787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC SP.16.9
Fan Ice Removal
CAUTION: Avoid prolonged operation in moderate to severe icing
conditions.
If moderate to severe icing conditions are encountered:
[Option – GE engines]
During flight in moderate to severe icing conditions for prolonged
periods with N1 settings at or below 70%, or when fan icing is
suspected due to high engine vibration, the fan blades must be
cleared of any ice. Do the following procedure every 15 minutes on
both engines, one engine at a time: reduce thrust toward idle then
increase to a minimum of 70% N1 for 10 to 30 seconds.
[Option – GE engines]
Note: Operation in icing conditions may result in displayed vibration
levels up to and exceeding the normal operating range.
Extended operation at high vibration levels in icing conditions
will not result in engine damage.
[Option – RR engines]
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. Do 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.
February 13, 2009
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