system is used by selecting the INT (interphone) position on a control wheel
switch or on an audio panel Push-to-Talk (PTT) switch. The interphone can also
be used by selecting the FLT transmitter selector on an audio panel and then
selecting one of the following:
• the R/T position of an audio panel PTT switch
• the MIC position of a control wheel switch
• the PTT position of a hand microphone switch
Crew alerting of a ground crew initiated call is provided by an aural alert chime
and illumination of the FLT call indication. The call indication is reset by selecting
the FLT transmitter selector or transmitting on that transmitter. The call indication
is also reset after a 30 second delay. The ground crew is called by selecting P-1 on
the interphone panel.
Service Interphone System
The service interphone system provides voice communications between ground
crew stations at various locations around the airplane. The system can be
connected to the flight interphone system through the service interphone switch
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