Accession Number:



Microwave Landing Systems: Additional Systems Should Not Be Procured Unless Benefits Proven

Descriptive Note:

Technical Report

Corporate Author:

United States General Accounting Office Washington

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Important parts of our national airspace system NAS are the precision landing systems which allow aircraft equipped with the necessary electronic hardware avionics to land in conditions of limited visibility, thereby increasing the time an airport can operate during poor weather. The current precision landing system, the instrument landing system US, is scheduled to be replaced with the microwave landing systemMLS as part of the Federal Aviation Administrations FAA ambitious effort to modernize the nations air traffic control system-known as the MS plan. The Chairman, Subcommittee on Transportation, House Committee on Appropriations, asked GAO to review FAAS implementation of the NAS plan. As part of this effort, GAO reviewed the MIS program, addressing the following objectives assess the justification and requirements for a new precision landing system to replace IIS and determine and analyze IZS improvements since MIS was justified, determine whether FAA has adequately demonstrated MIS potential operational and economic benefits, and determine the reasonableness of FAAS MW siting strategy.

Subject Categories:

  • Air Navigation and Guidance

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