Tunnel Concept Risk Allocation Methodology for Aircraft Navigation Systems

Robert J. Kelly

Abstract:	A generic aircraft/navigation risk methodology is described which is applicable to all navigation sensors and to all phases of flight-akeoff, climb, cruise, descent, approach, and landing. Each phase of flight can be viewed as a sequence of windows. These windows form a tunnel-in-space whose dimensions are determined from a top-down risk allocation which in turn defines the Required Navigation Performance (RNP). Using the RNP defined accuracy, integrity, and continuity-of- service, specific generic system requirements are derived. These requirements are the flight technical error (PTE), navigation sensor errors, monitor alarm limits, and equipment redundancy. This methodology was adopted by an All Weather Operations Panel (AWOP) working group of the International Civil Aeronautics Organization (ICAO) [18,23]. Using this risk allocation methodology the working group pro-posed generic integrity and continuity-of-service requirements for non-aircraft navigation system elements used in precision RNAV final approach and landings.
Published in:	Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992) June 29 - 1, 1992 ANA Westin Hotel Dayton, OH
Pages:	359 - 372
Cite this article:	Kelly, Robert J., "Tunnel Concept Risk Allocation Methodology for Aircraft Navigation Systems," Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992), Dayton, OH, June 1992, pp. 359-372.
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