TagPart 150(263)

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  • 2024-12-12

    Four-City Joint Comment Letter on Seattle-Tacoma International Airport SAMP Draft Environmental Assessment

    Four cities near Seattle-Tacoma International Airport — Burien, Normandy Park, SeaTac, and Des Moines — submitted formal comments in December 2024 objecting to the airport's Sustainable Airport Master Plan Environmental Assessment. The cities warn that planned growth will increase annual flight operations by nearly 20% by 2032, expanding the noise impact zone and exposing an estimated 22,000 residents to significant aircraft noise, up from about 14,000 in 2022. They call on the Port of Seattle to extend public review periods, improve its sound insulation program, and take proactive steps to protect the low-income and minority communities most burdened by airport noise.

  • SEL and DNL 65 Noise Metrics Educational Slide — Port Of Seattle Part 150 Study

    An educational slide produced by the Port of Seattle for Seattle-Tacoma International Airport explaining aircraft noise metrics, including Single Event Sound Level (SEL), Hourly LEQ, and Day-Night Level (DNL). The slide illustrates how varying numbers of daily flight events (1, 10, or 100) can produce identical DNL 65 noise levels, and includes charts showing sound levels over time periods ranging from seconds to 24 hours.

  • Part 150 09.24.2013_Commission_Presentation_Page_06

    A Port of Seattle presentation slide titled 'Continuing Programs With Some Modifications' describes modifying Engine Testing Maintenance Run-Up Regulations to include a Ground Run-Up Enclosure (GRE) when built. The accompanying photo shows a FedEx aircraft undergoing engine maintenance outside a hangar at Seattle-Tacoma International Airport.

  • Part 150 09.24.2013_Commission_Presentation_Page_10

    A Port of Seattle presentation slide titled 'New Measures' outlines four noise-mitigation initiatives: a multi-family tenant-occupied insulation pilot project for apartments, purchase of avigation easements on mobile/manufactured home parcels (pilot project), a feasibility study for sound insulation of churches and places of worship, and establishing feasible locations for a Ground Run-up Enclosure (GRE).

  • Part 150 09.24.2013_Commission_Presentation_Page_09

    A Port of Seattle presentation slide titled 'Continuing Programs with No Modifications' describes the continuation of a sound insulation program for schools previously identified as eligible in the Highline School District and Highline Community College, as funding permits. The slide includes a construction photo showing workers outside a single-story brick school building undergoing sound insulation work.

  • Part 150 09.24.2013_Commission_Presentation_Page_08

    A Port of Seattle presentation slide listing four continuing noise abatement programs at Sea-Tac Airport that require no modifications: Use of VOR Radials to Curb Aircraft Drifting from Noise Abatement Tracks, Preferential Runway Use (nighttime north flow corridor), Use of Flight Management System Procedures, and Use of Ground Equipment (gate power and conditioned air to reduce auxiliary power unit usage).
  • 2024-06-13

    Record of Approval: FAA Part 150 Noise Compatibility Program, King County International Airport/Boeing Field

    This document is the FAA's official Record of Approval for King County International Airport/Boeing Field's (Boeing Field/BFI) Noise Compatibility Program under Federal Aviation Regulation Part 150. It outlines six key recommendations to reduce aircraft noise impacts on nearby residents, including developing combined noise contours with Seattle-Tacoma International Airport, implementing quieter flight approach and departure procedures, and upgrading noise monitoring systems. The FAA reviewed and issued determinations on each recommendation, approving most measures on a voluntary basis while noting that approvals do not constitute commitments to implement the actions.
  • 2024-06-10

    SEL, Hourly LEQ, and DNL Aircraft Noise Measurement Diagram — Part 150 Study Technical Review Committee Meeting #1

    Three-panel educational diagram illustrating how aircraft noise is measured and averaged across different time scales: Single Event Sound Level (SEL) showing two aircraft flyovers with Lmax and duration annotations, Hourly LEQ showing cumulative noise over one hour, and Day-Night Level (DNL) showing 24-hour noise distribution with a 10-dB nighttime penalty applied during nighttime hours. No source organization or document identifier is visible.

  • Part 150 Noise Study Workshop (3)!

    Attend a workshop where the Port of Seattle will answer questions about this important study. The Part 150 program determines the noise boundary around the airport and opportunities for noise mitigation such as sound insulation. Saturday 10:00AM-12:00PM Glacier Middle School <a style="font-weight: inherit;" href="https://www.google.com/maps/place/2450+S+142nd+St,+SeaTac,+WA+98168/@47.4771754,-122.2999698,17z/data=!3m1!4b1!4m6!3m5!1s0x54904313e187ced5:0x2d39413c9853420e!8m2!3d47.4771754!4d-122.2999698!16s%2Fg%2F11cpgcgnql?entry=ttu">2450 S 142nd St., SeaTac, WA 98168</a>

  • Part 150 Noise Study Workshop (2)!

    Attend a workshop where the Port of Seattle will answer questions about this important study. The Part 150 program determines the noise boundary around the airport and opportunities for noise mitigation such as sound insulation. <td>6:00PM - 8:00 PM</td> </tr> <tr> <td>Location:</td> <td>Gregory Heights Elementary School <a style="font-weight: inherit;" href="https://www.google.com/maps/place/16201+16th+Ave+SW,+Burien,+WA+98166/@47.4583586,-122.3561792,17z/data=!4m6!3m5!1s0x5490449487dc7485:0x76156cc4d118ae49!8m2!3d47.4583586!4d-122.3561792!16s%2Fg%2F11bw4cncmq?entry=ttu">16201 16th Ave. SW, Burien WA 98166</a></td> </tr>