New Siting Techniques For The ILS Glide Slope

Richard H. McFarland

Abstract:	The most recent innovations relating to the contemporary instrument landing system glide slope are discussed in the context of need and consequently goals, for providing greater capability, availability, and quality. Capability refers to obtaining acceptable performance at sites which have previously been judged terribly difticult or impossible. Availability is crucial because history shows that the negative impact on flight safety comes from the absence of a glide slope, not the existence of a malfunctioning one or one that is operating poorly. Higher quality beam structures are desired because of more automatic flight operations using the glide slope. Three new type systems are discussed which represent significant achievement towards reaching these goals. All are endfue, non-image systems which use slotted cables for providing an array of radiating elements. The availability of these relieve many of the constraints which heretofore were so dominant that glide slopes simply could not be installed. In fact, with the endfire systems the capability exists now to provide a glide slope at any airport site where the physical obstruction criteria can be met for establishing a Category I ILS approach procedure.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	315 - 319
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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