Aircraft Grounding Arm With Force-Verified Lightning Contact
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Solution Overview
Problem
Aircrafts parked at passenger loading bridges are at risk of lightning strikes, and existing grounding methods lack assurance of effective electrical grounding, which can delay turn-around times during adverse weather conditions.
Innovation Solution
A lightning grounding apparatus with a pivot arm, actuator, and limit switch system that physically contacts an aircraft's exterior surface to ensure electrical grounding, providing visual and audible notifications of sufficient contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional grounding methods are used, then the grounding process is simple, but the assurance of effective electrical grounding is insufficient
Solution Approach 1:
The patent employs a limit switch that provides feedback by tripping when a predetermined amount of force is detected during contact between the grounding element and aircraft surface. This feedback mechanism confirms effective grounding has been achieved, resolving the contradiction by providing reliability assurance through a relatively simple feedback loop rather than complex monitoring systems.
Solution Approach 2:
The grounding apparatus uses its own contact force to trigger the limit switch, making the system self-verifying. The act of grounding itself generates the signal that confirms grounding effectiveness, eliminating the need for separate verification equipment and maintaining simplicity while improving reliability.
2Productivity
If manual grounding verification is used, then the equipment is simple, but the turn-around time increases during adverse weather conditions
Solution Approach 1:
The system automatically verifies grounding effectiveness through the limit switch triggered by contact force, eliminating manual verification steps. This self-service approach reduces turn-around time by immediately confirming grounding status without requiring additional inspection time, directly addressing the productivity improvement goal.
Solution Approach 2:
The patent replaces manual visual inspection with an automated mechanical limit switch system that objectively detects grounding contact. This substitution eliminates subjective verification delays and provides immediate, unambiguous confirmation of grounding status, reducing time loss during critical turn-around operations.
3Reliability
If visual indicators are added to confirm grounding contact, then the reliability of grounding confirmation is improved, but the device complexity increases
Solution Approach 1:
The patent uses color-changing indicators (such as lights transitioning between colors) to communicate grounding status. This provides clear, reliable visual confirmation of effective grounding contact while maintaining relatively simple device architecture through the use of standard indicator components rather than complex notification systems.
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
The apparatus effectively mitigates lightning strike risks and reduces aircraft turn-around times by ensuring safe grounding conditions for passengers, enhancing operational safety and efficiency.
Implementation Method 1
a limit switch operating arm configured to trip the limit switch in response to a predetermined amount of force against the distal end of the pivot arm
Data Source
AI summary
A lightning grounding apparatus that includes a pivot arm and an electrical grounding element at the distal end of the pivot arm. An actuator is mechanically coupled to the pivot arm and configured to rotate the pivot arm about an axis so as to swing the distal end of the pivot arm between a retracted position and an extended position that is configured to make physical contact between the electrical grounding element and a surface of a structure to be grounded. A limit switch is provided that is mounted on the pivot arm, and is responsive to a position of a limit switch operating arm. The limit switch operating arm is configured to trip the limit switch in response to a predetermined amount of force against the distal end of the pivot arm resulting from physical contact being made between the electrical grounding element and the surface of the structure.