737 Flight Crew Operations Manual
Performance Inflight
Text
737-800WSFP1/CFM56-7B26
FAA
Category C/N Brakes
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP PI.17.7
All Engines
Long Range Cruise Maximum Operating Altitude
These tables provide the maximum operating altitude in the same manner
as the FMC. Maximum altitudes are shown for a given cruise weight and
maneuver capability. This table considers both thrust and buffet limits,
providing the more limiting of the two. Any data that is thrust limited is
denoted by an asterisk and represents only a thrust limited condition in
level flight with 100 ft/min residual rate of climb. Flying above these
altitudes with sustained banks in excess of approximately 15° may cause
the airplane to lose speed and/or altitude. The altitudes shown in the table
are limited to the maximum certified altitude of 41000 ft.
Long Range Cruise Control
These tables provide target %N1, Long Range Cruise Mach number, IAS
and standard day fuel flow per engine for the airplane weight and pressure
altitude. As indicated by the shaded area, at optimum altitude .79M
approximates the Long Range Cruise Mach schedule.
Long Range Cruise Enroute Fuel and Time
Long Range Cruise Enroute Fuel and Time tables are provided to
determine remaining time and fuel required to destination. The data is
based on Long Range Cruise and .78/280/250 descent. Tables are
presented for low altitudes and high altitudes.
To determine remaining fuel and time required, first enter the Ground to
Air Miles Conversion table to convert ground distance and enroute wind to
an equivalent still air distance for use with the Reference Fuel and Time
tables. Next, enter the Reference Fuel and Time table with air distance
from the Ground to Air Miles Conversion table and the desired altitude 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.
APU Operation During Flight
For APU operation during flight, increase fuel flow according to the table
in the Engine Inoperative text section.
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.
September 15, 2016
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