Help,help:"unable Crz Alt"advisory Messages Display
BOEING 737-300 AIRCRAFT FLIGHT DECK EFFECT REPORTS "UNABLE CRZ ALT"ADVISORY MESSAGES DISPLAY ON FMC CDU,IT IS HAVE BEEN DESCRIBED "
PERFORMANCE PREDICTS A ZERO CRUISE TIME AT THE ENTERED CRUISE ALTITUDE OR IT WILL
BE UNABLE TO REACH CRUISE ALTITUDE DUE TO PERFORMANCE LIMITATIONS " BY BOEING MAINTENANCE MANUAL .CHECK FMC OPS UPDATE "U5.O",FMC-CDU PERF FACTORS PAGE MIN CRZ TIME ONE MINUTES. FMC OPS UPDATE 5.0 HAVE BEEN Revised the computation of maximum altitude so that it will now be cruise mode dependent. BUT "UNABLE CRZ ALT"ADVISORY MESSAGES SOMETIMES DISPLAY ON CDU. FMC CAN'T COMPLETE ETA Algorithm AND REMIAN FUEL Algorithm.WHY?
MANY THANKS.