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engine is shutdown.
Engine Anti–Ice System Automatic Operation
In flight, when the ENGINE ANTI–ICE selector is in AUTO, engine anti–ice
system operation is automatic. When icing conditions are detected, the engine
anti–ice valves open and engine bleed air is supplied to the engine inlet cowl.
When icing conditions are no longer detected, the engine anti–ice valves close and
bleed air is no longer supplied to the engine inlet cowl.
Automatic operation of the engine anti-ice system is inhibited on the ground.
Engine Anti–Ice System Manual Operation
On the ground or in flight, when the ENGINE ANTI–ICE selector is ON, engine
bleed air opens the engine anti-ice valve and bleed air is supplied to the engine
inlet cowl.
• automatic ice detection
• engine anti–ice
• wing anti–ice
• cabin air compressor inlet
anti–ice
• flight deck window heat
• windshield wipers and washers
• probe heat.
787 Flight Crew Operations Manual
Anti-Ice, Rain -
System Description
3.20.2 Boeing Proprietary
The engine anti-ice valves close automatically:
Engine Anti–Ice Leak Detection System
Each engine has an anti–ice system duct leak detection system. If an anti–ice duct
leak is detected, the respective engine anti–ice valve closes.
Wing Anti–Ice System
The electric wing anti–ice system powers thermal anti-icing mats on four midwing
leading edge slats on each wing. There are three separate mats on each slat. Wing
anti–ice is inhibited on the ground below 80 knots. Wing anti-ice may be
momentarily shed (30 seconds maximum) during high electrical loads, such as
during flap retraction. To maintain aerodynamic stability, system logic controls
symmetrical operation of left and right wing anti-ice.
The wing anti–ice annunciation WAI is displayed below the EICAS N1 indication
when wing anti–ice is powered.
Wing Anti–Ice System Automatic Operation
In flight, when the WING ANTI–ICE selector is in AUTO, wing anti–ice system
operation is automatic. When icing conditions are detected, power is supplied to
the thermal mats on the leading edge slats. When ice is no longer detected, power
is removed. If one wing anti–ice thermal mat fails, the wing anti–ice system
automatically de-powers the opposite thermal mat to prevent asymmetrical wing
icing.
Automatic wing anti–ice operation is available in flight and on the ground above
80 knots airspeed.
Wing Anti–Ice System Manual Operation
In flight, when the WING ANTI–ICE selector is ON the wing anti–ice system on
each wing is powered anytime TAT is below 10 degrees C.
Pack Inlet Anti-Ice System
The pack inlet anti-ice system provides ice protection for the leading edge of the
two cabin air compressor inlets. An electric heater on each ram inlet prevents ice
formation and reduces ice formation in the duct during icing conditions.
• during start
• for engine bleed air
overtemperature
• for engine bleed air
overpressure
• when an engine fire switch is
pulled
787 Flight Crew Operations Manual
Anti-Ice, Rain -
System Description
Boeing Proprietary 3.20.3
Pack inlet anti-ice functions automatically with signals from the automatic ice
detection system. Operation is inhibited on the ground and when TAT is above 10
degrees C.
Anti–Ice System Schematic
OFF ON
AUTO
WING
OFF ON
ANTI-ICE
AUTO
L
OFF ON
AUTO
ENGINE R
Engine Anti–Ice Valves
Wing Ice Protection
System (WIPS)
AC1 AC2
PRELIMINARY
787 Flight Crew Operations Manual
Anti-Ice, Rain -
System Description
3.20.4 Boeing Proprietary
Flight Deck Window Heat
All flight deck windows are electrically heated. The forward windows have
exterior surface anti–icing, and interior surface antifogging protection. The side
windows have interior surface antifogging protection only.
The WINDOW HEAT switches control heating for all flight deck windows.
A backup antifogging system for the forward windows operates automatically if
the primary window heat system fails.
Windshield Wipers/Washers
The forward windows are equipped with independently controlled, three–speed
wipers. When the WIPER selector in OFF, the respective wiper is off and stowed.
The Captains and First Officers windshields are equipped with a windshield
washer system. Windshield washer switches command a continuous application
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787机组操作手册Flight Crew Operations Manual 1(133)
