737 Operations Manual
Performance Inflight -
Text
737-500/CFM56-3_20K
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE PI.36.3
Flap Maneuver Speeds
This table provides the flap speed schedule for recommended maneuvering
speed. The speed schedule is a function of weight and will provide
adequate maneuver margin above stall at all weights.
During flap retraction/extension, movement of the flap to the next position
should be initiated when reaching the maneuver speed for the existing flap.
Slush/Standing Water Takeoff
Experience has shown that aircraft performance may deteriorate
significantly on runways covered with snow, slush, standing water, or ice.
Therefore a reduction in runway/obstacle limited takeoff weight and
revised takeoff speeds is necessary. The following information is intended
for guidance in accordance with advisory material and is based on an
engine failure at the critical point during 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 13mm (0.5 inches) are not
recommended because of possible airplane damage as a result of slush
impingement on the airplane structure. The use of assumed temperature
method for reduced thrust is not allowed on contaminated runways.
Interpolation for slush/standing water depths between the values shown is
permitted.
Instructions for Using Tables:
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 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 amount shown on chart.
4. Enter 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 speeds determination:
December 06, 2002
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