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 ground. The engine anti-ice (EAI) Annunciation appears 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 fails.
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 ice is detected, the engine anti-ice valves open and bleed air is automatically supplied to the engine cowl inlets.
When ice is no longer detected, the engine anti-ice valves close and bleed air is no longer supplied to the engine cowl inlets.
ENGINE ANTI-ICE SYSTEM MANUAL OPERATION
On the ground or in flight, turning the engine anti-ice selectors on allows engine bleed air to anti-ice the engine cowl inlets. The selectors must be no for the engine anti-ice system to operate on the ground.
ENGINE ANTI-ICE LEAK DETECTION SYSTEM
Each engine has a dual loop anti-ice system duct leak detection system. If an anti-ice duct leak is detected, the affected engine anti-ice valve closes.