Page 19 - ITU-T Focus Group on Aviation Applications of Cloud Computing for Flight Data Monitoring - Use cases and requirements

ITU-T Focus Group on Aviation Applications of Cloud Computing for Flight Data Monitoring
Use cases and requirements

ACMS report example

3.4 Central maintenance computer (CMC)

The central maintenance computer (CMC) is used to facilitate maintenance tasks by directly indicating the
fault messages in the cockpit, and allowing some specific tests. It includes the built-in test equipment (BITE)
of all electronic systems and there are always two redundant CMCs, one for use and the other on standby in
case of emergency/failure of the first one. The communications management unit (CMU) operates in two main
modes: the normal or reporting mode (in-flight) and the interactive or menu mode (on ground). In the normal
mode, CMS records and permanently displays the failure messages transmitted by each system of BITE. In the
interactive mode, CMS allows the connection of any BITE system with MCDU, in order to initiate a test, or to
display the maintenance data stored and formatted by the systems BITE. CMC messages are routed through
ACARS for transmission to the ground for scrutiny and action.

Example of a CMC/fault detection and exclusion (FDE) message

QU xxxxxx
.xxxxxxx 160855

_CFD

FI xxxxx/AN xx-xxxx

DT xxx IOR2 160855 C03A

- PLF 1 16APR15 0852 xxxxxxx xxxxx SZBAP/WMKK 3110-BCG-00W-12 L 0133 16APR15
FDE 21507241 A 0133 16APR15

MSG 2124101 L 0133 16APR15 ES M PL

DB CABIN TEMPERATURE CONTROLLER (L CHAN2)
DB CABIN TEMPERATURE CONTROLLER (L CHAN1)

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