737 Operations Manual
Performance Inflight -
Text
737-500/CFM56-3_20K
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE PI.36.7
and read Reference Fuel and Time Required. Lastly, enter the Fuel
Required Adjustment Table with the Reference Fuel and the actual weight
at checkpoint to obtain fuel required to destination.
Long Range Cruise Wind-Altitude Trade
Wind is a factor which may justify operations considerably below optimum
altitude. For example, a favorable wind component may have an effect on
ground speed which more than compensates for the loss in air range.
Using this table, it is possible to determine the break-even wind (advantage
necessary or disadvantage that can be tolerated) to maintain the same range
at another altitude and long range cruise speed. The tables make no
allowance for climb or descent time, fuel or distance, and are based on
comparing ground fuel mileage.
Descent
Distance and time for descent are shown for a .74M/250 KIAS descent
speed schedule. Enter the table with top of descent pressure altitude and
read distance in nautical miles and time in minutes. Data is based on flight
idle thrust descent in zero wind. Allowances are included for a straight-in
approach with gear down and landing flaps at the outer marker.
Holding
Target %N1, indicated airspeed and fuel flow per engine information is
tabulated for holding with flaps up based on the FMC optimum holding
speed schedule. This is the higher of the maximum endurance speed and
the maneuvering speed. Small variations in airspeed will not appreciably
affect the overall endurance time. Enter the table with weight and pressure
altitude to read %N1, IAS and fuel flow per engine.
Advisory Information
Autobrake Landing Distance
The Autobrake Landing Distance Table is provided as advisory
information to assist in the selection of the most desirable auto brake
setting for a given field length. It is not to be used to determine required
field length. This data reflects actual landing distances on a dry runway for
setting 1 through MAX, from touchdown to full stop, with or without
reverse thrust. The table includes typical flare distances from threshold.
To use the Autobrake Landing Distance Table, first determine the
available (or desired) landing distance. Enter the chart with the estimated
approach speed and determine the actual stopping distance from
December 06, 2002
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