Abstract: Apparatuses, systems, and methods comprising acoustically absorptive air ducts comprising an internally positioned structure component as an endoskeleton and an air impervious inner layer, and an acoustically absorptive foam outer layer, environmental control systems comprising such air ducts, and vehicles incorporating such environmental control systems are disclosed with methods for manufacture and installations are disclosed.

Abstract: A disc pack includes stacked disc plates defining a first side and second side of the disc pack. Bolt holes extend through the sides of the disc pack and define a bolt circle. Bushings extend through the bolt holes. Each bushing includes a head at a first end bearing against the first side of the disc pack and a second end that extends axially outside the bolt hole. A washer surrounds at least a portion of the second end and bears against the second side of the disc pack to hold the disc plates together. The disc pack is configured to increase from a first diameter defined by the bolt circle to a second diameter defined by the bolt circle that is at least 0.37% greater than the first diameter when the disc pack is pre-stretched.

Abstract: Apparatuses, systems, and methods comprising acoustically absorptive air ducts comprising an internally positioned structure component as an endoskeleton and an air impervious inner layer, and an acoustically absorptive foam outer layer, environmental control systems comprising such air ducts, and vehicles incorporating such environmental control systems are disclosed with methods for manufacture and installations are disclosed.

Abstract: Apparatuses, systems, and methods comprising acoustically absorptive air ducts comprising an internally positioned structure component as an endoskeleton and an air impervious inner layer, and an acoustically absorptive foam outer layer, environmental control systems comprising such air ducts, and vehicles incorporating such environmental control systems are disclosed with methods for manufacture and installations are disclosed.

Abstract: A coupling assembly includes a body member and at least one end member attached to the body member. At least one connection arrangement is situated between the body member and the at least one end member, respectively. The at least one connection arrangement includes a plurality of bushings. A plurality of fasteners are each respectively received by the plurality of bushings to fasten the body member to the at least one end member. Each one of the plurality of bushings are rotationally fixed about their center longitudinal axes by the at least one connection arrangement.