Multi-Transponder Aircraft Visibility Control
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Solution Overview
Problem
Commercial aircraft can become invisible to air traffic control if their transponders are intentionally or unintentionally turned off, leading to safety risks and loss of aircraft, as exemplified by the disappearance of Malaysia Airlines Flight 370, where a single transponder being turned off resulted in 239 deaths and the aircraft remaining lost.
Innovation Solution
Implementing a system with three or two transponders, where at least one is always active when airborne, using a touchdown-relay connected to the landing gear's squat-switch to ensure continuous communication with air traffic control, preventing transponders from being turned off while the aircraft is in the air, and allowing them to be turned off when on the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transponder is installed and can be manually turned off, then the aircraft can be controlled for privacy or operational reasons, but the aircraft can become invisible to air traffic control leading to loss of aircraft
Solution Approach 1:
The transponder system is divided into multiple independent transponders (at least two, preferably three) where each can operate independently. This segmentation ensures that if one transponder is turned off or malfunctions, others remain active to maintain aircraft visibility to air traffic control, thus resolving the contradiction between control flexibility and reliability.
Solution Approach 2:
The system is designed with redundant transponders as a preventive measure before any failure or intentional shutdown occurs. This prior cushioning ensures that aircraft visibility is maintained even if one transponder is turned off, addressing the reliability concern while preserving operational flexibility.
2Reliability
If transponders are required to always remain on for safety, then aircraft visibility is maintained, but the ability to turn off transponders for operational reasons is lost
Solution Approach 1:
By dividing the transponder system into multiple independent units, the patent allows individual transponders to be turned off for operational reasons while ensuring that at least one remains active for safety. This segmentation resolves the contradiction by providing both continuous visibility and operational flexibility.
Solution Approach 2:
Different transponders can have different operational states simultaneously - some can be turned off for local operational needs while others remain on for overall safety and visibility. This local quality approach allows selective control while maintaining system-wide reliability.
3Reliability
If multiple transponders are installed to prevent invisibility, then aircraft visibility is maintained, but the system complexity and cost increase
Solution Approach 1:
The patent implements a segmented transponder system with multiple independent units, each functioning as a complete standalone transponder. This segmentation provides redundancy and maintains visibility while keeping each individual unit relatively simple, balancing reliability improvements against system complexity.
Solution Approach 2:
The system changes the parameter of transponder quantity from one to multiple, fundamentally altering the reliability characteristic. This parameter change achieves the goal of maintaining aircraft visibility while the complexity increase is managed through standardized, modular transponder designs.
4Ease of operation
If transponders can be manually controlled, then operational flexibility is maintained, but intentional shutdown can lead to aircraft becoming lost
Solution Approach 1:
The transponder system is segmented into multiple independent units, allowing manual control of individual transponders while ensuring that shutdown of one does not result in complete invisibility. This segmentation maintains ease of operation for legitimate purposes while preventing the harmful outcome of aircraft loss.
Solution Approach 2:
The redundant transponder configuration provides beforehand cushioning against intentional or accidental shutdown. Even if one transponder is turned off for operational reasons, the remaining transponders ensure continued visibility, thus preventing the harmful effect of aircraft becoming lost while preserving operational flexibility.
Data Source
AI summary
A system and method for controlling multiple transponders in an aircraft to prevent the aircraft from becoming invisible to air traffic control. If a first transponder is turned off when the aircraft is airborne, a second transponder will automatically switch on. In some implementations, if the second transponder is turned off, a third transponder will automatically switch on. In one implementation, the third transponder cannot be turned off while the touchdown-relay confirms the aircraft is in the air. When the aircraft has landed, whichever one of the three transponders is on may be turned off. In some implementations the multiple transponders are arranged in a circular daisy chain.