EE COMPARTMENT E3 EE COMPARTMENT E2 (LOOKING AFT) (LOOKING LEFT)
NOTE: THE CMU ON SOME OUR 737-300’S ARE LOCATED ON THE E2-2 SHELF.
ACARS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
23-27-AC-004
December 1, 2004
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
SWACOM TRAINING GUIDE
ACARS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS Electronic Equipment Compartment
737-300/500
The ACARS Communication Management Unit (CMU) and VHF VDR transceiver 3 (ACARS ONLY) is located on the E2-1 shelf. Mounted on the tray behind the CMU, is found the Aircraft Personality Module (APM)
NOTE: The CMU on some of our 737-300’s are located on the E2-2 shelf.
737-700
The ACARS Communication Management Unit (CMU) and VHF VDR transceiver 3 (ACARS ONLY) is located on the E3-3 shelf. Mounted on the disconnect rack behind the CMU, is found the Aircraft Personality Module (APM).
December 1, 2004
23-27
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
SWACOM TRAINING GUIDE
737-700 737-300/500
E3-3 SHELF E2-1 SHELF
- ACARS COMMUNICATION MANAGEMENT UNIT (CMU)
- VHF VDR TRANSCEIVER 3 (ACARS ONLY) - AIRCRAFT PERSONALITY MODULE (APM)
(ON TRAY BEHIND CMU) - VHF VDR TRANSCEIVER 3 (ACARS ONLY)
-
ACARS COMMUNICATION MANAGEMENT UNIT (CMU)
-
AIRCRAFT PERSONALITY MODULE
(ON DISCONNECT RACK BEHIND CMU)
EE COMPARTMENT E3 EE COMPARTMENT E2 (LOOKING AFT) (LOOKING LEFT)
NOTE: THE CMU ON SOME OUR 737-300’S ARE LOCATED ON THE E2-2 SHELF.
ACARS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATIONS
23-27-AC-004
December 1, 2004
23-27
- 15 -
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
ACARS - COMMUNICATIONS MANAGEMENT UNIT Purpose
The Communication management unit (CMU) receives the uplink data and controls the transmission of downlink data to and from the VHF transceiver number 3.
General
The CMU does these tasks:
-Monitors input signals
-Formats downlink messages
-Monitors downlink data to make sure it is correct
-Monitors uplink messages to make sure they are correct
-Decodes uplink messages
-Controls the mode of operation
-Controls data transmission
-Gives acknowledged/not acknowledged response
-Tunes and controls a VHF radio number 3
-Monitors system operation.
The CMU processes only uplink messages that come with the airplane registration code. This same code also goes on all downlink messages to identify the airplane.
Description
The following indicators and controls are located on the front of the CMU:
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