Abstract: A secondary power unit for an aircraft comprises a gas turbine engine having at least one drive shaft, a twin-load compressor including first and second load compressors both coupled with the drive shaft, a first ram-air intake in fluid communication with the twin-load compressor, and a flow regulating arrangement coupled with the first and second compressors outputs to individually regulate the generated flow of compressed air. The flow regulating arrangement is also adapted to be fluidly communicated with an Air Cycle Machine of an aircraft, and a control system is adapted to feed the flow of compressed air as bleed air to the Air Cycle Machine of an aircraft, both when the aircraft is on ground and in flight. The secondary power unit is capable of avoiding bleed air extraction from the main engines with the aim of reducing fuel consumption.

Abstract: An aircraft tailcone comprising a tailcone fuselage, a turbomachine, for example an APU, housed inside the tailcone, a ram air intake on the tailcone fuselage for the ingestion of ram air towards the interior of the turbomachine compartment, an inlet flap operable reciprocately from an open position in which ingestion of ram air is allowed, and a closed position in which ram air ingestion is prevented. The ram air intake extends annularly along a perimeter of the tailcone fuselage, and the inlet flap is configured such in its closed position that a surface of the inlet flap is substantially flush with the tailcone fuselage.

Abstract: A suspension system for an aircraft auxiliary power unit (1) located in a fuselage structure (2) including: auxiliary power unit attachment brackets (3) arranged to be attached to the auxiliary power unit (1); fuselage attachment brackets (4) attached to the auxiliary power unit attachment brackets (3) and coupled to the fuselage structure (2); two longitudinal elements (5) arranged to be attached to the fuselage structure (2) in the longitudinal direction of the aircraft for supporting the auxiliary power unit (1), the two longitudinal elements (5) and the plurality of fuselage attachment brackets (4) being connected such that the two longitudinal elements (5) support the plurality of fuselage attachment brackets (4), being the fuselage attachment brackets (4) slidably movable along the longitudinal elements (5) for introducing or extracting the auxiliary power unit (1) into the fuselage structure (2).

Abstract: A secondary power unit for an aircraft comprises a gas turbine engine having at least one drive shaft, a twin-load compressor including first and second load compressors both coupled with the drive shaft, a first ram-air intake in fluid communication with the twin-load compressor, and a flow regulating arrangement coupled with the first and second compressors outputs to individually regulate the generated flow of compressed air. The flow regulating arrangement is also adapted to be fluidly communicated with an Air Cycle Machine of an aircraft, and a control system is adapted to feed the flow of compressed air as bleed air to the Air Cycle Machine of an aircraft, both when the aircraft is on ground and in flight. The secondary power unit is capable of avoiding bleed air extraction from the main engines with the aim of reducing fuel consumption.

Abstract: An aircraft tailcone comprising a tailcone fuselage, a turbomachine, for example an APU, housed inside the tailcone, a ram air intake on the tailcone fuselage for the ingestion of ram air towards the interior of the turbomachine compartment, an inlet flap operable reciprocately from an open position in which ingestion of ram air is allowed, and a closed position in which ram air ingestion is prevented. The ram air intake extends annularly along a perimeter of the tailcone fuselage, and the inlet flap is configured such in its closed position that a surface of the inlet flap is substantially flush with the tailcone fuselage.

Abstract: A door system configured to be attached to the fuselage of a tail cone of an aircraft wherein the tail cone comprises an exhaust gas duct of an auxiliary power unit of the aircraft and an opening of the exhaust gas duct located at the rear part of the tail cone. The door system comprises a door which is movable between an open and a closed position, the door being configured such that, in the closed position, it covers the opening of the exhaust gas duct and that the door being shaped such that it follows the aerodynamic shape of the fuselage of the tail cone in its closed position.

Abstract: A suspension system for an aircraft auxiliary power unit (1) located in a fuselage structure (2) including: auxiliary power unit attachment brackets (3) arranged to be attached to the auxiliary power unit (1); fuselage attachment brackets (4) attached to the auxiliary power unit attachment brackets (3) and coupled to the fuselage structure (2); two longitudinal elements (5) arranged to be attached to the fuselage structure (2) in the longitudinal direction of the aircraft for supporting the auxiliary power unit (1), the two longitudinal elements (5) and the plurality of fuselage attachment brackets (4) being connected such that the two longitudinal elements (5) support the plurality of fuselage attachment brackets (4), being the fuselage attachment brackets (4) slidably movable along the longitudinal elements (5) for introducing or extracting the auxiliary power unit (1) into the fuselage structure (2).