Page 1 D633W101-BEJ Sep 05/2002
ENGINE ANTI-ICE -INTRODUCTION
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EEC (electronic engine control)
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WOW (weight on wheels cards)
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ADIRU (air data inertial reference unit)
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ASCPC (air supply cabin pressure controller)
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EDIU (engine data interface unit).
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777 AIRCRAFT MAINTENANCE MANUAL
ENGINE ANTI-ICE -INTRODUCTION
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ENGINE ANTI-ICE -ENGINE COMPONENT LOCATIONS
Component Locations
The engine anti-ice (EAI) components are in these locations:
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Engine core -left side
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Engine fan case -right side
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Engine inlet -left side.
These are the components on the engine core:
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EAI valve
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EAI duct
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Controller air cooler.
These are the components on the engine fan case:
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EAI valve controller
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EAI pressure sensors
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EAI duct.
The left side of the engine inlet has the EAI exhaust port.
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ENGINE ANTI-ICE -ENGINE COMPONENT LOCATIONS
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ENGINE ANTI-ICE -FLIGHT DECK AND MEC COMPONENT LOCATIONS
Component Locations
Controls for the EAI system are on the anti-ice/lighting panel (P5).
The ACIPS -EAI cards (left and right) are in the left and right systems card files.
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ENGINE ANTI-ICE -FLIGHT DECK AND MEC COMPONENT LOCATIONS
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ENGINE ANTI-ICE -EAI VALVE
Purpose
The EAI valve controls the flow of engine bleed air though the EAI duct to the engine cowl leading edge.
Physical Description
The EAI valve is a pneumatically-operated, piston-type valve. The valve has these parts:
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Body
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Locking screw
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Locking crank
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Control pressure line connector.
Location
The EAI valve is on the left side of the engine core at the 8:00 position. The valve is in the EAI duct above the integrated drive generator (IDG), aft of the gearbox.
Functional Description
The piston freely slides on the guide tube. Control pressure pushes on the inner part of the piston to open the valve and control flow. Air from the high pressure bleed air source pushes on the outer part of the piston to move it to the closed position.
The locking screw and locking crank let you manually set the EAI valve for normal operation (unlocked position) or to the locked closed position. The locking screw keeps the locking crank in its unlocked position for normal valve operation or in the valve locked closed position. When you remove the screw from its stowed position, it lets control pressure vent and the locking crank move. When you move the locking crank to CLOSED and install the locking screw, the crank holds the piston in the closed position.
Training Information Point
You use the EAI valve controller (not shown) to manually set the EAI valve open.
See the procedure in part II of the AMM, Preparation -Engine Anti-ice Systems Inoperative, for more information on deactivation of the engine anti-ice valve open.
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777 AIRCRAFT MAINTENANCE MANUAL
ENGINE ANTI-ICE -EAI VALVE
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ENGINE ANTI-ICE -EAI VALVE CONTROLLER
Purpose
The EAI valve controller supplies control pressure to the EAI valve.
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