Stabilizer trim ................................. Full APL NOSE DOWN C Trim the airplane to the electrical APL NOSE DOWN limit. Then continue trimming manually to the manual APL NOSE DOWN limit. The full nose down position prevents de-icing fluid and slush run-off from entering the stabilizer balance panel cavity.
WARNING:To avoid personal injury, ensure that the stabilizer
trim wheel handle is stowed prior to using electric
trim.

APU and engine BLEED air switches ............................OFF F/O The bleed air switches must be turned off to reduce the possibility of fumes entering the air conditioning system.
CAUTION: With the APU operating, ingestion of deicing fluid causes objectionable fumes and odors to enter the airplane. This may also cause erratic operation or damage to the APU.
APU ....................................................................... As needed F/O

Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual
Wait approximately one minute after completion of deicing to turn
engine BLEED air switches on to ensure all deicing fluid has been
cleared from the engine:

Engine BLEED air switches .............................................ON F/O Stabilizer trim ......................................................___ UNITS C Verify stabilizer trim is set for takeoff.
Before Takeoff Procedure
Do the following steps after completing the normal Before Takeoff Procedure:
Call “FLAPS ___ “ as needed for takeoff. C Flap lever ....................................Set takeoff flaps, as needed F/O Extend the flaps to the takeoff setting at this time if they have been held because of slush, or standing water or icing conditions or because of exterior de-icing. Verify that the LE FLAPS EXT green light is illuminated. Stabilizer trim ......................................................___ UNITS C
Verify that the stabilizer trim is set for takeoff. If airplane deicing was accomplished: A visual inspection of the airplane wings should be made by the pilots just prior to takeoff.
Takeoff Procedure
Do the normal Takeoff Procedure with the following modification:
Engine run-up .....................................Accomplish as needed PF

If moderate to severe icing conditions are present, the takeoff roll must be preceded by a static run-up to 70% N1 and stable engine operation observed prior to brake release. If the airplane starts to slide on ice or snow during engine power check, release brakes and begin takeoff roll. Continue engine check during early part of the takeoff roll.
Climb and Cruise Procedure
Do the normal Climb and Cruise Procedure with the following additional steps:
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual

ENGINE ANTI-ICE switches ............................... As needed PM Engine anti–ice must be ON during all flight operations when icing conditions exist or are anticipated, except during climb and cruise when the temperature is below –40°C SAT. Engine anti–ice must be
ON prior to, and during descent in all icing conditions, including temperatures below –40°C SAT. When operating in areas of possible icing, activate engine anti–ice
prior to entering icing conditions. Late selection of engine anti–ice may allow inlet ice buildup and ice shedding into the engine.
WARNING:Do not rely on airframe visual icing cues before activating engine anti–ice. Use the temperature and visible moisture criteria.
When engine anti-ice is needed:
ENGINE START switches ............................... CONT PM

ENG ANTI–ICE switches ..................................... ON PM

Verify that the COWL VALVE OPEN lights illuminate bright, then dim.
Verify that the COWL ANTI–ICE lights are extinguished.
Note: If the COWL VALVE OPEN lights remain illuminated bright with engines at IDLE, position the APU BLEED air switch to OFF and increase thrust slightly (up to a maximum of 30% N1.)
CAUTION: Avoid prolonged operation in moderate to severe icing conditions.
Severe icing can usually be avoided by a change in altitude and/or airspeed. If flight in moderate to severe icing conditions cannot be avoided, do the following on both engines, one engine at a time at approximately 15 minute intervals:
Note: At higher altitudes, a descent can be needed:
Thrust ...................................................................Increase PF Increase thrust to a minimum of 80% N1 to ensure the fan blades and spinner are clear of ice.
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual
Engine vibration may occur due to fan blade/spinner icing. If engine vibration continues after increasing thrust, do the following on both engines, one engine at a time:
　
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