Flight controls ..............................................................Check An increase in control forces can be expected at low temperatures
because of increased resistance in cables and thickened oil in
snubbers and bearings.
If any flight control is suspected of binding or restricted movement,

maintenance personnel should do the appropriate portion of SP.9,

Flight Controls Check Supplementary Procedure.
CAUTION: The flap position indicator and leading edge devices annunciator panel should be closely observed for positive movement. If the flaps should stop, the flap lever should be placed immediately in the same position as indicated.
ENGINE ANTI–ICE switches .............................. As needed F/O Engine anti-ice must be ON during all ground operations when icing conditions exist or are anticipated.
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 F/O

ENGINE ANTI-ICE switches ............................... ON F/O

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 APU BLEED air switch to OFF and increase thrust slightly (up to a maximum of 30% N1.)
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual
WING ANTI–ICE switch......................................As needed F/O Use wing anti-ice during all ground operations between engine start and takeoff when icing conditions exist or are anticipated, unless the airplane is protected by the application of Type II or Type IV fluid in compliance with an approved ground de–icing program.
WARNING:Do not use wing anti-ice as an alternative for ground de-icing/anti-icing. Close inspection is still needed to ensure that no frost, snow or ice is adhering to the wing, leading edge devices, stabilizer, control surfaces or other critical airplane components at takeoff.
When wing anti-ice is needed:
WING ANTI-ICE switch .......................................ON F/O

Verify that the R and L VALVE OPEN lights illuminate bright,
then dim.
Note: The wing anti–ice VALVE OPEN lights may cycle bright/dim due to the control valves cycling closed/open in response to thrust setting and duct temperature logic.
Flaps ............................................................................ Check F/O

Move flaps from Flaps up to Flaps 40 back to Flaps up (i.e., full
travel) to ensure freedom of movement.
CAUTION: The flap position indicator and leading edge devices annunciator panel should be closely observed for positive movement. If the flaps should stop, the flap lever should be placed immediately in the same position as indicated.
Call “FLAPS ___” as needed.
Flaps ......................................................................As needed F/O If taxi route is through slush or standing water in low temperatures or if precipitation is falling with temperatures below freezing, taxi with flaps up. Taxiing with flaps extended subjects the flaps and flap drives to snow and slush accumulations from the main gear wheels. Leading edge devices are also susceptible to slush accumulations.
Taxi–Out
Do the following steps during the taxi-out:
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual

Nose wheel steering .....................................................Check C Nose wheel steering should be exercised in both directions during taxi to circulate warm hydraulic fluid through steering cylinders and minimize steering lag caused by low temperatures.
Engine run up ................................................... Do as needed C

Run-up to as high a thrust setting as practical (70% N1 recommended) at 30 minute intervals for approximately 30 seconds duration.
If airport surface conditions and the concentration of aircraft do not permit the engine thrust level to be increased to 70%, then set a thrust level and time at that thrust level as high as practical.
Note: When operating in conditions of freezing rain, freezing drizzle, freezing fog or heavy snow, additional momentary run-ups to 70% N1 at intervals of 10 minutes or less should be considered.
Exterior De-icing
Flaps ..................................................................................UP F/O Flaps should be positioned up to prevent ice and slush from accumulating in flap cavities during de-icing.
Thrust levers .....................................................................Idle C
　
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