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.18.5
Long Range Cruise Control
These tables provide target TPR, 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, .85 Mach
approximates the Long Range Cruise Mach schedule.
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 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 .85/310/250 descent. Tables are
presented for low altitudes for shorter trip distances and high altitudes for
longer trip distances.
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.
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 at .85/310/250
Distance and time for descent are shown for a .85/310/250 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 30 at the outer marker.
February 15, 2010
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