Microwave Landing System Ground and Flight Inspection Alignment Procedures

Alfred R. Lopez

Abstract:	Over the past years several Micrmr1ave Landing Systems (MLS) have been installed, ground checked, flight inspected and commissioned. Some of the experience gained during these installations is reviewed. Fundamental differences exist between ILS and MLS which impact ground and flight inspection procedures. The ILS glideslope antenna incorporates the ground to form the glidepath; the MLS elevation antenna is essentially insensitive to the ground reflection. The ILS localizer antenna requires control of the ground reflecting surface; the MLS azimuth antenna utilizes a sharp bottom-side cutoff radiation pattern which substantially reduces the sensitivity to the ground reflection. It is believed that the MLS insensitivity to ground reflection will ultimately allow simpler inspection procedures which attach more reliance on less expensive ground inspection procedures as opposed to flight inspection procedures.
Published in:	Proceedings of the 1988 National Technical Meeting of The Institute of Navigation January 26 - 29, 1988 Santa Barbara, CA
Pages:	269 - 273
Cite this article:	Lopez, Alfred R., "Microwave Landing System Ground and Flight Inspection Alignment Procedures," Proceedings of the 1988 National Technical Meeting of The Institute of Navigation, Santa Barbara, CA, January 1988, pp. 269-273.
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