787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Performance Inflight
Text
787-8/
FAA
Category A Brakes
Copyright © The Boeing Company. See title page for details.
PI.18.2 D615Z003-TBC
VREF Speeds
This table contains flaps 30, 25 and 20 reference speeds for a given weight.
Flap Maneuver Speeds
This table provides the flap speed schedule for recommended maneuver
speeds. During flap retraction/extension, selecting the next flap setting
should be initiated when reaching the maneuver speed for the existing flap
position.
Slush/Standing Water
Experience has shown that aircraft performance may deteriorate
significantly on runways covered with snow, slush, standing water or ice.
Therefore, reductions in runway/obstacle limited takeoff weight and
revised takeoff speeds are necessary. The tables are intended for guidance
in accordance with advisory material and assume an engine failure at the
critical point during the takeoff.
The entire runway is assumed to be completely covered by a contaminant
of uniform thickness and density. Therefore this information is
conservative when operating under typical colder weather conditions
where patches of slush exist and some degree of sanding is common.
Takeoffs in slush depths greater than 0.5 inches (13 mm) are not
recommended because of possible airplane damage as a result of slush
impingement on the airplane structure. The use of assumed temperature
for reduced thrust is not allowed on contaminated runways. Interpolation
for slush/standing water depths between the values shown is permitted.
Takeoff weight is determined as follows:
(1) Determine the dry field/obstacle limit weight for the takeoff flap
setting.
(2) Enter the Weight Adjustment table with the dry field/obstacle limit
weight to obtain the weight reduction for the slush/standing water depth
and airport pressure altitude.
(3) Adjust field length available for temperature by the amount provided
in the notes below the V1(MCG) limit weight table.
(4) Enter the V1(MCG) Limit Weight table with the adjusted field length
and pressure altitude to obtain the slush/standing water limit weight with
respect to minimum field length required for V1(MCG) speed.
The maximum allowable takeoff weight in slush/standing water is the
lesser of the limit weights found in steps 2 and 4.
Takeoff speed determination:
February 15, 2010
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