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At the request of the Microwave Landing System (MLS) Program Office, the Federal Aviation Administration (FAA) Technical Center conducted an operational demonstration and flight test of the MLS at Miami/Tamiami, Florida Airport. The demonstration/flight test was conducted in conjunction with an MLS seminar jointly sponsored by U.S. Department of Transportation, FAA, and Transport Canada Aviation Group. The Technical Center's MLS test bed, consisting of 1.5 beamwidth elevation station and a 2 beamwidth azimuth station, was transported to, and temporarily installed at the Miami/Tamiami Airport on runway 9R, collocated with the commissioned instrument landing system (ILS). Additionally, an E-Systems preproduction model precision distance measuring equipment (DME/P) transponder was also installed adjacent to the runway 9R localizer equipment shelter. On March 29, 1989, seven 1-hour demonstration and data collection flights were flown for over 60 aviation, industry, and US and international Government attendees. By careful siting of the MLS on runway 9R, proportional MLS signal coverage was also obtained in the approach regions of runways 9L and 13. By utilizing an FAA Technical Center designed and fabricated MLS area navigation (RNAV) computer on board the demonstration aircraft, precision approaches were flown not only to runway 9R, but also to runways 9L and 13. This demonstrated the tremendous flexibility and operational capability of MLS. The MLS signal-in-space on runway 9R met Category II ILS tolerances. No degradation of the ILS performance due to the MLS collocation was detected during this demonstration.
The Federal Aviation Administration's (FAA's) microwave landing system (MLS), which is designed to replace existing instrument and other landing systems, is to be an all-weather precision guidance system making instrument landings possible at more locations and providing flexibility in approach paths. It is expected to be easier to install and maintain and less expensive than the current system. A high level of uncertainty exists in the Department of Transporation and the aviation community concerning the overall expected benefits of the MLS. It is generally believed that instrument landing systems are reliable, safe, and provide efficient service within technical and operational capabilities. However, the current system is limited to 40 channel frequencies; it does not meet military tactical requirements; and it is adversely affected by heavy snow, irregularities in the terrain, and structures built close to the runway. The MLS is expected to overcome these limitations. The total research and development effort for the MLS program will be between $90 million to $100 million more than originally estimated. No urgent need exists for the military MLS systems; therefore, to plan for production deliveries of both civil and military systems in 1985 and an initial operating capability in 1986 appears unnecessary.
This document specifies requirements for both an airborne Microwave Landing System (MLS) receiver and an MLS area navigation (MLS/RNAV) system. This equipment shall derive aircraft position and guidance for flight along precision three-dimensional paths within the MLS coverage.