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PDF -primary display function
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PDS -primary display system
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PFC -primary flight computer
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PFD -primary flight display
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PMAT -portable maintenance access terminal
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PSEU -proximity sensor electronics unit
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RAM -random access memory
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SAARU -secondary attitude air data reference unit
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SCSI -small computer system interface
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SD -side display
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SDI -source destination indicator
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SDU -satellite data unit
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SMT -scheduled maintenance task
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TCAS -traffic alert and collision avoidance system
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TMCF -thrust management computing function
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UTC -universal time (coordinated)
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UTCF -universal time (coordinated) function
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WHCU -window heat control unit
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WXR -weather radar
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CENTRAL MAINTENANCE COMPUTING SYSTEM -INTRODUCTION
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CMCS -FAULT PROCESSING CONCEPT
General
The central maintenance computing system (CMCS) does these things:
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Monitors airplane systems for faults
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Processes fault information
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Supplies maintenance messages.
The CMCS also monitors flight deck effect (FDE) activity. The CMCS matches, or correlates, applicable FDEs and maintenance messages.
Flight deck effects (FDEs) tell the flight and ground crews of conditions related to safe operation. The ground crew must find the cause of an FDE to find the corrective action. You use this information along with these manuals to isolate airplane faults
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Fault isolation manual (FIM)
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Airplane maintenance manual (AMM)
Flight Deck Effects
The airplane systems monitor conditions related to loss of a system or function. If a condition exists that requires repair or deferral, the airplane system sends FDE data to the AIMS primary display system (PDS). The PDS shows the FDE.
Many flight log entries have an FDE. The ground crew examines and makes an analysis of additional FDEs before they release the airplane.
Maintenance Messages
Maintenance messages supply the ground crew with detailed fault information to help in troubleshooting. Airplane systems monitor for system faults. If an airplane system finds a fault, it sends maintenance message data to the CMCS. The CMCS processes the data and shows a maintenance message so the maintenance crew can examine it and find a corrective action.
FDE/Maintenance Message Correlation
The CMCS has logic that makes a relation between maintenance messages and FDEs. When an FDE occurs and the CMCS receives a maintenance message that has a relation to the FDE, the CMCS correlates the FDE to the message.
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777 AIRCRAFT MAINTENANCE MANUAL
CMCS -FAULT PROCESSING CONCEPT
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777 AIRCRAFT MAINTENANCE MANUAL
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CMCS -GENERAL DESCRIPTION
General
The central maintenance computing system (CMCS) supports both line maintenance and extended maintenance functions through menu selections on the maintenance access terminal (MAT). Other menu selections support special maintenance functions, supply on-line help, and make reports.
There is a central maintenance computing function (CMCF) in each AIMS cabinet. Only one CMCF operates at a time, the other is a backup.
CMCS Components
The components of the CMCS are the:
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Central maintenance computing function (CMCF) in the AIMS cabinets
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MAT
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MAT keyboard
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Portable maintenance access terminal (PMAT) in the main equipment center (MEC)
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PMAT receptacles (4)
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Ground test switch.
Use the MAT in the flight deck or a PMAT to operate the CMCS.
The PMAT receptacles permit the use of another PMAT. These are the four other locations on the airplane that have PMAT receptacles:
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On the right side of the P40 panel at the nose wheel well
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On the P56 main wheel well electrical service panel
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Inside of the stabilizer jack screw service access door
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On the P18 panel in the flight deck.
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