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Draft Environmental Assessment for Proposed Changes to Air Traffic Arrival and Departure Routes at Seattle-Tacoma International Airport

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This 1989 draft Environmental Assessment, prepared by the FAA's Air Traffic Division, evaluates proposed changes to arrival and departure flight routes at Seattle-Tacoma International Airport. The changes aimed to reduce air traffic congestion and improve airspace efficiency, particularly during peak demand periods when south-arrival capacity (42 aircraft/hour) lagged significantly behind north-arrival capacity (56 aircraft/hour). The inefficiency was linked to a requirement routing turbojet aircraft through Elliott Bay, a legacy of noise abatement agreements with local governments and the Port of Seattle dating back to 1970.

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Draft Environmental Assessment (EA) prepared by the Federal Aviation Administration (FAA) Air Traffic Division, Seattle, Washington, December 1989, assessing environmental effects of proposed alterations to arrival and departure air traffic routes at Seattle-Tacoma International Airport (Sea-Tac Airport). The EA addresses airspace inefficiencies caused by the requirement that turbojet aircraft landing to the south be routed through Elliott Bay, resulting in south arrival capacity of 42 aircraft per hour versus north arrival capacity of 56 aircraft per hour. Document discusses the Seattle ARTCC (Air Route Traffic Control Center), TRACON approach control facility, instrument operations, noise abatement procedures, and the Port of Seattle. Contact: Mr. Richard Prang, FAA, 17900 Pacific Highway South, Seattle, WA 98168, (206) 431-2530.

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