Patent ID: 7124662

Claim:
A method for powering respective first and second propeller control unit (PCU) pumps of respective first and second propeller engines of a multi-engine aircraft, the first and second engines having respective pump driving shafts which rotate in opposite rotational directions relative to one another when the aircraft is operated, the method comprising the steps of: providing a driven shaft of the first PCU pump disposed at an angle with respect to the pump driving shaft of the first engine; providing a driven shaft of the second PCU pump disposed at said same angle with respect to the pump driving shaft of the second engine; providing a first gear set mechanically connecting the pump driving shaft of the first engine to the driven shaft of the first PCU pump, the first gear set adapted to drive the first PCU pump in a rotational direction; and providing a second gear set mechanically connecting the pump driving shaft of the second engine to the driven shaft of the second PCU pump, the second gear set adapted to drive the second PCU pump in the same rotational direction as the first PCU pump, wherein the first gear set and second gear set differ by one gear.