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Performance Inflight Chapter PI
Text Section 13
Copyright © The Boeing Company. See title page for details.
D632W001-TBC PI.13.1
TPext I.13 Performance Inflight-Text
Introduction
This chapter contains information to supplement performance data from the Flight
Management Computer. In addition, sufficient inflight data is provided to
complete a flight with the FMC inoperative. In the event of conflict between data
presented in this chapter and that contained in the Approved Flight Manual, the
Flight Manual shall always take precedence.
Flight with Unreliable Airspeed / Turbulent Air Penetration
Body attitude and average %N1 information is provided for use in all phases of
flight in the event of unreliable airspeed/Mach indications resulting from blocking
or freezing of the pitot system. Loss of radome may also cause unreliable
airspeed/Mach indications. Climb, cruise and descent information is based on the
recommended turbulent air penetration speed schedule: 270 knots below 25,000
feet, 280 knots or 0.82 Mach whichever is lower at 25,000 feet and above;
maintain a minimum speed of 15 knots above the minimum maneuvering speed
when below 0.82 Mach. This schedule provides ample protection from stall and
high speed buffet, while also providing protection from exceeding structural
limits.
Pitch attitude is shown in bold type for emphasis since altitude and/or vertical
speed may also be unreliable.
Max Climb %N1
This table shows Max Climb %N1 for a 310/.84 climb speed schedule, normal
engine bleed for packs on and anti-ice off. Enter the table with airport pressure
altitude and TAT and read %N1. %N1 adjustments are shown for anti-ice
operation.
VREF Speeds
This table contains flaps 30, 25 and 20 reference speeds for a given weight.
Advisory Information
Normal Configuration Landing Distance
Tables are provided as advisory information for normal configuration landing
distances on dry runways and slippery runways with good, medium, and poor
reported braking action. Landing distances for slippery runways are 115% of the
actual landing distances.
December 10, 2007
777 Flight Crew Operations Manual
Performance Inflight -
Text
Copyright © The Boeing Company. See title page for details.
PI.13.2 D632W001-TBC
To use these tables, determine the reference landing distance for the selected
braking configuration. Then adjust the reference distance for landing weight,
altitude, wind, slope, temperature, approach speed, and the number of operative
thrust reversers to obtain the actual landing distance.
When landing on slippery runways or runways contaminated with ice, snow,
slush, or standing water, the reported braking action must be considered. If the
surface is affected by water, snow, or ice, and the braking action is reported as
"good", conditions should not be expected to be as good as on clean, dry runways.
The value "good" is comparative and is intended to mean that airplanes should not
experience braking or directional control difficulties when landing. The
performance level used to calculate the "good" data is consistent with wet runway
testing done on early Boeing jets. The performance level used to calculate "poor"
data reflects runways covered with wet ice.
Use of the autobrake system commands the airplane to a constant deceleration
rate. In some conditions, such as a runway with "poor" braking action, the
airplane may not be able to achieve these deceleration rates. In these cases,
runway slope and inoperative reversers influence the stopping distance. Since it
cannot be determined quickly when this becomes a factor, it is appropriate to add
the effects of slope and inoperative reversers when using the autobrake system.
Non-Normal Configuration Landing Distance
Advisory information is provided to support non-normal configurations that affect
landing performance of the airplane. Landing distances and adjustments are
provided for dry runways and runways with good, medium, and poor reported
braking action.
Enter the table with the applicable non-normal configuration and read the normal
approach speed. The reference landing distance is a reference distance from 50 ft
above the threshold to stop based on a reference landing weight and speed at sea
level, zero wind, and zero slope. Subsequent columns provide corrections for
off-reference landing weight, altitude, wind, slope, and speed conditions. Each
corrections is independently added to the reference landing distance. Landing
distance includes the effects of max manual braking and reverse thrust.
For an engine inoperative landing, check the rate of climb capability shown in
　
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