Aircraft Nacelle Latch Detection Linkage for Reliable Status Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mechanical locking systems for aircraft nacelles lack a reliable mechanism to indicate the unlock status of individual latches, leading to potential faulty closures during maintenance, which can cause in-flight issues due to reliance on operator vigilance and the complexity of monitoring latch positions.
Innovation Solution
A locking device with a detection linkage that irreversibly drives the indicator to an unlocked position when a latch is opened, ensuring that all latches must be locked before the indicator returns to a locked position, using a bolt and hook mechanism with an elastic return system and a detection part that engages with the linkage to prevent premature unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical detection system is implemented to indicate latch status, then flight safety and reliability are improved, but device complexity increases
Solution Approach 1:
A detection linkage acts as an intermediary mechanical element that translates the position of each latch into a unified visual indication. The linkage connects all latch positions to a single indicator mechanism, allowing the system to monitor multiple latches without requiring complex electronic sensors or multiple separate indicators for each latch.
Solution Approach 2:
The mechanical detection system is self-actuating through the inherent movement of the latches themselves. As latches move between locked and unlocked positions, they automatically drive the detection linkage and indicator without requiring external power sources, sensors, or additional actuation mechanisms.
2Measurement precision
If individual latch status monitoring is implemented, then measurement precision of locking status is improved, but device complexity increases
Solution Approach 1:
The detection linkages from multiple individual latches are merged into a single unified indicator mechanism. The linkage system combines the positional information from all latches and presents it through one clear visual indicator, eliminating the need for multiple separate monitoring devices while maintaining precise detection of each latch's status.
Solution Approach 2:
The single visual indicator serves multiple functions: it indicates the status of each individual latch, shows overall system locking status, and provides a unified reference point for operators. The detection linkage system universally translates various latch positions into a common indicator language that can be easily interpreted.
3Reliability
If the indicator shows unlock status when any latch is opened, then reliability of status indication is improved, but ease of operation becomes more difficult
Solution Approach 1:
The visual indicator provides immediate feedback to operators about the unlocking status of latches. When any latch is opened, the indicator clearly shows the unlocked state, giving operators real-time information about which latches need attention. This feedback mechanism guides the unlocking operation by making the status of each latch immediately apparent.
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
This solution provides a clear and reliable visual indication of the locking status, preventing partial unlocking and ensuring all latches are securely locked before operation, enhancing flight safety by eliminating the need for operator-driven status changes during unlocking.
Implementation Method 1
at least one elastic return means which tends to return it in a position spaced apart from the retaining means
Data Source
AI summary
A locking device includes a locking pair having a bolt to engage with a retainer and a detection linkage. The bolt is movably mounted against a spring which tends to return the bolt to a position spaced apart from the retainer. The detection linkage is also movably mounted between an unlocked position where the detection linkage allows unlocking of the bolt and the retainer. In particular, a portion of the bolt then engages with the detection linkage by means of a detecting part of the detection linkage to block a possible return of the detection linkage towards a locked position where the detection linkage engages with the portion of the bolt so as to oppose to unlocking of the bolt. The detecting part irreversibly drives the detection linkage to its unlocked position even when one locking pair is unlocked.