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.17.11
It is desirable to maintain engine thrust level within the limits of the Max
Cruise thrust rating. However, where thrust level in excess of Max Cruise
rating is required, such as for meeting terrain clearance, ATC altitude
assignments, or to attain maximum range capability, it is permissible to use
the thrust needed up to the Max Continuous thrust rating. The Max
Continuous thrust rating is intended primarily for emergency use at the
discretion of the pilot and is the maximum thrust that may be used
continuously.
Driftdown Speed/Level Off Altitude
The table shows optimum driftdown speed as a function of cruise weight
at start of driftdown. Also shown are the approximate weight and pressure
altitude at which the airplane will level off considering 100 ft/min residual
rate of climb.
The level off altitude is dependent on air temperature (ISA deviation).
Driftdown/LRC Range Capability
This table shows the range capability from the start of driftdown.
Driftdown is continued to level off altitude. As weight decreases due to
fuel burn, the airplane is accelerated to Long Range Cruise speed. Cruise
is continued at level off altitude and Long Range Cruise speed.
To determine fuel required, enter the Ground to Air Miles Conversion table
with the desired ground distance and adjust for anticipated winds to obtain
air distance to destination. Then enter the Driftdown/Cruise Fuel and Time
table with air distance and weight at start of driftdown to determine fuel
and time required. If altitudes other than the level off altitude is used, fuel
and time required may be obtained by using the Engine Inoperative Long
Range Cruise Enroute Fuel and Time table.
Long Range Cruise Altitude Capability
The table shows the maximum altitude that can be maintained at a given
weight and air temperature (ISA deviation), based on Long Range Cruise
speed, Max Continuous thrust, and 100 ft/min residual rate of climb.
Long Range Cruise Control
The table provides target %N1, engine inoperative Long Range Cruise
Mach number, IAS and fuel flow for the airplane weight and pressure
altitude. The fuel flow values in this table reflect single engine fuel burn.
September 15, 2016
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