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ground) or TAT (in-flight) is above 10°C.
Exterior Inspection - Captain or First Officer
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 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 permissible;
however, all leading edge devices, all control surfaces, and upper
wing surfaces must be free of snow or ice.
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.
Landing gear doors .........................................................................Check
Landing gear doors should be free of snow and ice.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary SP.16.3
Air conditioning inlets and exits...................................................... Clear
Verify that the air inlets and exits, including the outflow valves, are
free of snow and ice.
Engine inlets .................................................................................... Clear
Verify that the inlet cowling is free of snow and ice.
APU air inlets ............................................................................... Check
The APU inlet door must be free of snow and ice before APU start.
Fuel tank vents ................................................................................. Clear
Check all fuel tank vents. All traces of ice and frost should be
removed.
Pitot probes and static ports ............................................................. Clear
Verify that all pitot probes and static ports are free of snow and ice.
Water rundown after snow removal may freeze immediately
forward of static ports and cause an ice buildup which disturbs
airflow over the static ports resulting in erroneous static readings
even when static ports are clear
Engine Start Procedure
Do the normal Engine Start Procedure with the following considerations:
• Oil pressure may be slow to rise
• Initial oil pressure rise may be higher than normal
• Additional warm-up time may be needed to allow oil temperature
to reach the normal range.
• Displays may require additional warm-up time before displayed
engine indications accurately show changing values. Displays may
appear less bright than normal.
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.4 Boeing Proprietary
Engine Anti-ice Operation - On the Ground
Engine anti-ice must be selected ON immediately after both engines are
started and remain on during all ground operations when icing
conditions exist or are anticipated, except when the temperature is
below –40°C OAT.
WARNING: 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.
CAUTION: Do not use engine anti-ice when OAT is above 10°C.
When engine anti-ice is needed:
ENGINE ANTI-ICE selectors ....................................ON F/O
When engine anti-ice is no longer needed:
ENGINE ANTI-ICE selectors ...............................AUTO F/O
Before Taxi Procedure
Do the normal Before Taxi Procedure with the following modifications:
If taxi route is through slush or standing water in low temperatures or
if precipitation is falling with temperatures below freezing, taxi out
with the flaps up. Taxiing with the flaps extended subjects the flaps and
flap drives to snow and slush accumulations from the main gear wheels.
Leading edge devices are also susceptible to slush accumulations.
Call “FLAPS ___” as needed. C
Flap lever ................................................ Set flaps, as needed F/O
787 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary SP.16.5
Taxi–Out
CAUTION: Taxi at a reduced speed. Use smaller tiller and rudder
　
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