MD-11 Flight Crew Operations Manual
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Communications -
Description and Operation
Comm.10.8
• The MU automatically locks in either VHF3 or SATCOM, as appropriate.
• VHF3 or SATCOM can be manually selected through the ACARS screen
on the MCDU.
SATCOM communication is possible when the airplane is within range of satellite
coverage and SATCOM transmission is enabled.
VHF communication is possible when the airplane is within range of a network
ground station and VHF transmission is enabled. Typical VHF range is
approximately 200 NM at 30,000 feet.
During VHF communication, the radio transceiver is tuned to a frequency entered
on the MCDU or by a ground station uplink frequency command. Voice mode or
data mode VHF transmission is selected through the MCDU or the ground station.
When in voice mode, the appropriate alert is displayed.
The MU starts contact by transmitting when the flight crew wants to transmit, or
when a predefined event occurs. The MU only transmits when the selected
channel is available. If the transmission is not received (by the ground station),
ACARS attempts to transmit again. After 6 attempts, if the message is not
received, the flight crew receives an ACARS NO-COMM alert. The same process
occurs for uplink messages.
Cockpit Entry Video System (CEVS)
Cockpit Entry Video System provides means to identify persons requesting entry
to the cockpit and to detect suspicious behaviour of persons in the vicinity of the
flight deck.
CEVS consists of 4 video cameras, 1 control panel and 1 Video Display Unit
(DU).
The system is activated by switching the Power switch to the ON position. Within
5 seconds the image from the selected camera will show on the DU. To select a
camera view for display, the View selector must be rotated for any desired
position.
The STBY button can be used to switch off the DU backlight (sleep mode). The
DU backlight will remain off until any input is generated on the control panel.
Using the sleep mode will lengthen the service life of the DU.
The system will be powered by 28 VDC Bus 2.
November 10, 2008
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