Aircraft Thrust Dissymmetry Detection During Landing
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Solution Overview
Problem
Current aircraft landing monitoring systems fail to detect and alert pilots to a critical case of thrust dissymmetry in control levers, which can lead to runway deviations due to inappropriate lever handling after wheels touch the ground.
Innovation Solution
A method and device that detect thrust dissymmetry by determining an intermediary position threshold between idling and maximum speed positions, checking landing conditions, and triggering a warning when a control lever is in the intermediary position while another is in the idling position, ensuring pilots are alerted to exceptional situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the monitoring system only checks for control levers in thrust inversion or take-off positions, then the system complexity is reduced, but the reliability of detecting all critical thrust dissymmetry cases is worsened
Solution Approach 1:
The patent introduces a new parameter - an intermediary position threshold between idling and take-off positions - to detect lever positions that were previously undetected. This parameter change enables the system to identify the second case of dissymmetry where one lever is in an intermediary position and another is in idling position, thereby improving detection reliability without significantly increasing system complexity.
2Reliability
If the monitoring system detects all cases of lever dissymmetry, then the reliability of safety monitoring is improved, but the device complexity increases
Solution Approach 1:
The patent segments the lever position detection into distinct cases: the first case (one lever in thrust inversion position, another ahead of idling) and the second case (one lever in intermediary position between idling and take-off, another in idling position). By segmenting the detection logic into specific position thresholds and conditions, the system achieves comprehensive monitoring while maintaining manageable complexity through structured detection rules.
3Loss of information
If the warning system provides comprehensive information about lever positions, then the loss of information is reduced, but the ease of operation for pilots is worsened due to information overload
Solution Approach 1:
The patent extracts and highlights only the critical information needed for safe operation - specifically, the detection and warning of the two critical dissymmetry cases that can cause runway deviations. By extracting only the essential safety-critical information rather than providing all possible lever position data, the system reduces information overload while preventing loss of critical safety information.
Data Source
AI summary
A method and a device for detecting a thrust dissymmetry of an aircraft during a landing are disclosed. The detection device (6) comprises means (7) for detecting, upon a landing, that at least one of the engine control levers occupies an intermediary position comprised between a position threshold and a maximum speed position, as well as at least another engine control lever occupies an idling position, and means (9, 13) for triggering a warning when a landing condition is validated and at least one of the control levers occupies said intermediary position, at least another control lever occupying said idling position.