AMC
25.1305(c)(5) Powerplant ice protection system functioning indication
ED Decision 2018/005/R
In addition to an indication of the functioning of each nacelle ice protection system, an indication of the functioning of each engine ice protection system should be provided under the following conditions:
1. If the engine ice protection system requires a flight crew action to operate it (i.e. the system is manual), and
2. If the engine ice protection system does not require a flight crew action to operate it (i.e. the system is automatic, or it functions permanently), unless all of the following conditions are met:
— The engine thrust/torque and aeroplane performance are not significantly affected by the engine ice protection system switching on/off;
— There is no significant effect of the engine ice protection system switching on/off on the flight deck instruments, controls (such as the throttle lever) and the flight deck environment (such as noise);
— The engine ice protection system failures are indicated to the flight crew; and
— The indication of the functioning of the engine ice protection system is not used to indicate to the flight crew that the aircraft is operating in an icing environment, requiring, for example, the flight crew to apply an AFM procedure to protect the engine against the effects of the icing environment.
[Amdt 25/21]
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