Aircraft Suite Sliding Door Magnetic Rail Failure Indicator
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Solution Overview
Problem
Traditional malfunction indicators for aircraft suite sliding doors are mechanical and prone to failure, requiring frequent maintenance, and do not automatically reset when the error condition is rectified.
Innovation Solution
A redundant rail system with a weighted malfunction indicator pivotally mounted to a stationary wall, featuring a first magnet on the indicator and a second magnet on the secondary rail, which automatically deploys to a visible position when the primary rail fails, and resets when the failure is rectified, using magnetic connection to maintain or break the indicator's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical malfunction indicators are used, then the flight crew can be alerted to rail failures, but the indicators are prone to part failure, require mechanical adjustment, and need frequent maintenance
Solution Approach 1:
The patent replaces traditional mechanical malfunction indicators with a magnetic field-based detection system. Magnets are positioned on the secondary rail carriage, and a magnetometer on the primary rail detects the magnetic field presence. This substitution eliminates mechanical contacts, moving parts, and mechanical adjustments in the indication system, thereby improving reliability and reducing maintenance requirements while still alerting the flight crew to rail failures.
2Reliability
If traditional mechanical malfunction indicators are used, then rail failures can be detected, but the indicators do not automatically reset when the error condition is rectified
Solution Approach 1:
The magnetic field-based detection system automatically resets when the error condition is rectified. When the secondary rail carriage returns to its proper position, the magnetometer automatically detects the restored magnetic field and clears the malfunction indication without requiring manual intervention. This self-resetting capability improves reliability by ensuring the system is always in the correct state while avoiding the complexity of additional reset mechanisms.
3Adaptability or versatility
If a redundant rail system is implemented, then the door can continue to operate in case of primary rail failure, but the system complexity increases
Solution Approach 1:
The patent introduces a magnetic field as an intermediary between the secondary rail carriage and the detection system. This magnetic field mediator enables automatic detection of the carriage position and failure conditions without requiring complex mechanical linkages, sensors, or electrical connections between the redundant components. The magnetic field-based approach maintains adaptability for continuous door operation while minimizing the added system complexity.
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
Provides an easily maintainable, automatic indication of rail failure, ensuring flight crew awareness without mechanical parts, and automatic reset when the issue is resolved, enhancing aviation safety.
Implementation Method 1
a magnetic connection is maintained between the first magnet and the second magnet such that the weighted malfunction indicator is maintained in a first position
Implementation Method 2
the first magnet is drawn to the second magnet to return the weighted malfunction indicator to the first position
Data Source
AI summary
A malfunction indicator assembly for a suite door slidable along a redundant rail system. The malfunction indicator assembly includes a weighted malfunction indicator pivotally mountable to a stationary wall and carrying a first magnet, and a second magnet mountable to one end of a secondary rail and carriage subassembly proximal to the weighted malfunction indicator. In use, in the absence of primary rail and carriage subassembly failure, a magnetic connection is maintained between the first and second magnets such that the indicator does not present outside of a vertical plane of the stationary wall, and in the presence of the primary rail and carriage failure the magnetic connection is broken to present the indicator outside of the vertical plane of the stationary wall. In embodiments, upper and lower malfunction indicators operate independently to report failures.