An aircraft includes a fuselage that has an exterior contour with an opening and a duct that is arranged interiorly of the exterior contour and extends from the opening. A ram air turbine is arranged within the duct. A deployable inlet scoop is mounted on the fuselage and is configured to be moveable between stowed and deployed positions. The stowed position blocks the opening into the duct and the deployed position exposes the opening and permits airflow through the duct. A method of providing electrical power includes identifying an electrical power demand condition, deploying an inlet scoop from an aircraft fuselage, and driving a ram air turbine with an airflow through the inlet scoop into the fuselage.

A toggle release mechanism comprises a base element and a toggle element rotatably mounted at a first end to the base element about a first axis for rotation between a first, locking position and a second, release position. The mechanism further comprises a link element mounted at a first end to a second end of the toggle element about a second axis parallel to the first axis. The first end of the toggle element comprises a first stop and the base element comprises a second stop opposed to the first stop. The first stop and the second stop are in contact when the toggle element is in its locked position, preventing rotational movement of the toggle element in one rotational direction.

A release mechanism comprises a locking body mounted for reciprocating movement in a first axial direction between a locked position and a released position. A force transmitting element is coupled to the locking body for transmitting a force (F) to the locking body for moving the locking body from the locked position to the released position. A biasing element acts on the locking body in a direction for moving the locking body from the released position to the locked position. The locking body comprises a slot having a first slot portion extending in said first direction, and a second slot portion extending transversely from one side of said first slot portion at an end thereof. The slot slidably receives an actuating element therein.

A ram air turbine (RAT) mounting system includes a frame with a forward end having a first side, a second side disposed opposite the first side, a third side, and a fourth side disposed opposite the third side. The frame also includes an aft end. A first mounting element is connected to the forward end of the frame proximate the first side and the third side. A second mounting element is connected to the forward end of the frame proximate the first side and the fourth side. A first rod is connected to the forward end of the frame proximate the second side and the third side. A second rod is connected to the aft end of the frame.

An auxiliary power unit system of an aircraft includes an auxiliary power unit (APU), a cooling unit for the APU including a heat exchanger, an air inlet in communication with the APU and/or with the cooling unit, an air inlet door unit located at the air inlet, a first duct configured to draw air into the APU and having an entrance in communication with the air inlet, a second duct having an entrance in communication with the air inlet, the heat exchanger being at least partially located within the second duct, an air turbine located within the second duct downstream of the heat exchanger, and an electrical generator coupled to the air turbine.

A fluid accelerator including an outer housing having an inlet end and an outlet end, the outer housing defining a converging nozzle proximate the inlet end. The fluid accelerator may also include an annular ring disposed proximate the inlet end of the outer housing within the converging nozzle, wherein the annular ring has an airfoil cross-sectional shape.