MD-11 Flight Crew Operations Manual
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Communications Chapter Comm
Description and Operation Section 10
Comm.10.1
Comm.10 Communications-Description and Operation
General
The MD-11communications system consists of the following:
• VHF communications system.
• HF communications system.
• Communication Radio Panels (CRP).
• Audio Control Panels (ACP).
• Flight interphone system.
• Service interphone/call system.
• Passenger address (PA) system.
• Selective Calling System (SELCAL).
• Cockpit Voice Recorder (CVR) system.
• Satellite Communications (SATCOM) system.
• Aircraft Communications Addressing And Reporting System (ACARS).
• Cockpit Entry Video System (CEVS)
Static dischargers on the trailing edges of the wing and tail surfaces dissipate static
electricity that could interfere with communications and navigation. The wingtip
and winglet dischargers also protect the aft wingtip lenses from lightning strike.
VHF Communications System
The VHF communications system consists of three separate, identical systems,
designated VHF1, VHF2 and VHF3.
All of the three systems operate separately or simultaneously. The systems
provide short-range line-of-sight communications in the 118.000 to 136.975-MHz
frequency range. This allows communications between the airplane and ground
and/or other airplanes.
The selection for the VHF communications system is controlled from any of three
Communication Radio Panels (CRP).
HF Communications System
The HF communications system consists of two separate, identical systems,
designated HF1 and HF2.
The systems provide long range communications between the airplane and ground
and/or other airplanes in the 2.000 to 29.9999 MHz in wide range on channels
spaced at 1.0 KHz.
November 10, 2008
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