747-400 AMM 飞机维护手册 导航 NAVIGATION 3(157)

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NAV DATA OUT OF DATECLOCK CALENDAR DATE EXCEEDS NAV DATA BASE VALID (ACTIVE) CALENDAR CYCLE
LIMIT ALT FLXXX
FMC ATTEMPTS TO ATTAIN, OR VNAV IS SELECTED AT, AN ALTITUDE GREATER THAN THE VNAV ALTITUDE
NOTE:"VNAV LIMIT ALTITUDE" IS DEFINED AS THE PEAK OF THE MANEUVER ENVELOPE USING EITHER FAA OR CAA MANEUVER CRITERIA, AS APPLICABLE.
SPLIT IRS OPERATION
NUMBER OF IRUs BEING USED FOR NAVIGATION CHANGES FROM 3 TO 2 DUE TO SOFT FAULT OR POLAR NAVIGATION
FMCS Alerting Messages
Figure 36 (Sheet 1)

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MESSAGE / CONDITION _________________ALERTING MESSAGES 
____________END OF ROUTE PASSING LAST ROUTE LEG TERMINATION 
FOLLOWED BY A MANUALLY TERMINATED LEG) _____________DISCONTINUITY PASSING LAST WAYPOINT PRIOR TO A DISCONTINUITY (EXCEPT WHEN THE WAYPOINT IS 
FMC IN IRS ONLY MODE FOR NAVIGATION ____________IRS NAV ONLY 
EITHER NOT TUNED OR A VALID SIGNAL IS NOT BEING RECEIVED ________________________NAV INVALID - TUNE XXXXX R NAV OR VOR APPROACH PROCEDURE REQUIRES A SPECIFIC NAVAID BE TUNED AND IT IS 
NEXT CLIMB RESTRICTION IN CLIMB PROFILE CANNOT BE MET DUE TO UNDERSHOOT _______________UNABLE NEXT ALT 
2 MINUTES BEFORE TOP OF DESCENT POINT WITHOUT LOWERING MCP ALT WINDOW _____________RESET MCP ALT 
_________________INSUFFICIENT FUEL CAUSES THE COMPUTED FUEL BURN TO EXCEED THE TOTAL FUEL IN BOARD A CHANGE IN FLIGHT CONDITIONS OCCURS OR A CHANGE IN THE ROUTE IS MADE WHICH 
DUE TO UNFORECAST CONDITIONS, AIRPLANE OVERSPEEDING _____________DRAG REQUIRED 
NO ACTIVE LATERAL ROUTE AND LNAV SELECTED ON MCP _______________NO ACTIVE ROUTE 
_________________RW/ILS FREQ ERROR WHEN THE AIRPLANE IS WITHIN ILS AUTOTUNING RANGE AND THE TUNED ILS FREQUENCY RECEIVING VALID DATA FROM EITHER ILS DOES NOT MATCH THE FREQUENCY FOR THE ACTIVE ARRIVAL RUNWAY, OR THE FMC IS NOT 
FROM THE SAME ILS THAT THE FMC IS USING FOR ILS FREQUENCY DATA MATCH FOR THE ACTIVE ARRIVAL RUNWAY, OR THE FMC IS NOT RECEIVING VALID COURSE DATA WHEN THE AIRPLANE IS WITHIN ILS AUTOTUNING RANGE AND THE TUNED ILS COURSE DOES NOT ________________RW/ILS CRS ERROR 

FMCS Alerting Messages
Figure 36 (Sheet 2)

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MESSAGE / CONDITION
ALERTING MESSAGES

RESYNCING OTHER FMC
OFFSIDE FMC HAS JUST POWERED UP OR FAILED COMPARISON DATA CHECK AND IS BEING RESYNCHRONIZED TO ONSIDE FMC
RESYNC FAIL - SINGLE FMC FMCS RESYNCHRONIZATION ATTEMPTS ARE UNSUCCESSFUL
SINGLE FMC OPERATIONONSIDE FMC HAS DETERMINED THAT OFFSIDE FMC IS NOT AVAILABLE
CHECK ALT TGT
VNAV IS SELECTED WHEN THE AIRCRAFT IS BETWEEN THE MCP WINDOW ALTITUDE AND FMC TARGET ALTITUDE. VNAV HOLDS LEVEL FLIGHT
THRUST REQUIRED
THE AIRCRAFT IS UNABLE TO MAINTAIN PRECOMPUTED NOMINAL DESCENT PATH WITHOUT INCREASING THRUST AND AUTO THROTTLE IS NOT ENGAGED
END OF OFFSETFIVE NM PRIOR TO PASSING LAST OFFSET LEG TERMINATION
FMC L/R OUTPUT DATA LOSS
SINGLE FMC TRANSMITTER (NON-MCDU, NON-INTERSYSTEM TRANSMITTER) FAILURE DETECTED BY BITE.
ILS TUNE INHIBIT - MCP THE FLIGHT CREW NEEDS TO TAKE ACTION TO RE-TUNE THE ILS
IRS POS/ORIGIN DISAGREE AN IRU POSITION IS GREATER THAN 6 NM FROM THE ACTIVATED ORIGIN AIRPORT
PURGE UPDATES - POS 2
THE FMC HAS REJECTED MULTIPLE NAVAIDS FOR RADIO UPDATING DUE TO A FAILURE OF DME DISTANCE REASONABLENESS CHECKS
FMCS Alerting Messages
Figure 36 (Sheet 3)

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