Evacuation Slide Secondary Release for Restraint Decoupling Failure
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Solution Overview
Problem
Emergency evacuation slides in aircraft often face issues where restraints fail to de-couple automatically in response to internal slide pressure, hindering deployment during emergencies.
Innovation Solution
A secondary release arrangement featuring a flexible member, such as a cable, connected to a handle that manually releases restraints by applying tension, ensuring deployment even if automatic release fails, comprising a flexible member with one end coupled to a handle and the other to a releasable restraint, allowing staged deployment and full deployment of the slide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If automatic release mechanism is used, then deployment speed is improved, but reliability deteriorates due to potential failure of automatic release
Solution Approach 1:
The patent implements a secondary release arrangement that acts as a backup mechanism. This arrangement includes a flexible member connected to a handle that can manually release the restraint if the automatic pressure-based release fails. The secondary mechanism is prepared in advance to compensate for potential automatic release failures, thereby maintaining high reliability while preserving rapid deployment capability.
Solution Approach 2:
The flexible member serves as an intermediary mechanism between the operator and the restraint system. When the automatic release mechanism fails, the operator can pull the handle to tension the flexible member, which then directly actuates the restraint release. This intermediary provides a reliable fallback path that does not depend on the automatic pressure-sensitive mechanism.
2Reliability
If secondary release arrangement is added, then reliability is improved, but device complexity increases
Solution Approach 1:
The release system is segmented into two independent functional components: the primary automatic pressure-based release mechanism and the secondary manual release arrangement. Each component can operate independently to release the restraint. This segmentation allows the secondary mechanism to be added without fundamentally redesigning the primary system, thereby limiting the increase in overall complexity while improving reliability.
Solution Approach 2:
The secondary release arrangement is extracted as a separate, minimal-addition component rather than being integrated into the core automatic mechanism. It consists of discrete elements (handle, flexible member, connection points) that can be added to the existing restraint system without complicating the automatic pressure-release logic. This extraction approach minimizes the complexity burden of the reliability enhancement.
3Ease of operation
If manual release mechanism is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The manual release mechanism is designed to be self-explanatory and self-operating. The handle provides direct mechanical advantage through the flexible member to release the restraint, requiring minimal operator training or complex control procedures. The system serves itself by providing an intuitive mechanical fallback that does not require external assistance or complex sequencing, thereby maximizing ease of operation with minimal complexity addition.
Data Source
Figure 1~2
Figure 3
Figure 4A~5
AI summary
A secondary release arrangement (300) for a releasable restraint may comprise a flexible member (310) in operable communication with a strap attached to the releasable restraint (302) configured to release the strap from the releasable restraint (302) in response to a tensile force in the flexible member (310) exceeding a selected threshold. In various embodiments, the secondary release arrangement (300) may be configured to allow deployment of an evacuation system (104) in the event of the releasable restraint (302) failing to release.