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Four-Post Plan to Be Implemented by FAA

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Four Post Plan

On April 2, 1990, the FAA announced it would implement the 'Four-Post Plan,' a set of air traffic control procedural changes at Seattle-Tacoma International Airport designed to reduce congestion, improve efficiency, and address worsening arrival delays. The plan, developed after nearly a year of public meetings, environmental review, and computer simulation of 13 alternatives, was determined to produce no significant noise impact on surrounding communities. The FAA cited a 30,000 increase in annual landings and takeoffs since 1988 and the failure of mediation talks to produce an agreed-upon flight path solution as key reasons for moving forward with the changes.

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FAA press release (Release No. 90-16, April 2, 1990) announcing implementation of the Four-Post Plan air traffic control procedural changes at Sea-Tac Airport, effective April 3, 1990. Temple Johnson, Air Traffic Manager for FAA’s Northwest Mountain Region, states the plan was designed to relieve congestion over Puget Sound and improve National Airspace System efficiency. FAA studied 13 computer-simulated alternatives, conducted an environmental assessment with public comment period and public hearing, and issued a Finding of No Significant Impact (FONSI). Sea-Tac operations increased by 30,000 annual landings and takeoffs since November 1988 noise mediation began. Port of Seattle Noise Mediation Committee process formally ended; existing 1972 procedures cited as outgrown. Contact: Richard S. Meyer, (206) 431-2005.

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