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LRUs that the CMCF has access to for shop faults information
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Options
*
LRU/LRM installation data.
Flight Leg and Flight Phase Calculations
The CMCF calculates the airplane flight legs. The flight legs are calculated as:
*
Present leg = leg 0
*
Last leg = leg -1
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Previous legs = legs -2, -3, -4, etc. to -99.
The CMCF calculates the airplane flight phases, which are:
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Power on
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Engine start
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Taxi out
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Takeoff roll
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Initial climb
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Climb
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Cruise
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Descent
*
Approach
*
Go around
*
Flare
*
Rollout
*
Taxi in
*
Shutdown
*
Maintenance.
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Ground Tests
The CMCF controls ground tests for the airplane systems. These are the three types of ground tests:
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System test
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Operational test
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LRU replacement test.
System tests make sure the system meets all tolerances and specifications for in-service use.
Operational tests are short tests that find if the system is operational.
LRU replacement tests make sure that you installed an LRU correctly and it does a check of airplane system interfaces.
Some of the grounds tests are interactive tests. Interactive tests require interaction on the MAT to complete the test.
The CMCF transmits test commands and receives test replies from the airplane systems on the:
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ARINC 629 buses
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ARINC 429 buses
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Onboard local area network (OLAN).
System Configuration
The CMCF supplies equipment and software identification (ID) data from many LRUs and LRMs to show on the MAT. The CMCF transmits ID data to and receives system configuration data from LRUs and LRMs connected to the:
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ARINC 629 buses
*
ARINC 429 buses
*
OLAN.
Input Monitoring
The CMCF has an input monitoring sub-function which receives input signals and supplies the signals for display on the MAT. The CMCF monitors these five signal input types:
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ARINC 629
*
ARINC 429
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Analog variable
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Analog discrete
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AIMS intermodule memory (IMM).
Onboard Engine Balancing
The CMCF, with the left and right airborne vibration monitoring units, supplies the onboard engine balancing system (OEBS). The airbone vibration monitoring units transmit data to the CMCF for the OEBS.
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The CMCF starts and controls the engine balancing procedure. The CMCF also supplies the displays for the engine balancing procedure.
Special Functions
The CMCF supplies special functions for certain LRUs and LRMs. The protocols for special functions is the same as the protocols for ground tests. The CMCF transmits data to and receives data from the LRUs and the LRMs to show special function displays on the MAT.
Data Load Gateway
The data load gateway sub-function supplies the transfer of data between a data loader and an LRU or LRM. The data load gateway sub-function permits only one software data loading or recording session at a time.
The data load gateway sub-function moves the data between a source and a destination. The sources and destinations are LRUs and LRMs.
The sources of data for data loading are the:
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MAT
*
PMAT.
The data load gateway sub-function can update a destination software configuration or record data from an LRU.
The data load gateway sub-function permits data transfers when weight is on the wheels for 5 minutes and computed airspeed is less than 40 knots.
The data load gateway sub-function supplies data to show that a destination LRU is being loaded by the data load gateway sub-function. This permits the fault processing sub-function not to show that the destination LRU has failed due to lack of response or incorrect output due to the load process. The data load gateway sub-function sends control and status data, and receives control and status data from the:
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ARINC 629 buses
*
ARINC 429 buses
*
Avionics local area network (AVLAN).
Software Controlled Options
The CMCF identifies software controlled options by the:
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Operational program configuration (OPC) file
*
Airline modifiable information (AMI)
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