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inputs, and apply minimum thrust evenly and smoothly.
Taxiing on slippery taxiways or runways at excessive
speed or with high crosswinds may start a skid.
When engine anti-ice is required and the OAT is 3°C or below, do an
engine run up, as needed, to minimize ice build-up. Use the following
procedure: C
Check that the area behind the airplane is clear.
Run-up to a minimum of (TBD)% N1 for approximately (TBD)
second duration at intervals no greater than 60 minutes.
De-icing / Anti-icing
Testing of undiluted de-icing/anti-icing fluids has shown that some of the
fluid remains on the wing during takeoff rotation and initial climb. The
residual fluid causes a temporary decrease in lift and increase in drag,
however, the effects are temporary. Takeoff operations with reduced thrust
(assumed temperature method or fixed derate) are permitted provided
takeoff performance accounts for the runway surface condition. Use the
normal takeoff rotation rate.
CAUTION: Operate the APU during de-icing only if necessary. If the
APU is running, ingestion of de-icing fluid causes
objectionable fumes and odors to enter the airplane.
Ingestion of snow, slush, ice, or de-icing/anti-icing fluid
can also cause damage to the APU.
If de-icing / anti-icing is needed:
APU .......................................................................As needed F/O
The APU should be shut down unless APU operation is necessary.
Flaps ................................................................................. UP F/O
Prevents ice and slush from accumulating in flap cavities during
de-icing.
Thrust levers .................................................................... Idle C
Reduces the possibility of injury to personnel at inlet or exhaust
areas.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.6 Boeing Proprietary
PACK switches ..................................................................................OFF
After de-icing / anti-icing is completed:
APU ................................................................. As needed F/O
Before Takeoff Procedure
Do the following steps after clear of snow and slush but before completing
the normal Before Takeoff Procedure:
Call “FLAPS ___” as needed for takeoff. PF
Flap lever ....................................Set takeoff flaps, as needed PM
Extend the flaps to the takeoff setting at this time if they have been
held because of slush, standing water, or icing conditions, or
because of exterior de-icing / anti-icing.
Engine oil temperature .................................Minimum 50° C PF
Oil temperature must be at least 50° C before takeoff.
When engine anti-ice is required and the OAT is 3°C or below, the
takeoff must be preceded by a static engine run-up. Use the following
procedure:
Run-up to a minimum of 50% N1 and confirm stable engine
operation before the start of the takeoff roll.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary SP.16.7
Engine Anti-ice Operation - In-flight
Engine anti–ice must be AUTO or ON during all flight operations when
icing conditions exist or are anticipated, except when the temperature
is below –40°C SAT.
CAUTION: Do not use engine anti-ice when TAT is above 10°C.
Manual Use of Engine Anti-ice
When using the engine anti-ice system manually in areas of possible
icing, activate engine anti–ice before entering icing conditions.
WARNING: If using the engine anti–ice system manually, do not
rely on airframe visual icing cues before activating
engine anti–ice. Use the temperature and visible
moisture criteria because late activation of engine
anti-ice may allow excessive ingestion of ice and result
in engine damage or failure.
When manual use of engine anti-ice is needed:
ENGINE ANTI–ICE selectors ....................................ON PM
When manual use of engine anti-ice is no longer needed:
ENGINE ANTI–ICE selectors ..................AUTO or OFF PM
Fan Ice Removal
CAUTION: Avoid prolonged operation in moderate to severe icing
conditions.
If moderate to severe icing conditions are encountered:
During flight in moderate to severe icing conditions for prolonged
periods, if fan icing is suspected due to high engine vibration, the
fan blades must be cleared of any ice. Perform the following
procedure on both engines, one engine at a time: quickly reduce
thrust to idle for 5 seconds then restore the required thrust. If
vibration persists, advance thrust lever to 90% N1 momentarily.
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787机组操作手册Flight Crew Operations Manual 1(34)
