EGPWS Alert Suppression Using Cruise and Take-Off Altitude Logic
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Solution Overview
Problem
Aircraft equipped with Enhanced Ground Proximity Warning Systems (EGPWS) generate unnecessary alerts during take-off when descending from altitudes higher than the cruise altitude, which can be distracting and undesirable for pilots.
Innovation Solution
An avionic system that utilizes cruise and take-off altitude data sources to determine if the cruise altitude is below the take-off altitude, preventing the EGPWS alert mode from generating alerts until the aircraft reaches the cruise altitude, thereby disabling or commanding the alert to be suppressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGPWS generates alerts during any descent after take-off, then terrain collision risk is reduced, but unnecessary alerts are generated when descending from high-altitude take-off locations, causing pilot distraction
Solution Approach 1:
The system changes the operational parameters of the EGPWS alert mode by introducing altitude comparison logic. It retrieves cruise altitude from flight management data and take-off altitude from navigation data, then compares these parameters to determine whether to suppress alerts. This parameter-based decision-making allows the system to maintain high reliability by preserving alert functionality while eliminating unnecessary distractions during high-altitude take-off scenarios
Solution Approach 2:
The system introduces an intermediary decision-making process between the descent detection and alert generation. The EGPWS alert mode acts as an intermediary that receives descent information, compares it against stored altitude data, and then decides whether to generate alerts. This intermediary layer filters out unnecessary alerts while preserving critical warnings, resolving the contradiction between reliability and pilot distraction
2Reliability
If the EGPWS alert mode is always active after take-off, then safety monitoring is maintained, but operational efficiency decreases due to unnecessary alerts during high-altitude take-off descents
Solution Approach 1:
The system implements dynamic alert suppression based on real-time altitude conditions. Rather than maintaining a static alert state, the EGPWS alert mode dynamically adjusts its behavior by continuously comparing current altitude against stored take-off and cruise altitude data. This dynamic approach maintains safety monitoring continuity while improving operational efficiency by suppressing alerts only when conditions indicate they are unnecessary
3Object-affected harmful factors
If the system suppresses EGPWS alerts during high-altitude take-off descents, then pilot distraction is reduced, but alert reliability may be compromised if actual terrain conflicts occur
Solution Approach 1:
The system applies local quality suppression by targeting specific alert conditions rather than globally disabling alerts. It suppresses alerts only in the local context of high-altitude take-off descents where the descent is toward the intended cruise altitude. Alerts remain fully reliable in all other contexts, maintaining terrain conflict detection capability while reducing distraction in the specific scenario where suppression is applied
Data Source
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AI summary
A system and method for selectively preventing an alert mode implemented in an enhanced ground proximity warning system (EGPWS) from generating an alert includes retrieving from a cruise altitude data source, using the EGPWS, cruise altitude data that is indicative of a cruise altitude of an aircraft, and retrieving from a take-off altitude data source, using the EGPWS, take-off altitude data this is indicative of a take-off altitude of the aircraft. The cruise altitude data and the take-off altitude data are processed in the EGPWS to determine if the cruise altitude is below the altitude from which the aircraft is taking off. When the cruise altitude is below the altitude from which the aircraft is taking off, the alert mode implemented in the EGPWS is prevented from generating the alert until the aircraft is at the cruise altitude.