Aircraft Landing Gear Oxygen Contamination Detection
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Solution Overview
Problem
The introduction of oxygen into aircraft landing gear struts during maintenance, when compressed air is used in place of nitrogen, leads to internal corrosion and potential combustion, limiting the Calendar Life of the landing gear and necessitating conservative life cycle limitations by manufacturers.
Innovation Solution
An apparatus with an oxygen sensor and processor is mounted on the landing gear strut to monitor and measure oxygen levels, allowing for detection of oxygen contamination and purging, thereby reducing corrosion and extending the Calendar Life limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If compressed air is used to service landing gear struts instead of nitrogen gas, then maintenance cost and availability are improved, but oxygen contamination occurs leading to internal corrosion and reduced reliability
Solution Approach 1:
The patent implements an oxygen sensing system that continuously monitors the internal atmosphere of landing gear struts and provides feedback to maintenance personnel. When oxygen contamination is detected above threshold levels, the system generates alerts that trigger corrective actions such as purging and recharging with nitrogen, thereby closing the control loop and preventing corrosion damage while allowing flexible servicing practices.
Solution Approach 2:
The patent introduces an oxygen sensor as an intermediary monitoring device between the strut interior and the external environment. This sensor acts as a mediator that detects oxygen contamination without interfering with the strut's primary functions, enabling indirect monitoring of internal conditions and facilitating timely intervention before corrosion occurs.
2Reliability
If nitrogen gas is strictly required for landing gear servicing, then corrosion prevention is improved, but maintenance flexibility and availability deteriorate
Solution Approach 1:
The patent transforms the servicing approach by changing the monitoring parameter from visual inspection of chrome exposure to chemical composition analysis via oxygen sensing. This parameter change enables acceptance of compressed air servicing (which would otherwise be prohibited) provided that oxygen levels remain below corrosion-threshold values, thereby expanding servicing flexibility while maintaining corrosion protection through quantitative control.
Solution Approach 2:
The oxygen sensing system provides real-time feedback on the chemical composition of the strut interior, enabling dynamic adjustment of servicing practices. Maintenance personnel can use compressed air when oxygen levels are low and be alerted to purge and recharge when levels rise, creating a flexible yet controlled servicing regime that adapts to actual conditions rather than imposing rigid restrictions.
3Reliability
If conservative calendar life limitations are imposed on landing gear, then safety margin is improved, but operational productivity and asset utilization deteriorate
Solution Approach 1:
The oxygen monitoring system provides continuous feedback on the actual internal condition of each strut, enabling condition-based management rather than blanket calendar life restrictions. Struts that maintain low oxygen levels can operate beyond conservative time-based limits, while those showing contamination are identified for early intervention, allowing productivity optimization based on real condition data while maintaining safety through active monitoring.
Solution Approach 2:
The system performs preliminary detection of oxygen contamination before it reaches levels that cause significant corrosion damage. By detecting and alerting on oxygen presence early in the contamination process, the system enables preventive purging and recharging actions that extend strut service life beyond conservative estimates, thereby increasing asset utilization while maintaining safety margins through proactive maintenance.
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 system effectively reduces internal corrosion and the risk of combustion, enabling landing gear manufacturers to increase the Calendar Life limitation and reduce maintenance costs by promptly identifying and correcting oxygen contamination.
Implementation Method 1
An oxygen sensor and processor are mounted to the landing gear strut and exposed to the interior gas of the landing gear strut.
Implementation Method 2
The processor is connected to the oxygen sensor and records information from the oxygen sensor.
Data Source
AI summary
A system for use in monitoring, measuring, recording, computing and transmitting the oxygen levels and identification of oxygen contamination within an aircraft telescopic landing gear strut. An oxygen sensor is mounted in relation to each of the landing gear struts as to monitor, recognize, measure and record the identification of oxygen within the telescopic landing gear struts. The amount of oxygen within each landing gear strut is measured and recorded and downloaded to the responsible aircraft maintenance department. By detecting the amount of oxygen in a strut, steps can be taken to purge the gas from the strut to minimize corrosion of strut components and to prevent internal combustion of the gas and oil in the strut.