*
CMCF options display on the MAT

*
Fault table software inhibits in the data tables.

Shop Faults
The CMCF shop faults sub-function supplies a way for maintenance personnel to show and to report shop fault data stored in LRUs and LRMs, including the AIMS functions.

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CMCS -FUNCTIONAL DESCRIPTION

Shop fault data is a combination of LRU maintenance information and failure information that the LRU detects by BITE. The LRU stores the maintenance and failure information in non-volatile memory (NVM) for use during shop maintenance.
The CMCF supplies access to the shop faults data on the MAT.
Airline Modifiable Information

These are the types of data which the airline modifiable information (AMI) supplies for the CMCF:
*
Help text for CMCF dialog boxes and displays

*
The types of reports available

*
Event triggers for automatically generated reports

*
Tail number cross reference table which gets the specific tail number associated with the received international civil aviation organization (ICAO) number from the ATC transponder.

Report Generation

The CMCF report generation sub-function processes requests for CMCF reports from:
*
The MAT dialog boxes or displays

*
The PMAT dialog boxes or displays

*
A ground station via datalink

*
The flight deck communication function (FDCF)

*
The MAT disk drive.

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The CMCF also generates event triggered reports. The CMCF generates reports of the requested data and transmits the data to:
*
The flight compartment printer

*
A ground station

*
The MAT disk drive

*
The PMAT disk drive.

The print driver sub-function in the data communication management function (DCMF) receives the CMCF report data for the flight deck printer. The ACARS datalink sub-function in the DCMF receives the CMCF report data for transmission to a ground station. The OLAN sub-function in the DCMF receives the CMCF report data for transmission to the MAT and PMAT over the AVLAN.
The CMCF supplies one report at a time. The CMCF generates reports automatically at selected CMCF flight events. The flight events are program selectable and deselectable on the GBST. The CMCF transmits the flight event data to ground stations via datalink.
CMCF Interface Protocol
The CMCF interface protocol supplies the communications with the:
*
DCMF

*
PDF EICAS sub-function

*
FMCF

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CMCS -FUNCTIONAL DESCRIPTION

*
ARINC 629 buses

*
ARINC 429 buses

*
AVLAN.

The CMCF transmits data to and receives data from the DCMF. The data is used for:
*
Downlink and uplink communications

*
AVLAN communications

*
Flight deck printer communications.

The PDF EICAS sub-function supplies FDE status data to the CMCF, which indicates the active, inactive and latched states of the FDEs.
The FMCF transmits data to the CMCF. The CMCF receives:
*
Flight phase

*
Flight number

*
City pair

*
Top of descent.

The CMCF transmits data to and receives data from many LRUs and LRMs. The CMCF supplies three interface protocols for communications with the LRUs and LRMs:
*
ARINC 629 protocol

*
ARINC 429 protocol

*
AVLAN protocol.

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777 AIRCRAFT MAINTENANCE MANUAL

CMCS -FUNCTIONAL DESCRIPTION

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CMCS -FAULT PROCESSING -FUNCTIONAL DESCRIPTION

Fault Processing
The CMCF fault processing sub-function does:
*
Input processing

*
Inhibits and special case BITE

*
Cascaded effect removal

*
Consolidation

*
Maintenance message and FDE correlation

*
Maintenance message and FDE storage.

The fault processing sub-function uses loadable diagnostic information (LDI). The LDI is the set of rules the fault processing sub-function uses to process these faults:
*
Airplane configuration

*
LRU relations

*
Fault report inhibit conditions

*
LRUs that do and do not report faults
　
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