MD-11 Flight Crew Operations Manual
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Communications -
Description and Operation
Comm.10.6
When the call is acknowledged, the system is automatically reset by pushing the
MIC/CALL light on the ACP and keying the radio PTT on the associated control
wheel, or ACP.
The radio volume control knobs on the ACP permit volume control of the
receivers without affecting SELCAL system operation. In the event the SELCAL
system fails, the VHF and the HF communications systems continue to operate
normally.
Cockpit Voice Recorder
The solid state Cockpit Voice Recorder (CVR) records the last 120 minutes of:
• Interphone and radio communication from all three cockpit stations via
the Audio Management Units.
• All passenger Address System announcements via the PA amplifier.
• All cockpit conversations picked up by the cockpit area microphone.
The recorder runs automatically when aircraft is powered. The Cockpit Voice
Recorder panel is located on the overhead panel.
Satellite Communications (SATCOM)
The Satellite Communications (SATCOM) system provides air/ground voice and
data communication. The system uses satellites (via SATCOM antenna) and
ground stations to relay transmissions to and from the airplane. The Satellite Data
Units (SDU) on board the airplane process signals from antennas and interface
with the Multifunction Control Display Unit (MCDU), ACARS, Audio
Management Unit (AMU), and Cabin Telecommunication Unit (CTU).
Operation of the SATCOM requires the Inertial Reference System (IRS) to be
powered-on and aligned. It takes ten minutes for the IRS to become aligned from
power on.
Voice communication is available. The flight crew can receive or initiate a call in
the cockpit. A single stroke chime accompanied by a flashing TEL light on the
ACP indicates an incoming call to the airplane. The flight crew acknowledges the
call by pushing the MIC/TEL switch on the ACP. The flight crew initiates a call
by entering a phone number on the MCDU prior to pushing the MIC/TEL switch.
November 10, 2008
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