.
V1 may be reduced to minimum V1 (assuming all weight
limitations are considered) to provide increased stopping distance
performance.
.
Takeoffs on slippery runways are not recommended if the
crosswind exceeds 15 knots or when slush or wet snow is more
than 1/2 inch (13mm) in depth.
.
Improved stall margins can be achieved by the following:
.
If excess runway is available, consider using improved climb procedures for flaps 1 or 5.
.
If runway is limited for the planned takeoff flap setting, consider using the next greater flap position with improved climb performance. This will provide additional stall margins with minimum performance penalties.
Cold Weather Operation
Considerations associated with cold weather operation are primarily concerned with low temperatures and with ice and snow on the airplane, ramps, taxiways and runways.
Icing conditions exist when TAT is 10°C (50°F) or below and:
.
visible moisture (clouds, fog with visibility less than one mile, rain,
snow, sleet, ice crystals, and so on) is present, or
.
standing water, ice, or snow is present on the ramps, taxiways, or
runways.
CAUTION: Do not operate engine or wing anti–ice when the total air temperature (TAT) is above 10°C (50°F).
Supplementary Procedures -Adverse Weather 737 Operations Manual
Preflight
Although removal of surface snow, ice or frost is normally a maintenance function, the flight crew should use additional care and scrutiny during preflight preparation to inspect areas where surface snow or frost could change or affect normal system operations.
Exterior Safety Inspection
Surface............................................................................................Check Takeoff with light coatings of frost, up to 1/8 inch (3mm) in thickness on lower wing surfaces due to cold fuel, is permissible; however, all leading edge devices, all control surfaces, tab surfaces,
upper wing surfaces and balance panel cavities must be free of snow or ice. Thin hoarfrost is acceptable on the upper surface of the fuselage
provided all vents and ports are clear. Thin hoarfrost is a uniform white deposit of fine crystalline texture, which usually occurs on exposed surfaces on a cold and cloudless night, and which is thin enough to distinguish surface features underneath, such as paint lines, markings or lettering.
Control balance cavities .................................................................Check Check drainage after snow removal. Puddled water may refreeze in flight.
Landing gear doors.........................................................................Check Landing gear doors should be free of snow or ice.
Air conditioning inlets and exits ......................................................Clear Verify air inlets and exits, including the outflow valve, are clear of snow or ice. If the APU is operating, check that the outflow valve is full open.
Engine inlets .....................................................................................Clear Check inlet cowling free of ice or snow and verify the fan is free to rotate.
APU air inlets ................................................................................Check The APU inlet door and cooling air inlet must be free of snow or ice prior to APU start.
Copyright . The Boeing Company. See title page for details.
SP.16.2 June 4, 2004
Supplementary Procedures -Adverse Weather
737 Operations Manual
Fuel tank vents ................................................................................. Clear Check all fuel tank vents. All traces of ice or frost should be removed.
Pitot static ports ............................................................................... Clear Check all pitot probes and static ports free of ice and snow. Water rundown after snow removal may refreeze immediately forward of static ports and cause an ice buildup which disturbs airflow over the static ports resulting in erroneous static readings even when static ports themselves are clear.
Flight Deck Preparation
PITOT HEAT......................................................................................ON All probe heat lights – extinguished.
Flight controls ................................................................................ Check This check should be accomplished whenever the airplane has been
exposed to snow, freezing rain or other conditions which could
restrict flight control movement.
Increase in control forces can be expected at low temperatures
because of increased resistance in cables and thickened oil in
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