Aircraft Service Access Locking for Flush Low-Gap Outer Surfaces
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Solution Overview
Problem
Current access panels in aircraft require high tolerance measures that compromise aerodynamics, increase production and maintenance costs, and disrupt stealth capabilities, with existing locking systems having potential for improvement in terms of gaps and spaces.
Innovation Solution
A locking apparatus with a base structure, covering device, and actuating shaft that allows for flush surfaces and precise adjustment, minimizing steps and spaces, and includes a spring device and stop means for secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If access panels are provided with a door and special landing zone with high tolerance requirements, then the aerodynamic surface finish is maintained, but the production cost, maintenance cost, and overall weight increase
Solution Approach 1:
The locking apparatus is divided into separate modular components: a base structure with through opening, a covering device, a spring device, and a stop means. These can be manufactured independently and assembled, reducing overall production complexity and cost while maintaining precision requirements for each individual component.
Solution Approach 2:
The actuating shaft with handling end region is surrounded by the covering device, creating a nested arrangement where the tool access feature is integrated within the covering structure. This eliminates the need for separate tool ports or additional openings, maintaining surface integrity while providing functionality.
2Manufacturing precision
If access panels are provided with a door and special landing zone with high tolerance requirements, then the aerodynamic surface finish is maintained, but the overall weight of the aircraft structure increases
Solution Approach 1:
By segmenting the locking apparatus into separate components that can be manufactured using standard tolerances and assembled, the patent eliminates the need for heavy monolithic structures with high-precision machining throughout. Each component can be optimized for its specific function with appropriate material selection and manufacturing methods.
Solution Approach 2:
The covering device is designed to be movable along the longitudinal axis within the through opening, transitioning between closed and open positions. This dynamic capability allows the locking apparatus to provide secure closure without requiring a permanently open access door, maintaining aerodynamic surface integrity while providing service access when needed.
3Ease of operation
If locks are provided for access panels to be accessible by tool from outside, then servicing is enabled, but the stealth capabilities are compromised due to surface disruption
Solution Approach 1:
The handling end region of the actuating shaft is nested within the covering device, allowing tool access through the covering structure itself rather than requiring separate external ports or protrusions. The tool can engage the handling end region through the opening in the covering device, maintaining a flush outer surface that does not disrupt stealth capabilities.
Solution Approach 2:
The covering device acts as an intermediary structure that provides both aerodynamic surface finish and tool access functionality. The opening in the covering device serves as the interface for tool engagement with the actuating shaft, eliminating the need for separate access ports that would disrupt the surface.
4Ease of operation
If locking systems are provided with gaps and spaces around access panels, then tool access is enabled, but the aerodynamic performance is limited
Solution Approach 1:
The handling end region is extracted as a separate functional element of the actuating shaft that can be engaged by tools through the opening in the covering device. This extraction allows tool access without requiring gaps or spaces in the surrounding structure, as the tool engages through the controlled opening rather than around the locking apparatus.
Solution Approach 2:
The handling end region is nested within the covering device structure, allowing the tool to access and operate the locking mechanism through the opening in the covering device without creating external gaps or spaces. The nested arrangement maintains a flush outer surface while providing internal access to the actuating shaft.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances precision in production, reduces weight, and maintains stealth capabilities by minimizing gaps and steps, while allowing easy access and secure locking.
Implementation Method 1
The covering device is preloaded by a spring device and is held in a closure position by a stop means in interaction with the spring device
Data Source
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AI summary
The present invention provides a locking apparatus for a service access in an external structure of an aircraft. In addition, the invention provides a service access having a locking apparatus of this kind, and an aircraft having a service access of this kind. The present invention furthermore provides a method for producing a locking apparatus for a service access in an external structure of an aircraft.