787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Anti-Ice, Rain Chapter 3
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 3.20.1
3.20 Anti-Ice, Rain-System Description
Anti-Ice, Rain20 System DescriptionSystem Description
Introduction
The anti–ice and rain systems include:
Automatic Ice Detection System
The automatic ice detection system senses the existence of icing conditions. The
system consists of two icing condition detectors that measure liquid water content
and use TAT and other air data information to determine if icing conditions exist.
Both detectors are heated electrically after engine start. The system provides
signals to control the engine, wing, and pack inlet anti–ice systems.
Automatic ice detection is inhibited on the ground below 75 knots.
Engine Anti–Ice System
The engine anti–ice system uses engine bleed air to provide engine cowl inlet ice
protection. Engine anti–ice can be operated in flight or on the ground. The engine
anti–ice indication EAI is displayed above the EICAS N1 indication when an
engine anti–ice valve is open. The left and right engines have identical,
independent anti–ice systems. This allows the remaining system to operate if one
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
• pack inlet anti–ice
• flight deck window heat
• windshield wipers and washers
• probe heat
August 14, 2009
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