THE electrical supply system is designed to provide both 200 volt a.c. and 28 volt d.c. services for operation of the aircraft. Although electrical power is required for the operation of the auto‐stabiliser system, this is not essential for flight and the flying controls are non‐electric. The aircraft does not therefore, depend on the integrity of the electrical system for flight. Loads, such as undercarriage lowering selection etc., required to operate if a total generation failure has occurred, are all d.c. and are fed by the main aircraft batteries. As a further precaution basic flight and communication facilities can also be powered in an emergency from a standby battery which is not charged in flight and is therefore independent of any of the normal aircraft services.
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