787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
SP.16.2 D615Z003-TBC
Cold Weather Operations
Considerations associated with cold weather operation are primarily
concerned with low temperatures and with ice, snow, slush, and standing
water on the airplane, ramps, taxiways, and runways. (Refer to Anti-Ice,
Rain in Chapter L, Section 10, for additional information.)
Icing conditions exist when OAT (on the ground) or TAT (in-flight) is 10°C
or below, and any of the following exist:
• visible moisture (clouds, fog with visibility of one statute mile
(1600m) or less, rain, snow, sleet, ice crystals, and so on) is present,
or
• ice, snow, slush, or standing water is present on the ramps,
taxiways, or runways.
CAUTION: Do not use engine anti-ice when OAT (on the ground) is
above 10°C. Do not use engine or wing anti-ice when
TAT (in-flight) is above 10°C.
Exterior Inspection
Although removal of surface snow, ice and frost is normally a maintenance
function, during preflight procedures, the captain or first officer should
carefully inspect areas where surface snow, ice or frost could change or
affect normal system operations.
Do the normal Exterior Inspection with the following additional steps:
Surfaces ..........................................................................................Check
Takeoff with light coatings of frost, up to 1/8 inch (3mm) in
thickness, on lower wing surfaces due to cold fuel is allowable;
however, all leading edge devices, all control surfaces, and upper
wing surfaces must be free of snow, ice and frost.
Thin hoarfrost is acceptable on the upper surface of the fuselage
provided all vents and ports are clear. Thin hoarfrost is a uniform
white deposit of fine crystalline texture, which usually occurs on
exposed surfaces on a cold and cloudless night, and which is thin
enough to distinguish surface features underneath, such as paint
lines, markings or lettering.
August 14, 2009
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