Auxiliary power unit inlet
AssigneeHamilton Sundstrand Corporation
InventorsStacey H. Light, Jack V. Vitale
Life of this patent
Estimating the term…
Abstract
An aircraft auxiliary power unit assembly includes an aircraft skin that provides a cavity. It is secured to a structure in an assembled condition and it provides an opening. An auxiliary power unit is arranged within the cavity and is secured to the structure. The aircraft skin substantially covers the auxiliary power unit in the assembled condition. An inlet duct that is removable is secured within the opening and is selectively connected to the auxiliary power unit between the installed and service positions. The installed and service positions are with the aircraft skin in the assembled condition.
Claims8
An aircraft auxiliary power unit assembly comprising:
- an auxiliary power unit configured to be installed within a cavity provided by an aircraft skin and the auxillary power unit configured to be secured to an aircraft structure with the aircraft skin substantially covering the auxiliary power unit;
- an inlet duct configured to be removably secured within a fixed opening in the aircraft skin and selectively connected to the auxiliary power unit between installed and service positions;
- wherein the installed and service positions are within the aircraft skin, and the service position is further configured to have the inlet duct detached from the aircraft skin and the structure, wherein the inlet duct is configured to be removed and installed through the opening as an assembled unit.
An inlet duct for an auxiliary power unit comprising:
- an inlet duct configured to be removably secured within an opening in an aircraft skin and selectively connected to an auxiliary power unit between installed and service positions;
- the inlet duct defining a passage and including first and second flanges arranged on the duct at opposite ends of the passage, the first flange including apertures configured to receive fastening elements, the first flange having an outer perimeter configured to be larger than the opening within which the first flange is to be secured relative to in the installed position, wherein the inlet duct is configured to be removed and installed through the opening as an assembled unit;
- a seal secured to the second flange;
- and
- silencing elements arranged within the passage.
Dependencies are inferred from the claim text.