You use the multifunction control display unit (MCDU) to control the operation of the ACARS and to show ACARS messages.
The ACARS aircraft personality module (APM) identifies the airplane.
The ACARS CMU receives the ground-to-air digital messages (uplink) and controls the transmission of the air-to-ground digital messages (downlink).
ACARS connects to these components of other systems:
-VHF transceiver #3 to transmit to and receive data from the ground. -Proximity switching unit sends door status, parking brake set, and air/ground sense. (737-700 ONLY) -Misc solid-state switching module sends discrete signals for out, off, on and in (OOOI) events. (737-300/500 ONLY) -E11 sends discrete signals for parking brake set and air/ground sense. (737-300/500 ONLY)
-Flight management computer can supply the ACARS with aircraft position, fuel quantity, software load, and uplink flight plans to the FMC or down link flight plans from the FMC.
SWACOM TRAINING GUIDE
ACARS also connects to these systems to upload information from the airline operations or download information to the airline operations:
-Flight data acquisition unit
-Data base loader

December 1, 2004
23-27
- 4 -
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
SWACOM TRAINING GUIDE

COMMUNICATION MANAGEMENT UNIT
ACARS - GENERAL DESCRIPTION
December 1, 2004 - 5 -

23-27
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved

23-27-AC-002
SOUTHWEST AIRLINES.

ACARS - GENERAL DESCRIPTION General
The ACARS is a data communication system to manage flight plan data and maintenance data between the airplane and the airline.
These are the components of the ACARS:
-Multifunction control display units (MCDU)
-Aircraft personality module (APM)
-Communication management unit (CMU).

You use the multifunction control display unit (MCDU) to control the operation of the ACARS and to show ACARS messages.
The ACARS aircraft personality module (APM) identifies the airplane.
The ACARS CMU receives the ground-to-air digital messages (uplink) and controls the transmission of the air-to-ground digital messages (downlink).
ACARS connects to these components of other systems:
-VHF transceiver #3 to transmit to and receive data from the ground. -Proximity switching unit sends door status, parking brake set, and air/ground sense. (737-700 ONLY) -Misc solid-state switching module sends discrete signals for out, off, on and in (OOOI) events. (737-300/500 ONLY) -E11 sends discrete signals for parking brake set and air/ground sense. (737-300/500 ONLY)
-Flight management computer can supply the ACARS with aircraft position, fuel quantity, software load, and uplink flight plans to the FMC or down link flight plans from the FMC.
　
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