Ground Start-up
If the two OFPs do not agree, the primary FMC shows the OP PROGRAM CROSSLOAD page. You use this page to crossload the correct OFP.
If the databases do not agree, a crossload page for that particular database shows on the MCDU.
If an analog discrete/program pin or a performance factor does not agree, the analog discrete or the performance factor page shows. A highlight shows around the item that does not agree.
If you exit BITE before corrective action is taken, the secondary FMC is conditionally failed and the message SINGLE FMC OPERATION shows in the scratchpad on the MCDUs.
In Flight Restarts
For in flight restarts, the two FMCs also compare their information. If the information does not agree, the secondary FMC is conditionally failed and the message SINGLE FMC OPERATION shows in the scratchpad on the MCDUs.
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SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
DIFFERENCE HAS DIFFERENCE HAS HIGHLIGHT
HIGHLIGHT
ANALOG DISCRETES PERFORMANCE FACTORS
DISAGREE AT POWER UP DISAGREE AT POWER UP
NAV DATABASE OPERATION FLIGHT PROGRAM DISAGREE AT POWER UP DISAGREE AT POWER UP
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FMCS BITE PAGES -AUTOMATIC BITE ENTRY
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737-700 MAINTENANCE TRAINING MANUAL
FMCS BITE PAGES - INFLIGHT FAULT THIS PAGE INTENTIONALLY LEFT BLANK
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SOUTHWEST AIRLINES.
FMCS BITE PAGES - INFLIGHT FAULT General
To see in-flight faults, select INFLT FAULT (LSK 1L) on the FMCS BITE page.
The FMC stores in-flight faults for the last nine flight legs and faults that occur on the ground. The FMC can store up to 20 faults for each flight leg.
A new flight leg starts when the groundspeed is more than 20 knots and the airplane goes into the air mode. The flight stops when the airplane touches down and the groundspeed is less than 20 knots.
Faults that occur on the ground are stored as ground faults. These faults clear from the non-volatile memory in the FMC when the groundspeed is more than 20 knots and the airplane becomes airborne. If the fault is still present at this time, it becomes an in-flight fault.
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