Apparatus for starting aircraft engines and for operating auxiliary on-board power generating equipment

Apparatus for driving auxiliary on board equipment of an aircraft independently from any aircraft engine, comprising:

• a first and a second plurality respectively of auxiliary equipment and of emergency equipment, each plurality including at least one distribution transmission gearing, an electric generator and a hydraulic pump both drivingly connected to the respective gearing, each of said pluralities establishing a power pack operating independently from the respective other one, so that both or either can provide for the respective electric and hydraulic power in the aircraft;
• a gas turbine with output shaft means;
• first and second clutch means, for selectively connecting the gearings of the two pluralities to said gas turbine, so that the gas turbine can drive the auxiliary equipment of the first plurality without driving the emergency, equipment of the second plurality;
• an auxiliary turbine connected to drive the gearing of the second plurality;
• the first clutch means respectively connecting or disconnecting the second gearing to the shaft means for said auxiliary turbine to start said gas turbine or drive said second emergency equipment only;
• and
• the second clutch means disconnecting the shaft means from the first auxiliary equipment when the auxiliary turbine starts the gas turbine, but connecting the shaft means to the first auxiliary equipment for being driven by the gas turbine.

Apparatus for driving on board auxiliary equipment independently from any aircraft engine and by means of a gas turbine serving also as starter for an aircraft engine, comprising:

• a first plurality of auxiliary equipment including at least a hydraulic pump and an electric generator as secondary energy supplier;
• a first gear train for drivingly interconnecting the equipment of the first plurality;
• a second plurality of emergency equipment including also a hydraulic pump and an electric generator;
• a second gear train for drivingly interconnecting the equipment of the second plurality;
• an auxiliary turbine connected for driving said second gear train to thereby drive the equipment of the second plurality;
• and
• clutch means for completing one of the selective connections at a time;
• connection of the first gear train to the gas turbine whhen the gas turbine runs;
• connection of the second gear train to the gas turbine for being started by the auxiliary turbine while disconnecting the first gear train from the gas turbine.

Apparatus for starting an aircraft engine and driving auxiliary equipment, comprising as auxiliary gas turbine connected to said aircraft engine for driving it for purposes of starting the engine;

• means for providing compressed air to said gas turbine;
• a plurality of auxiliary equipment including at least one distribution transmission gearing, an electric generator and a hydraulic pump both drivingly connected to the gearing, further including a decompression turbine and an auxiliary compressor, both being also drivingly connected to said gearing, the decompression turbine providing load relief and feeding conditioned air resulting from decompression in the decompression turbine into the aircraft cabin;
• the transmission gearing being connected to the gas turbine and being driven therefrom, whereby the decompression turbine acts as load relief for the gas turbine;
• a heat exchanger connected to receive and pass through compressed air from said auxiliary compression during at least some periods of operation and feeding in turn said decompression turbine;
• and
• means for feeding a separate air flow through the said heat exchanger to enter into heat exchange with the compressed air as passing through the heat exchanger.