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Sea-Tac International Airport: Commercial Aircraft Noise Footprint Comparison

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This Sea-Tac International Airport brochure, prepared by the Port of Seattle in Summer 1998, compares the noise footprints of Stage II jets, Stage III jets, and general aviation/commuter aircraft to help residents understand the noise impacts of different aircraft types. It explains that Stage III aircraft are significantly quieter than Stage II aircraft, and that replacing older Stage II planes with newer Stage III models would meaningfully reduce noise levels in surrounding communities. The document also defines key noise measurement terminology, including DNL (Day-Night Average Sound Level), and notes that nighttime flights carry a 10-decibel penalty in noise accounting.

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Notes

Port of Seattle brochure comparing noise footprints (DNL) of Stage II jet aircraft (727-200, 727-100, DC860, DC930, F28), Stage III jet aircraft (747-400, DC1030, 757-200, 737-300, 737-400, 737-200 Hush, MD82), and General Aviation & Commuter aircraft (Gulfstream 4, Cessna Citation 5, Dash 8, Dornier 328) at Seattle-Tacoma International Airport (Sea-Tac Airport). Explains Day-Night Average Sound Level (DNL) metric, noise contour graphics scaled in feet and miles, and the Part 150 Noise Compatibility Study. Prepared by Coffman Associates Airport Consultants, Summer 1998. Includes acknowledgment letter dated 2/17/10 from Sea-Tac Airport Noise Programs Office referencing Part 150 Study and Sierra Club public hearing on Cascade Runway 3rd runway project at Foster High School, Tukwila.

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