787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Performance Inflight
Tex t
787-8/
FAA
Category A Brakes
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC PI.18.9
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/Cruise 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 correct 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 Diversion Fuel and Time table.
Long Range Cruise Altitude Capability
Table show the maximum altitude that can be maintained at a given weight
and air temperature (ISA deviation), based on LRC speed, Max Continuous
thrust, and 100 ft/min residual rate of climb.
Long Range Cruise Control
The table provides target TPR, 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.
February 15, 2010
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