ANALYSES SUPPORTING FAA DECISIONS MADE DURING THE DEVELOPMENT OF SUPPLEMENTAL GPS AVIONICS REQUIREMENTS

James JP Fernow and Young C. Lee

Peer Reviewed

Abstract:	Durmg 1992, members of the FAA Navigation Satellite Operational Implementation Team (SOIT) developed the requirements for Technical Standard Order (TSO) C-129, which describes capabilities of GPS avionics to be used as a supplemental means of navigation for en route through nonprecision approach phases of flight. During the writing of TSO C-129, the SOIT requested that analyses of certain. issues be performed, including the effect of certain types of altimeter aiding on receiver autonomous integrity monitoring (RAIM) availability, and the risk of continuing flight in the event of an unpredicted loss of RAIM after an aircraft crosses the final approach fix (FAF) of a nonprecision approach. This paper summarizes technical analyses used in the development of these requirements. The results showed that altimeter aiding significantly improved RAIM availability, and that the risk of continuing an approach in case of an unpredicted loss of RAIM under certain conditions was acceptable. Operational and technical considerations, including the results of these analyses, led the SOIT to require certain capabilities of GPS avionics to be covered under TSO C-129.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 41, Number 4
Pages:	463 - 478
Cite this article:	Fernow, James JP, Lee, Young C., "ANALYSES SUPPORTING FAA DECISIONS MADE DURING THE DEVELOPMENT OF SUPPLEMENTAL GPS AVIONICS REQUIREMENTS", NAVIGATION: Journal of The Institute of Navigation, Vol. 41, No. 4, Winter 1994-1995, pp. 463-478.
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