TAWS Alert Suppression via Landing Zone Parsing
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Solution Overview
Problem
Terrain awareness systems (TAWS) often generate false alerts during landing operations due to unrecognized landing zones, which can lead to unnecessary alert suppression and potential Controlled Flight Into Terrain (CFIT) accidents, especially in Vertical Take-Off and Landing (VTOL) aircraft that land at non-airport locations.
Innovation Solution
A TAWS system that allows users to enter flight plan information, including waypoints and landing zones, to suppress potential-terrain-collision alerts by parsing landing zone identifiers and communicating with a flight management computer to determine if a landing zone is recognized, thereby reducing false alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TAWS uses a database of recognized landing zones to generate terrain alerts, then genuine terrain collision warnings are improved, but false alerts increase during landing at unrecognized zones
Solution Approach 1:
The system performs preliminary identification of landing zones by parsing waypoint identifiers before the landing operation. When a waypoint matches a known landing zone identifier pattern, the system pre-determines that terrain alerts should be suppressed during the approach and landing phase, preventing false alerts before they occur.
Solution Approach 2:
The system applies different alert suppression rules to different geographical locations. By identifying specific landing zones through waypoint parsing, the system enables alert suppression only at recognized landing zones while maintaining alert functionality at all other locations, creating localized quality differentiation in system behavior.
2Object-generated harmful factors
If TAWS suppresses alerts during landing operations, then false alerts are reduced, but genuine terrain warnings may be inadvertently suppressed
Solution Approach 1:
The system performs preliminary verification by checking whether the current waypoint identifier matches a recognized landing zone pattern before enabling alert suppression. This preliminary action ensures that suppression is only activated at validated landing zones, preventing inadvertent suppression of genuine warnings at unrecognized locations.
Solution Approach 2:
The system continuously monitors the aircraft's position and waypoint information, providing feedback to determine whether alert suppression should be active. By parsing landing zone identifiers from flight plan data and comparing against known patterns, the system dynamically adjusts alert suppression based on real-time location feedback.
3Object-generated harmful factors
If TAWS requires crew intervention to deactivate alerts, then false alerts can be suppressed, but workload increases during critical phases
Solution Approach 1:
The system automatically performs alert suppression without requiring crew intervention. By parsing landing zone identifiers from the flight plan data and autonomously determining when suppression should be applied, the system serves itself to eliminate false alerts, freeing the crew from manual alert management tasks during critical phases.
Solution Approach 2:
The system pre-configures alert suppression parameters by parsing landing zone information from the flight plan before the landing operation begins. This preliminary configuration allows the system to automatically activate suppression at the appropriate time without requiring crew actions during the critical approach and landing phases.
Data Source
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AI summary
An aircraft terrain awareness warning system is disclosed that includes an interface for entering flight plan details of an aircraft including at least one waypoint. The terrain awareness warning system is configured such that potential-terrain-collision alerts are suppressed in the aircraft during landing operations performed at waypoints associated with landing zones.