TagPart 150(262)
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1994-01-01Archive Box 1319: MSA Expert Panel Correspondence, Port Of Seattle Noise Management Reports, and Airport Litigation Documents (1994–1996)
This is an archival catalog record (CID 10994, Box 01287, Historical Box 1319) from the Port of Seattle Administration, prepared by Angie Daniels. It documents Dept Subject Files covering 1994–1996, including MSA (Major Supplementary Airport) feasibility studies, Puget Sound Regional Council airport site screening, Sea-Tac Far Part 150 land use/noise compatibility planning, expert panel correspondence, and exec board meetings on airport/noise topics. -
1993-04-15Noise Exposure Map NEM Future 1996 pg 210 from 1993 Part 150 Study
A Future Noise Exposure Map for Seattle-Tacoma International Airport projecting 1996 noise contours (Ldn 65, 70, and 75), showing affected land uses including residential, schools, and hospitals across the Sea-Tac area. Signed by R. Burr Stewart, Director of Aviation Planning, Port of Seattle, and dated April 15, 1993, at a scale of 1:36,000. -
1993-04-151991 Sea-Tac Part 150 Noise Exposure Map NEM
This is the official 1991 Existing Noise Exposure Map for Seattle-Tacoma International Airport, submitted in accordance with F.A.R. Part 150, signed by R. Bun Stewart, Director of Aviation Planning, Port of Seattle, on April 15, 1993. The map depicts Ldn noise contours (65, 70, and 75) over the surrounding communities including Seattle, Tukwila, SeaTac, Normandy Park, Burien, Kent, and Federal Way, with the Ldn 65 contour encompassing approximately 14,128 acres and 67,000 people. -
1993-04-15FAR Part 150 1991 Existing Noise Exposure Map (NEM) — Sea-Tac Airport
This is the official 1991 Existing Noise Exposure Map for Seattle-Tacoma International Airport, prepared in accordance with FAR Part 150. The map covers the Sea-Tac flight corridor from Puget Sound to Lake Washington, showing noise contours, jurisdictional boundaries across King County municipalities, and land use designations including residential, school, hospital/nursing home, mobile home park, and airport zones; it is signed by W.E. Bus-Street, Director of Aviation Planning, Seattle-Tacoma International Airport, and dated April 15, 1993. -
1992-09-01Approval of passenger facility charges of Seattle-Tacoma International Airport
In a September 1, 1992 letter to the FAA Administrator, the Regional Commission on Airport Affairs formally requests reconsideration of the FAA's August 14, 1992 decision approving Passenger Facility Charges (PFCs) at Seattle-Tacoma International Airport. The Commission, representing communities near Sea-Tac severely impacted by aircraft noise, argues that PFC funds should be redirected toward noise mitigation efforts rather than security improvements and preliminary studies, and that local governments were not properly notified or consulted during the PFC application process. The letter calls for increased funding levels for noise mitigation, cancellation of certain approved expenditures deemed inappropriate or excessive, and greater consideration of local government views in future PFC allocation decisions. -
1992-03-06Letter from James D. Chalupník to Richard Aramburu Regarding Sea-Tac Aircraft Noise Study 2: Ldн Metric and Integrated Noise Model
In this 1992 letter, acoustics expert James D. Chalupník explains to attorney Richard Aramburu how aircraft noise near Seattle's Sea-Tac Airport is measured and rated, focusing on the appropriateness of the Ldn metric and the data used in the FAA's Integrated Noise Model (INM). He outlines the key physical properties of noise—intensity, frequency distribution, and fluctuation over time—and describes how various weighting schemes, particularly the A-weighting (dBA) scale, are used to approximate human perception of loudness and annoyance. The letter also notes the limitations of simpler metrics and introduces more sophisticated rating methods such as Stevens' Loudness Level and Perceived Noise Level for evaluating aircraft noise. -
1991-01-01Seattle-Tacoma International Airport Noise Budget, January 1, 1991
The Seattle-Tacoma International Airport Noise Budget, effective January 1, 1991, is a formal agreement designed to limit and gradually reduce overall aircraft noise levels at Sea-Tac Airport. It establishes a system of noise allocations assigned to individual passenger and cargo carriers, measured through defined noise exposure levels, with limits enforced on both a quarterly and annual basis. The agreement outlines key definitions and rules governing how noise is measured, allocated, and managed, including provisions for new entrants, international carriers, and government aircraft. -
1991-01-01Part 150 Noise Exposure Map 1991 — Ldn 65 Contour Area and Population
Text states that the Ldn 65 noise contour contains approximately 14,128 acres and 67,000 people. This figure relates to the noise impact area around Sea-Tac Airport as defined by the Day-Night Average Sound Level (Ldn) metric. -
1990-03-16Day Night Average Sound Level (DNL): The Descriptor of Choice for Airport Noise Assessment
This 1990 FAA document explains why the Day Night Average Sound Level (DNL) was chosen as the standard metric for measuring airport noise. DNL averages noise exposure over a full 24-hour period, applying a penalty for nighttime flights, and has been adopted by multiple federal agencies—including the EPA, DOT, HUD, and DOD—as the most reliable way to assess how aircraft noise affects surrounding communities. The FAA formally incorporated DNL into federal regulation through FAR Part 150, Airport Noise Compatibility Planning, in 1981. -
1985-02-01Sea-Tac International Airport Part 150: Airport noise compatibility program
This 1985 document, prepared by the Port of Seattle, outlines the Part 150 Airport Noise Compatibility Program for Seattle-Tacoma (Sea-Tac) International Airport. It combines two phases: Phase I, Noise Exposure Maps (officially submitted to the FAA in October 1984), and Phase II, a Noise Compatibility Program adopted by the Port Commission in January 1985. Together, these phases identify noise exposure around the airport and propose measures to address compatibility between aircraft noise and surrounding land uses.