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Note: After the flaps are up, wing anti–ice should be used to melt any accumulation of slush.
The secondary method is to use wing anti-ice prior to ice accumulation. Operate the wing anti–ice system as an anti–icer only during extended operations in moderate or severe icing conditions, such as holding.
Ice accumulation on the flight deck window frames, windshield center post, or windshield wiper arm, or side windows may be used as an indication of structural icing conditions and the need to turn on wing anti–ice.
Normally, it is not necessary to shed ice periodically unless extended flight through icing conditions is necessary (holding).
CAUTION: Do not operate wing anti-ice when total air temperature (TAT) is above 10°C (50°F).
Note: Wing anti-icing is not effective with leading edge flaps extended. If icing conditions exist, turn wing anti-icing on after retraction of leading edge flaps; or complete wing anti-icing prior to extension of leading edge flaps.
Note: Prolonged operation in icing conditions with the leading edge
and trailing edge flaps extended is not recommended.

Secure
The flight crew should ensure the following actions are accomplished as required:
Copyright . The Boeing Company. See title page for details.
SP.16.6 D6-30151-425 April 01, 2001

Supplementary Procedures -Adverse Weather
747 Operations Manual
Outflow Valve Manual switches .........................................................ON
Outflow Valve Manual control .................................................... CLOSE

Inhibits intake of snow and ice. Wheel chocks....................................................................Check in place Parking brakes .................................................................................. OFF
Eliminates the possibility of brakes freezing.
Protective covers and plugs ........................................................Installed
Water storage containers..............................................................Drained
Toilets ..........................................................................................Drained
Doors ............................................................................................Closed

Hot Weather Operation
During flight planning, consider the following:
.  
high temperatures inflict performance penalties which must be
taken into account on the ground before takeoff

.  
alternate takeoff procedures (Packs Off Takeoff, APU-to-Pack

Takeoff, etc.) During ground operation, consider the following to help keep the airplane as cool as possible:
.  
all packs should be used (when possible) for maximum cooling

.  
recirculation fans should be off because the fans add warm air to
the conditioned air

.  
if cooling air is available from an outside source, the supply should
be plugged in immediately after engine shutdown and should not
be removed until just prior to engine start

.  
keep all doors and windows, including cargo doors, closed as much
as possible

.  
electronic components which contribute to a high temperature level
in the flight deck should be turned off while not needed

.  
all air outlets on flight deck should be open

Copyright . The Boeing Company. See title page for details.
April 01, 2001 D6-30151-425  SP.16.7
Supplementary Procedures -Adverse Weather 747 Operations Manual

.  close all window shades on the sun–exposed side of the passenger
cabin

Brake temperature levels may be reached which can cause the wheel fuse plugs to melt and deflate the tires. Consider the following actions:
.  
be aware of brake temperature buildup when operating a series of
short flight sectors. The energy absorbed by the brakes from each
landing is cumulative

.  
extending the landing gear early during the approach provides
additional cooling for tires and brakes

.  
in–flight cooling time can be determined from the “Brake Cooling
Schedule” in the Performance–In flight section

 

Engine Operation in Heavy Rain or Hail
If heavy rain or hail encountered or anticipated:
Continuous Ignition switch ........................................................... ON Provides flameout protection and maintains a minimum thrust setting of approach idle. Confirm CON IGNITION memo message is displayed.
During descent:
Autothrottles ................................................................ Disconnect

Note:  In heavy precipitation, engine parameter fluctuations may occur, particularly a noticeable drop in EGT. Engine parameters will return to normal immediately upon leaving the area of heavy precipitation.
　
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