Aircraft Guidance Passivation via Triplex Comparison
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Solution Overview
Problem
Current aircraft systems fail to guarantee the required navigation performance (RNP AR) due to inability to automatically detect and mitigate erroneous guidance orders, necessitating special crew training and authorization for stringent navigation procedures.
Innovation Solution
A method and device implementing a triplex architecture that compares guidance orders from multiple sources to automatically select and transmit a valid, passivated guidance order, isolating defective sources and ensuring immediate, transparent counteraction of erroneous orders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple calculation stages are used to generate guidance orders, then navigation reliability is improved, but system complexity increases
Solution Approach 1:
The guidance system is divided into multiple independent calculation stages (at least three stages), each capable of independently generating guidance orders. This segmentation allows the system to compare results from different stages and identify erroneous orders, thereby improving navigation reliability while managing system complexity through modular design.
2Reliability
If automatic detection and mitigation of erroneous guidance orders is implemented, then safety level is improved, but device complexity increases
Solution Approach 1:
The system implements automatic feedback mechanisms where guidance orders from multiple calculation stages are continuously compared. When an erroneous order is detected through this comparison process, the system automatically mitigates the error by selecting a valid order from the other stages, eliminating the need for special crew training and authorization while maintaining high safety levels.
3Measurement precision
If RNP AR procedures are implemented with stringent requirements, then navigation precision is improved, but operational complexity increases
Solution Approach 1:
The system performs preliminary comparison and validation of guidance orders from multiple calculation stages before executing RNP AR procedures. This preliminary action ensures that only valid, consistent guidance orders are used, allowing the system to meet stringent RNP AR requirements (RNP values ≤0.3 NM in approach, ≤1 NM at start and throttling up) without increasing operational complexity for the crew.
Data Source
AI summary
A device for verifying guidance orders includes a passivation device for implementing comparisons between guidance orders from at least three different equipments in order to generate a passivated guidance order. For example, one of the guidance orders may be an auxiliary guidance order used to compare to the other two primary guidance orders so that the primary guidance order that is closest to the auxiliary guidance order is selected as the passivated guidance order. The passivated (e.g., validated) guidance order is transmitted to a flight control system of the aircraft.