737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
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6 INDEX
Push – displays the INIT/REF INDEX page.
7 Trip/Cruise Altitude (TRIP/CRZ ALT)
Trip altitude is automatically computed and displayed whenever entries have been
made for the ORIGIN, DEST, GROSS WT, and COST INDEX. Otherwise, the
field is blank.
Trip altitude is the predicted minimum cost altitude determined by operator
constraints. Provides crew a reference for selecting a planned cruise altitude.
Cruise altitude is required.
Enter the cruise altitude for the route.
Automatically displays this cruise altitude on the CLB, CRZ, and RTE Legs
pages.
8 Cruise Wind (CRZ WIND)
Cruise wind entry provides input to optimize FMC calculations.
Enter the forecast cruise wind.
Entry is propagated onto the RTE DATA page.
If no entry made, the FMC assumes zero wind for preflight predictions.
9 Top of Climb Outside Air Temperature (T/C OAT)
T/C OAT entry provides input to optimize FMC calculations.
Entry causes ISA DEV to be computed and displayed.
Enter top of climb OAT.
If no entry made, FMC assumes ISA value.
Note: FMC Update U10.7 and later takes advantage of sensed static air
temperature (SAT) to automatically provide updating of the MAX altitude.
The revised temperature model applies after climbing 5000 feet above the
departure runway elevation. Calculation of MAX altitude uses the actual
ISA deviation derived from the actual sensed SAT projected up to the
MAX and OPT altitude solutions. The temperature model prior to U10.7 is
still applied below 5000 feet. T/C OAT, if entered on the PERF INIT page,
is used for the preflight planning forecast of MAX/OPT altitude.
10 Transition Altitude (TRANS ALT)
Displays 18,000 feet at FMC power up.
September 24, 2015
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