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Aircraft tail identification
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Operational status of the ADSF
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Uncorrected barometric altitude
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Mach number
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Total air temperature (TAT)
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Vertical rate.
The ADS reports occur without any flight crew action.
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FMCS -FMCF FUNCTIONAL DESCRIPTION -BITE/FAULT MONITORING SUB-FUNCTION
General
The FMCF BITE and fault monitoring sub-function does software and hardware comparisons, input monitoring, and fault recording. The BITE and fault monitoring sub-function uses both external and internal inputs to do:
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Input monitoring
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Power-up checks
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Cross cabinets checks
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Synchronization monitoring
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Software reset.
The BITE and fault monitoring sub-function sends fault display data to the display control sub-function. It also sends fault data to the central maintenance computing function (CMCF) for fault recording.
Input Monitoring
The FMCFs monitor inputs from the CDUs and all the applicable line replaceable units (LRUs). The FMCFs monitor the input buses to find if the input signals are active, not active, valid or invalid.
Power-Up Checks
The FMCF does compatibility and comparison checks during power-up and internal monitoring during normal operation. Power-up checks are done at power-up and at BITE restarts. These are the checks and comparisons that occur:
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Operational program configuration (OPC) check. The FMCF compares the OPC and the FMCF operational software. If they do not agree, the FMCF fails and a maintenance message occurs on the MAT.
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Performance database (PDB) check. The FMCF monitors the airframe/engine identification program pin input and OPS. If they do not agree, the FMCF fails and a maintenance message occurs on the MAT.
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PDB/electronic engine controller (EEC) comparison. The FMCF compares the engine type and thrust rating in the PDB and the engine type and thrust rating from the EEC. If they do not agree, the FMCF stores the EEC data in non-volatile memory then restarts.
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Airline modifiable information (AMI) comparison. The FMCF compares the AMI file with the OPS and the OPC. If they do not agree, the FMCF uses the AMI default values.
Cross Cabinet Checks
The active FMCF compares its OPS, PDB, and navigation data base (NDB) to the inactive FMCF to make sure they agree. If they do not agree, the inactive FMCF fails. A maintenance message goes to the CMCF for display and storage.
Sychronization Monitoring
FMCF synchronization monitoring occurs at power-up and during normal operation. The active FMCF sends flight plan data to the inactive FMCF. This occurs so the inactive FMCF can take over if the active FMCF fails. The active FMCF sends its flight plan data to the inactive FMCF for these conditions:
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Long term power-ups
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BITE induced restart
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Flight plan entries and performance data changes.
When the active FMCF fails, a resychronization (resync) occurs. Resyncs take about 1 second for an entire flight plan update. The active FMCF always resyncs the inactive FMCF. The active FMCF selection is a function of the FMC selector position and FMF partition health.
Software Reset
An AIMS software reset from the MAT does a test of the FMCFs and clears memory buffers, flight plans, and user entered data. Fault data stays in memory over the reset.
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FMCS -AIRLINE MODIFIABLE INFORMATION
General
The 777 airplane lets the airlines customize certain default values in the flight management computing system. You customize these functions through airline modifiable information (AMI). You use the ground based software tool (GBST) to make the modifications.
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