*
Occurrences of faults related to an ATA chapter

*
Faults from the fault database.

The CMCF can supply a download of the fault history database to the MAT disk drive module. The CMCF can also accept an upload of a fault history database from the MAT disk drive module.

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CMCS -FAULT PROCESSING -FUNCTIONAL DESCRIPTION

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CMCS -AIRLINE MODIFIABLE INFORMATION

General

The design of the 777 airplane lets the airlines customize certain functions in the central maintenance computing system (CMCS). You customize these functions through airline modifiable information (AMI). You use the ground based software tool (GBST) to make the modifications.
The CMCS system comes with a baseline AMI. The baseline AMI for this system has HELP pages only.
The total memory available for the CMCS AMI is one megabyte. This total includes the baseline AMI and any modifications you make using the GBST.
You use the GBST to modify these:
*
Help

*
Reports selections

*
Tail number cross reference table.

Baseline Help

The baseline AMI provides help screens for displays and dialog boxes.
Modifiable Functions

You can modify the baseline AMI and show help for most displays and most dialog boxes.
You can use the GBST to specify a selection for an automatic downlink of CMCF reports. You can specify these:
*
Type of report to downlink

*
Trigger for the report

*
Destination (VHF or SATCOM)

*
Downlink label and sublabel.

You can have a table to define the airplane tail identification. This table correlates to the ICAO addresses with tail numbers to allow proper identification for downlinked messages. This table has all the tail numbers for the airplanes in your 777 fleet.
Training Information Point
The CMCS AMI supplies the airplane tail identification to the data communication management system (DCMS). The DCMS aircraft communication addressing and reporting system (ACARS) sub-function must have this information to operate.

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777 AIRCRAFT MAINTENANCE MANUAL

CMCS -AIRLINE MODIFIABLE INFORMATION

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CMCS -FLIGHT LEG LOGIC

General

You can review fault data on the MAT by flight legs. The CMCF computes the flight legs.
The flight leg logic defines the flight leg period. There are no time gaps between flight legs. When one flight leg ends, the next flight leg begins.
Flight Leg Transition Logic

The CMCF transitions or increments the flight leg when all of these conditions are true:
*
The airplane is on the ground

*
Either one of the engines is running after both have been shut down or one or both engines are running and the last door transitions from open to closed

*
The flight leg transition is enabled.

Flight Leg Enable Logic

The flight leg enable logic prevents nuisance flight legs because of engine starts and shutdowns or doors open and closed.
A flight leg enable occurs when either of these are true:

*
You manually enable the flight leg on the MAT

*
The CMCF detects parking brakes off, engine at takeoff thrust, and a ground speed of more than 80 knots.

After the enable occurs, The CMCF stores it until the next flight leg transition logic becomes true.
When the CMCF uses the enable, a new flight leg enable must occur before the next flight leg can transition.
When the flight leg transition occurs, the CMCF generates a transition inhibit. This inhibit resets the enable logic. You can also manually set the transition inhibit on the MAT.
The next flight leg enable causes the inhibit to go away.
Flight Leg Calculations
The current flight leg shows as flight leg 00.
The previous flight leg shows as flight leg 01.
Other flight legs show as 02, 03, 04,...99. The CMCF stores the most recent 100 flight legs.
Flight legs help identify faults stored for these:
*
Inbound flight deck effects

*
Present leg faults

*
Fault history.

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