Tamper-Evident Indicator for Aircraft Stowage Containers
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Solution Overview
Problem
Current stowage containers for aircraft life vests require time-consuming and labor-intensive visual and manual inspections to detect breaches, and they necessitate regular replacement of tamper-evident closures, leading to inventory and cost issues.
Innovation Solution
A tamper-evident device with an indicator assembly that visually indicates whether the container has been breached, remaining in an accessible state for authorized personnel and visible from a wide field of view without the need for additional tools, eliminating the need for replacement closures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual and manual inspection methods are used to detect breaches, then inspection thoroughness is improved, but inspection time and labor intensity increase
Solution Approach 1:
The patent replaces manual visual inspection with an automated optical detection system. The indicator assembly uses optical elements (transparent/colored indicators, windows, and lighting) to automatically display breach status, eliminating the need for inspectors to manually examine each closure while providing clear visual indication of tampering.
Solution Approach 2:
The indicator assembly automatically detects and displays breach status without requiring manual inspection. The system self-monitors the closure integrity through the indicator mechanism, which changes state based on whether the closure has been compromised, allowing rapid automated verification.
2Reliability
If frangible closures are used to detect breaches, then breach detection capability is improved, but the need for replacement closures increases inventory requirements
Solution Approach 1:
The indicator assembly provides continuous breach detection capability without being consumable. Unlike frangible closures that must be replaced after use, the indicator mechanism remains in place and can detect multiple breach events, eliminating the need for inventory management of replacement closures while maintaining reliable detection.
Solution Approach 2:
The patent uses a visual indicator (colored indicator, window, or light) that replicates or represents the breach status rather than requiring physical replacement of the closure itself. The indicator provides a copy or representation of the security state, allowing detection without consumable materials.
3Reliability
If frangible closures are made easily breakable for detection, then breach identification is improved, but resistance to unauthorized removal decreases
Solution Approach 1:
The system separates the detection function from the closure function. The indicator assembly is divided into distinct components (indicator element, window, housing) that can change state to show breach status, while the closure itself maintains its full strength and security properties. This segmentation allows the closure to remain secure while providing reliable breach detection through the indicator mechanism.
Data Source
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AI summary
A method for detecting tampering with a stowage container can include configuring the stowage container, the stowage container comprising a container housing and a barrier, wherein edges of the barrier overlap edges of the container housing to prevent access to an interior of the stowage container between the container housing and the barrier when the barrier is in a closed position. A tamper-evident device can be positioned such that the tamper-evident device is viewable from at least one predetermined eyepoint under an ambient light environment. The tamper-evident device can be configured to be inaccessible from an exterior of the stowage container and provides a distinct color contrast with the stowage container and an indication that tampering has occurred. (Fig. 7)