Tailstrike Warning System Using Angle of Attack
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tailstrike warning systems based on pitch angle analysis are ineffective due to pilots' reliance on angle of attack for understanding flight conditions, particularly during takeoff and landing, leading to disorientation and increased risk of tailstrikes in transport planes with varying weights and pilot experience levels.
Innovation Solution
A tailstrike warning system that analyzes the angle of attack of an aircraft, determining proximity to a threshold by considering the rate of change and safety margins, providing audible and visual warnings through a modified flight director with a tailstrike proximity ceiling, which is more intuitive and actionable for pilots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pitch angle is used for tailstrike warning, then the warning system can detect potential tailstrikes, but the warning becomes disorienting and less effective for pilots
Solution Approach 1:
The patent changes the parameter used for tailstrike warning from pitch angle to angle of attack. This parameter substitution makes the warning more intuitive for pilots because angle of attack is a familiar and commonly monitored parameter during flight operations, particularly during takeoff and landing phases when tailstrikes are most likely to occur.
2Object-affected harmful factors
If a skid or wheel is added to the rear of the aircraft, then impact of tailstrike is reduced, but structural damage still occurs and device complexity increases
Solution Approach 1:
The system performs preliminary detection and warning before a tailstrike occurs. By monitoring angle of attack and providing advance warning to the pilot, the system enables preventive action rather than merely mitigating damage after the fact. This approach avoids adding physical protective structures like skids or wheels to the aircraft.
3Reliability
If pitch angle analysis is used for tailstrike warning, then the system can provide warning, but the warning is not intuitive during takeoff and landing when pilots process critical information
Solution Approach 1:
The patent substitutes pitch angle with angle of attack as the monitoring parameter. Angle of attack is directly relevant to flight path and aerodynamic performance, making it a more natural parameter for pilots to monitor during critical phases of flight. This change maintains detection capability while improving integration with pilot situational awareness.
Data Source
AI summary
An aircraft tailstrike warning method includes identifying a first value representing an aircraft angle of attack, identifying a second value representing a maximum aircraft angle of attack, identifying a difference between the first value and the second value, and providing a tailstrike warning when the difference between the first value and the second value is less than a threshold amount.