If exterior deicing is required:
Flaps .............................................................................................. UP Prevents ice and slush from accumulating in flap cavities.
Thrust levers .................................................................................Idle Reduces the possibility of injury to personnel at inlet or exhaust areas.
Stabilizer trim.............................................. Full APL NOSE DOWN Set stabilizer to the APL NOSE DOWN limit to prevent deicing
fluid and slush run–off from entering the stabilizer balance panel
cavity.
Trim the airplane to the electrical APL NOSE DOWN limit.
Then continue trimming manually to the manual APL NOSE
DOWN limit.
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 Reduces the possibility of fumes entering the air conditioning system.
APU ................................................................................. As required If not required, the APU should be shut down to eliminate the possibility of deicing fluid entering the APU inlet.
CAUTION: With 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.
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
Before Takeoff
Flaps .................................................................................................... Set Extend the flaps to the takeoff setting at this time if they have been held due to slush, or standing water or icing conditions.
Copyright . The Boeing Company. See title page for details.
SP.16.6 June 4, 2004
Supplementary Procedures -Adverse Weather
737 Operations Manual
BEFORE TAKEOFF Checklist ............................................ Accomplish To ensure the airplane is configured for takeoff, accomplish the complete BEFORE TAKEOFF checklist.
If airplane deicing was accomplished:
A visual inspection of the airplane wings should be made just prior to takeoff.
Engine run–up ....................................................Accomplish as required If moderate to severe icing conditions are present, 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 takeoff roll.
Climb and Cruise
Note: After the flaps are up, wing anti–ice should be used to melt any accumulation of slush.
Engine Anti–Ice Operation-Inflight
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 required inflight: ENGINE START switches .......................................................CONT ENG ANTI–ICE switches.............................................................ON
COWL VALVE OPEN lights – illuminated dim
Copyright . The Boeing Company. See title page for details.
June 4, 2004 SP.16.7
Supplementary Procedures -Adverse Weather 737 Operations Manual
COWL ANTI–ICE lights – extinguished
Note: If 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.)
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 accomplish the following, on both engines, one engine at a
time at approximately 15 minute intervals:
Thrust .....................................................................................Increase Increase thrust to a minimum of 80% N1 to ensure the fan blades and spinner are clear of ice.
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