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Engine run–up (As required) ........................................... Accomplish
If icing conditions are present, nacelle anti-ice must be selected
immediately after engine start. During prolonged ground operation,
periodic engine run-up to as high a thrust setting as practical
(60% N1 recommended) should be performed to reduce the possiblity
of ice build-up. Run-ups of 30 seconds duration should be
accomplished at 30 minute intervals.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
SP.16.4 D6-30151-425
Supplementary Procedures -
Adverse Weather
When nacelle anti-ice is no longer required on the ground:
Nacelle Anti-ice switches ........................................................ AUTO
Taxi–Out
CAUTION: Use extreme caution when taxiing on ice-covered
taxiways or runways, as excessive speed or high
crosswinds may start a skid. Make all turns at a
reduced speed. Use smaller tiller and rudder inputs,
apply minimum thrust evenly and smoothly.
Nose wheel steering .......................................................................Check
Exercise nose wheel steering in both directions during taxi to circulate
warm hydraulic fluid through steering cylinders and minimize steering lag
caused by low temperatures.
Flaps (As required) ............................................................................ SET
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 flaps and flap drives to snow and
slush accumulations from the main gear wheels. Leading edge devices are
also susceptible to slush accumulations.
If exterior deicing required:
Flaps ..............................................................................................UP
Prevents ice and slush from accumulating in flap cavities.
Thrust levers........................................................................... CLOSE
Reduces possibility of injury to personnel at inlet or exhaust areas.
Nacelle Anti-ice switches ............................................................. ON
Pack control selectors ..................................................................OFF
Reduces possibility of fumes entering the air conditioning system.
If APU operations not required:
APU selector ..........................................................................OFF
APU should be shut down when deicing surfaces around the inlet to
eliminate the possibility of deicing fluid entering the APU.
October 1, 2000
747 Operations Manual
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
D6-30151-425 SP.16.5
If APU operations required:
APU bleed valve switch ......................................................... OFF
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
Pack selectors on to ensure all deicing fluid has been cleared from the
engines:
APU bleed valve switch ................................................................ON
Pack control selectors ....................................................................ON
APU selector (As required) .................... START, RELEASE TO ON
Before Takeoff
Flaps ....................................................................................................Set
Extend flaps to takeoff setting at this time if they have been held due to
slush, standing water, or icing conditions.
BEFORE TAKEOFF Checklist ............................................ Accomplish
Accomplish the complete BEFORETAKEOFF checklist to ensure the
airplane is configured for takeoff.
If airplane deicing was accomplished:
A visual inspection of the airplane wings should be made just prior
to takeoff.
Engine run–up (As required) ................................................ Accomplish
Takeoff in icing conditions must be preceded by a static run–up to as high
a thrust setting as practical (60% N1 recommended) for approximately 30
seconds and stable engine operation checked prior to start of takeoff run.
Climb and Cruise
Nacelle Anti–Ice Operation
Nacelle anti–ice must be used during all flight operations when icing conditions
exist or are anticipated, except when the temperature is below –40°C SAT.
When operating in areas of possible icing, activate nacelle anti–ice prior to
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