Note: Do not operate engine or wing anti–ice when in-flight total air temperature (TAT) is above 10°C (50°F.)
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual

Exterior Inspection - Captain or First Officer
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.
Do the normal Exterior Inspection with the following additional steps:
Surfaces ..........................................................................................Check Check for frost, 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 that the air inlets and exits, including the outflow valve, are
clear of snow or ice.
If the APU is operating, verify that the outflow valve is fully open.

Engine inlets .....................................................................................Clear Verify that the inlet cowling is free of ice or snow. Verify that 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.
Fuel tank vents .................................................................................Clear Check all fuel tank vents. All traces of ice or frost should be removed.
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Adverse Weather
737 Flight Crew Operations Manual
Pitot probes and static ports ............................................................. Clear

Verify that 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.
Preflight Procedure - First Officer
Do the following step after completing the normal Preflight Procedure
- First Officer:
PROBE HEAT...............................................................................ON All probe heat lights – extinguished.
Engine Start Procedure
Do a normal engine start with the following modifications:
.  
If the engine has been cold soaked for one or more hours at
ambient temperatures less than -40°C, do not start or motor the
engine. Maintenance personnel should accomplish appropriate
procedures for adverse weather heating of the Hydro-Mechanical
Unit.

.  
If the engine has been cold soaked for three or more hours at
ambient temperatures less than -40°C, do not start or motor the
engine. Maintenance personnel should accomplish appropriate
procedures for adverse weather starter servicing.

.  
If ambient temperature is below -35°C (-31°F), idle the engine for
two minutes before changing thrust lever position.

.  
Up to three and one–half minutes may be allowed for oil pressure
to reach the minimum operating pressure. During this period, the
LOW OIL PRESSURE light may remain illuminated, pressure
may go above the normal range and the FILTER BYPASS light
may illuminate. Operate the engine at idle thrust until oil pressure
returns to the normal range.

Before Taxi Procedure
Do the normal Before Taxi Procedure with the following modifications:
GENERATOR 1 and 2 switches .......................................ON F/O Normally the engine IDG’s will stabilize within one minute, although due to cold oil, up to five minutes may be needed to produce steady power.
Copyright . The Boeing Company. See title page for details.
September 29, 2005   SP.16.3
Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual
　
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