737 Operations Manual
Performance Inflight -
Text
737-400/CFM56-3_23.5K
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE PI.26.3
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:
1. Determine takeoff speeds V1, VR and V2 for actual brake release
weight using the Takeoff Speeds table in this section.
2. If V1(MCG) limited, set V1 = V1(MCG). If not limited by V1(MCG)
considerations, enter V1 Adjustment table with actual brake release weight
to determine the V1 reduction to apply to V1 speed. If the adjusted V1 is
less than V1(MCG), set V1 = V1(MCG).
December 07, 2001
To Next Page
Loading...
