Aircraft Spoiler Movement Limiter for Power-Linked Maintenance
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Solution Overview
Problem
Existing aircraft spoiler systems lack effective safety mechanisms to prevent unintentional deployment and ensure safe maintenance operations, particularly in the event of actuation system failures.
Innovation Solution
An aircraft spoiler system with a movement limiting portion that includes a mechanical actuator, which when engaged, prevents the spoiler from moving to the deployed position and is disengaged only when the external power supply is disconnected, ensuring safe maintenance by linking power supply connection to movement limiting portion disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movement limiting portion is provided to prevent unintentional spoiler deployment, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the movement limiting portion with the power supply connector and mechanical actuator into an integrated safety mechanism. The movement limiter is arranged such that it can only be disengaged when the power supply connector is disconnected, merging the functions of power management and movement limitation into a single coordinated system rather than separate independent components.
Solution Approach 2:
The mechanical actuator serves multiple functions: it controls the movement limiting portion to prevent spoiler deployment and simultaneously blocks the power supply connector to prevent power connection. This multi-functional design allows a single component to perform both safety-related tasks, reducing the need for additional separate mechanisms.
2Ease of operation
If the movement limiting portion is disengaged for maintenance, then ease of operation is improved, but safety is worsened
Solution Approach 1:
The system requires that the power supply connector be disconnected before the movement limiting portion can be disengaged for maintenance. This preliminary action ensures that the system is in a safe state (no power connected) before allowing maintenance operations to proceed, preventing accidental activation during maintenance while still permitting necessary access.
Solution Approach 2:
The mechanical actuator provides tactile feedback and physical blocking to indicate and enforce the proper sequence of operations. When the power supply connector is connected, the actuator physically blocks disengagement of the movement limiter, providing clear feedback that the system is not in a safe state for maintenance. Only after power disconnection does the blocking disappear, allowing maintenance access.
3Reliability
If the mechanical actuator obstructs the power supply connector, then safety is improved, but device complexity increases
Solution Approach 1:
The blocking function for the power supply connector is merged into the movement limiting portion's mechanical actuator rather than being a separate component. The same actuator that controls spoiler movement limitation also physically blocks the power connector, combining two safety functions into one mechanism.
Solution Approach 2:
The mechanical actuator is designed as a multi-functional component that simultaneously performs movement limitation and power connection blocking. This universal component approach reduces the total number of parts needed compared to having separate mechanisms for each function.
Data Source
AI summary
An aircraft spoiler system includes a spoiler, a motor arranged to drive movement of the spoiler between a retracted and a deployed position, a power supply connector for connection to an external power supply, and a movement limiting portion. The movement limiting portion is selectively engageable. It is arranged, when engaged, to enable movement of the spoiler towards the retracted position and to prevent movement towards the deployed position. The movement limiting portion comprises a mechanical actuator actuatable to move between a first position and a second position. Actuation of the mechanical actuator to the second position disengages the movement limiting portion. In the second position, the mechanical actuator obstructs the power supply connector such that the mechanical actuator cannot be actuated to the second position.