Aircraft Cowling Door Overcentering Latch System
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Solution Overview
Problem
Existing opening systems for cowling access doors in aircraft lack an automatic latching feature to secure the door in the opened position, often require a two-hand operation, and are cumbersome, restricting maintenance access and being costly to manufacture.
Innovation Solution
An opening system featuring an overcentering latch that automatically secures the cowling access door in the open position, operated with a single hand, using a remote actuator and release system with a Bowden cable and thumb lever for ergonomic operation, reducing component count and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gas springs and/or hold open rods are used to secure the cowling access door in an opened position, then the door can be held open, but maintenance worker access is restricted and hindered
Solution Approach 1:
The patent removes the traditional gas spring or hold open rod components that obstruct maintenance access. Instead, it uses a latch mechanism integrated into the door structure itself, extracting the problematic elements while maintaining the door holding function through the latch's engagement with the door frame.
Solution Approach 2:
The latch mechanism is designed to automatically engage and hold the door in the open position without requiring external assistance or occupying valuable maintenance space. The system serves itself by using the door's own movement to trigger the latch engagement, eliminating the need for separate holding components.
2Reliability
If gas springs are used to secure the cowling access door, then the door can be held open, but the system requires maintenance due to aging gaskets
Solution Approach 1:
The patent eliminates the need for long-lasting but maintenance-prone gas springs with aging gaskets. The latch mechanism uses simpler, more durable components that do not require periodic maintenance, accepting that the latch itself may need replacement after its service life rather than requiring ongoing maintenance of sealing components.
Solution Approach 2:
The patent replaces the gas spring mechanical system with a purely mechanical latch and linkage system. This substitution eliminates the gasket aging problem inherent in gas springs while maintaining reliable door holding capability through the latch's positive mechanical engagement.
3Reliability
If hold open rods are used to secure the cowling access door, then the door can be held open, but a two-hands operation is required and a lot of space is needed for installation
Solution Approach 1:
The patent merges the door holding function with the door structure itself by integrating the latch mechanism into the door assembly. This consolidation eliminates the need for separate hold open rods and reduces the overall installation space requirement while maintaining reliable door holding capability.
Solution Approach 2:
The latch mechanism is segmented into discrete, modular components that can be independently installed and maintained. This segmentation allows for compact installation while maintaining the door holding function, reducing the space requirement compared to traditional hold open rods.
4Ease of operation
If folding struts are used to secure the cowling access door in an open position, then maintenance worker access is not restricted, but a two-hands operation is required
Solution Approach 1:
The latch mechanism is designed to automatically engage when the door is opened, eliminating the need for manual operation. The door's opening motion itself triggers the latch to engage with the door frame, providing automatic holding without requiring two-hands operation or complex manual procedures.
Solution Approach 2:
The latch mechanism dynamically engages and disengages based on the door's position and movement. As the door opens, the latch automatically moves into its engaged state, and can be released through a simple mechanism, providing dynamic adaptation to operational needs without requiring complex manual procedures.
Data Source
AI summary
An opening system for a cowling access door, to a cowling access door with such an opening system for a cowling of an aircraft, to an aircraft comprising such a cowling access door, and to a method of operating such an opening system. The opening system may include an overcentering latch that automatically latches in the over-centered state to prevent the cowling access door from returning to the closed position, and a release system that is coupled to the overcentering latch and adapted for transitioning the overcentering latch from the over-centered state to an unclamped state. The opening system further includes a remote actuator that is located spaced apart from the release system and adapted for remotely actuating the release system.