Rolls-Royce Corporation

Huw Llewellyn Edwards

Stephen Mark Husband

Christopher Graham Bright

Parag Vyas

A method of controlling an aircraft electrical system (). The electrical system () comprises an alternating current electrical machine () comprising a plurality of phases, each phase having a power rating, the electrical machine () being configured to operate on failure of one or more phases. The method comprises: determining a power requirement; sensing a fault of one or more phases of the electrical machine (), and controlling the electrical machine () to operate in a fault condition, in which the remaining phases of the electrical machine () provide the electrical power requirement; and providing an overrating signal to a flight computer () of the aircraft () where the power provided by each phase exceeds the power rating of the respective phase.

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Derby, United Kingdom

Huw Llewellyn Edwards