MD-11 Flight Crew Operations Manual
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Communications -
Description and Operation
Comm.10.3
Flight interphone transmission may be accomplished by using any of the
following:
• The radio Push To Talk (PTT) switch on the outboard horn of either
control wheel with INT MIC selected.
• The INT switch on the ACP.
• The PTT switch on each hand microphone with INT MIC selected.
• Radio PTT switches, one each on the Captain and First Officer's lighting
control panels with INT MIC selected on the ACP.
The cockpit speakers are muted as follows:
• Keying the Captain’s hand, boom, or mask microphone for radio or
interphone mutes the Captain’s speakers.
• Keying the First Officer’s hand, boom, or mask microphone for radio or
interphone mutes the First Officer’s speakers.
• Keying any microphone or cockpit handset for PA mutes both the
Captain’s and the First Officer’s speakers.
• Keying any microphone or cockpit handset for service interphone does
not mute the speakers.
• Keying the Observer’s hand, boom, or mask microphone for radio or
interphone does not mute the Captain’s or First Officer’s speakers.
Service Interphone/Call System
The service interphone/call system allows communications between the cockpit
and cabin attendant stations and between the cockpit and maintenance service
areas.
The service interphone/call panel is installed on the forward overhead panel in the
cockpit.
Nine PA/service interphone handsets are installed in the airplane, one in the
cockpit on the aft pedestal and one at each cabin attendant station.
The following service interphone operations are possible through the handset:
• The cockpit can call either a selected cabin attendant station, all cabin
attendant stations or the maintenance service area.
• Each cabin attendant station can call a selected cabin attendant station or
the cockpit.
Maintenance interphone jacks are located at various locations on the airplane.
These jacks permit communications between these areas and the cockpit.
The call system consists of call lights, aural signals, and call switches which
provide both visual and/or aural signals that do the following:
• Alert the flight crew of a call from the cabin attendant station or ground
maintenance.
October 02, 2006
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