Flush Aircraft Door Handle with Hinged Cover
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Solution Overview
Problem
Aircraft exterior door handles increase aerodynamic drag and are aesthetically unappealing due to their protrusion from the fuselage, while also complicating access and maintenance.
Innovation Solution
An integrated flush door handle assembly with a hinged access cover that conceals the handle within the access panel skin, using spring-loaded hinges to bias the cover towards a closed position, allowing the handle to be exposed only when needed, thus minimizing weight, cost, and aerodynamic drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protruding door handle is installed on the aircraft exterior, then the handle provides functional access for door operation, but it increases aerodynamic drag and creates aesthetic issues
Solution Approach 1:
The door handle is designed to be dynamically concealed within a recessed cavity in the aircraft skin, with a cover that can be opened only when needed for door operation. This dynamic concealment eliminates the handle from the aerodynamic flow during flight, reducing drag while maintaining accessibility when required.
Solution Approach 2:
The handle assembly is nested within a recessed cavity in the aircraft skin, with the handle, cover, and hinge mechanism all contained within the skin structure. This nesting approach allows the handle to be hidden during normal operation while remaining accessible when the cover is opened.
2Ease of operation
If a protruding door handle is installed on the aircraft exterior, then the handle provides functional access for door operation, but it adds weight and increases manufacturing complexity
Solution Approach 1:
The handle assembly is merged with the aircraft skin structure, where the skin itself forms the housing and mounting structure for the handle, cover, and hinge mechanism. This integration eliminates separate mounting brackets and simplifies the overall assembly, reducing both weight and manufacturing complexity.
Solution Approach 2:
The aircraft skin serves multiple functions: it provides the aerodynamic surface, houses the handle assembly, provides structural support for the hinge mechanism, and acts as the mounting structure for the cover. This multi-functionality reduces the number of separate components needed.
3Object-affected harmful factors
If the door handle is concealed within the access panel skin, then aerodynamic drag is reduced and aesthetics are improved, but access and maintenance become more difficult
Solution Approach 1:
The handle assembly is segmented into separable components (handle, cover, hinge mechanism) that can be independently accessed and maintained. The cover can be removed to provide access to the handle and hinge mechanism for maintenance purposes, while maintaining the concealed appearance during normal operation.
4Weight of moving object
If the cover is made lightweight to minimize weight, then overall weight is reduced, but the cover may lack sufficient structural integrity
Solution Approach 1:
The cover is designed as a thin-walled structure that provides sufficient structural integrity for its protective function while minimizing weight. The thin-walled design is adequate because the cover only needs to protect the handle mechanism, not withstand significant aerodynamic loads.
Data Source
AI summary
A handle assembly for an access panel is described and includes a handle connected to a support structure integrated into and covered by a skin of the access panel, the handle comprising a grip portion and upper and lower flanges extending perpendicularly from the grip portion and having first ends connected to the grip portion and second ends connected to the support structure; and a cover disposed over an opening in the access panel skin and selectively transitionable between a closed position and an open position, the opening situated relative to the handle such that the handle is concealed when the cover is in a closed position and accessible via the opening when the cover is in an open position.