Abstract: An aircraft dolly includes a plate having opposing mirror-imaged longitudinal sides. Each side includes a continuous first portion and a second portion of spaced-apart fingers contiguous with the first portion. A support disposed at each side of the plate includes a tube of triangular cross-section. The tube has a first leg, a second leg inboard of the first leg and coupled thereto, and a third leg consisting of the first portion of the plate extending between the first and second legs. Each support also includes a horizontal member coupled to the tube and extending over the plate's fingers, and a set of bracing members coupled to the fingers and the horizontal member. Casters are coupled to each horizontal member with each caster disposed between two adjacent fingers. One caster at each side is spring-biased away from its horizontal member. A ramp engages the plate and a ground surface.

Abstract: A duct coupling apparatus includes a collar portion having a first end and a second end, a flange disposed about the collar portion in a manner that divides the collar portion into an first side and a second side, and a retaining structure extending from a surface of the flange towards the second side of the collar portion. The retaining structure and the collar portion define therebetween an annular region for receipt of a sealing element, such as an o-ring or gasket. The retaining structure prevents the sealing element from extruding outwards and/or failing when under pressure.

Abstract: A duct coupling apparatus includes a collar portion having a first end and a second end, a flange disposed about the collar portion in a manner that divides the collar portion into an first side and a second side, and a retaining structure extending from a surface of the flange towards the second side of the collar portion. The retaining structure and the collar portion define therebetween an annular region for receipt of a sealing element, such as an o-ring or gasket. The retaining structure prevents the sealing element from extruding outwards and/or failing when under pressure.