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In-Flight Faults Page
The in-flight faults page shows this data:
-Name of the LRU/sub-system
-Where the fault occurred (in flight or on the ground)
-Fault was recorded by one or both FMCs
-Flight leg when the fault occurred.
All of the LRU/sub-systems that interface with the FMCS show on the IN FLTS FAULTS pages. These LRU/sub-systems show on pages 1, 2, and 3:
-Air data inertial reference system (ADIRS)
-Digital flight control system (DFCS)
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737-700 MAINTENANCE TRAINING MANUAL
-Distance measuring equipment (DME)
-Fuel quantity indicating system (FQIS)
-Common display system (CDS)
-VHF omni-directional range (VOR)
-Multi-mode receiver (MMR)
-Clock
-Airborne communication and reporting system (ACARS)
-Multifunction control display unit (MCDU).
-Flight management computer (FMC)
The LRU/sub-systems with a failure show the number from 1 through 9. This number is the flight leg when the fault occurred.
The LRU/sub-systems with a failure show one of these letters:
-L (FMC 1)
-R (FMC 2)
-B (FMC 1 and FMC 2).
This shows the FMC that recorded the fault. The alpha-numeric characters at the top of the page show which flight leg the fault occurred in or if it occurred on the ground.
Flight number 1 is the last flight and flight number 9 is 9 flights ago. The letter G shows that the fault was recorded on the ground after the last flight.
NOTE: Ground faults are FMC and MCDU faults only.
If no faults were recorded by the FMCS for that LRU, the display to the right of the LRU is blank.
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FMCS BITE PAGES - INFLIGHT FAULT
Line select key 6L shows the INDEX prompt. This selects the FMCS BITE INDEX page.
To see more details about the possible LRU failures, you can set the engineering code 300 into the scratch pad and push LSK 6R. This shows the flight select page.
Flight Select Page
This page shows a menu of the flight legs that have faults recorded. If no faults were recorded by the FMCS for a particular flight leg, the flight leg does not show on the MCDU.
The engineering data can be selected for a particular flight leg or ground fault from this page and show on the FLIGHT page.
Line select key 6L shows the INDEX prompt. This selects the IN FLT FAULTS page.
Flight Page
This page shows the engineering data for the selected flight leg. The faults show in chronological order
This engineering data shows for each fault:
-System code
-Label code
-Fault state
-Failure time
-Monitor code.

The system code shows the failed LRU or sub-system.
For an FMCS fault, the label code shows the failed circuitry or a program fault in the FMC. For a sensor input fault, the label code identifies the ARINC word with the fault.
　
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