787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Supplementary Procedures -
Adverse Weather
Copyright © The Boeing Company. See title page for details.
SP.16.10 D615Z003-TBC
Wing Anti-ice Operation - In-flight
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.
The wing anti–ice system may be used as a de–icer or anti–icer in flight
only. The primary method is to use the automatic ice detection system
which acts as a de–icer by allowing ice to accumulate before turning
wing anti–ice on. This procedure provides the cleanest airfoil surface,
the least possible runback ice formation, and the least thrust and fuel
penalty.
The secondary method is to select the WING ANTI–ICE selector ON
when wing icing is possible and use the system as an anti–icer.
CAUTION: Do not use wing anti-ice when TAT is above 10°C.
Manual Use of Wing Anti-ice
When manual use of wing anti–ice is needed:
WING ANTI–ICE selector ......................................... ON PM
When manual use of wing anti–ice is no longer needed:
WING ANTI–ICE selector ....................................... OFF PM
The WING ANTI-ICE OFF advisory message is shown when the
WING ANTI–ICE selector is in the OFF position.
Cold Temperature Altitude Corrections
Extremely low temperatures create significant altimeter errors and greater
potential for reduced terrain clearance. When the temperature is colder
than ISA, true altitude will be lower than indicated altitude. Altimeter
errors become significantly larger when the surface temperature
approaches -30°C or colder, and also become larger with increasing height
above the altimeter reference source.
Apply the altitude correction table when needed:
• no corrections are needed for reported temperatures above 0°C or if
the airport temperature is at or above the minimum published
temperature for the procedure being flown.
• do not correct altimeter barometric reference settings
February 15, 2010
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