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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 EPR, 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.
December 10, 2007
777 Flight Crew Operations Manual
Performance Inflight -
Text
Copyright © The Boeing Company. See title page for details.
D632W001-TBC PI.23.5
Long Range Cruise Diversion Fuel and Time
Tables are provided for crews to determine the fuel and time required to proceed
to an alternate airfield with one engine inoperative. The data is based on single
engine Long Range Cruise speed and .84/310/250 descent. Enter with Air
Distance as determined from the Ground to Air Miles Conversion Table and read
Fuel and Time required at the cruise pressure altitude. Adjust the fuel obtained for
deviation from the reference weight at checkpoint as required by entering the off
reference fuel corrections table with the fuel required for the reference weight and
the actual weight at checkpoint. Read fuel and time required for the actual weight.
Holding
Single engine holding data is provided in the same format as the all engine holding
data and is based on the same assumptions.
December 10, 2007
777 Flight Crew Operations Manual
Performance Inflight -
Text
Copyright © The Boeing Company. See title page for details.
PI.23.6 D632W001-TBC
Intentionally
Blank
December 10, 2007
777 Flight Crew Operations Manual
Performance Inflight - QRH Chapter PI
Table of Contents Section 30
Copyright © The Boeing Company. See title page for details.
D632W001-TBC PI.TOC.30.1
777-300 PW4090 LB FAA 777-300 PW4090 LB FAA
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.30.1
Flight With Unreliable Airspeed /
Turbulent Air Penetration . . . . . . . . . . . . . . . . . . . . . . . . . . PI.30.1
Max Climb EPR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.30.4
VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.30.5
Advisory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.31.1
Normal Configuration Landing Distance . . . . . . . . . . . . . . . PI.31.1
Non-Normal Configuration Landing Distance . . . . . . . . . . . PI.31.4
Recommended Brake Cooling Schedule . . . . . . . . . . . . . . . PI.31.8
Landing Climb Limit Weight . . . . . . . . . . . . . . . . . . . . . . . PI.31.10
Engine Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.32.1
Initial Max Continuous EPR . . . . . . . . . . . . . . . . . . . . . . . . . PI.32.1
Max Continuous EPR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.32.2
Driftdown Speed/Level Off Altitude . . . . . . . . . . . . . . . . . . PI.32.6
Driftdown/LRC Cruise Range Capability . . . . . . . . . . . . . . PI.32.7
Long Range Cruise Altitude Capability . . . . . . . . . . . . . . . . PI.32.8
Long Range Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . PI.32.9
Long Range Cruise Diversion Fuel and Time . . . . . . . . . . PI.32.10
Holding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.32.12
Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.33.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.33.1
Advisory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PI.33.1
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波音777快速检查单 Quick Reference Handbook QRH(103)
