737 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
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D6-27370-866-EGP 11.40.31
Displays default or manually entered cruise CG. Entry of actual cruise CG may
revise maximum altitude capability.
2 PLAN/FUEL
Fuel on board is automatically displayed as received from the airplane fuel
quantity indication system.
PLAN entry allows fuel predictions before actual fuel is known. Entry is blanked
with flaps extended or in flight.
In flight, when the FMC is not receiving the required fuel data, the CDU displays
dashes and allows manual entry of fuel weight. After manual entry, MAN
(manual) appears next to the fuel weight. Manual entry of fuel weight should
continue approximately every 30 minutes for the remainder of the flight to keep
gross weight current.
3 Zero Fuel Weight (ZFW)
Airplane zero fuel weight is required. Normally the ZFW is entered from the
airplane dispatch papers and the FMC calculates the airplane gross weight.
Enter the airplane zero fuel weight.
Valid entry is xxx or xxx.x.
Calculated zero fuel weight is automatically displayed if airplane gross weight is
entered first and fuel on board is valid.
4 RESERVES
Enter fuel reserves for the route.
Entry is required to complete the preflight.
Valid entry is xx or xx.x.
5 COST INDEX
The cost index is used to calculate ECON climb and cruise speeds. The value
reflects the relative impacts on overall trip cost of fuel cost as compared to other
direct hourly operating costs.
Enter the cost index for ECON calculations.
Entry is required to enable use of VNAV mode.
Valid entries are 0 to 500. 0 causes the ECON speed to be MAX RANGE; 500
results in a minimum time flight.
Entry of a company route on RTE page causes any company stored value of cost
index to be automatically displayed. A manual entry has priority.
September 24, 2015
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