11a. Attachment
02 SEA Stakeholder Advisory Round Table 2023 Report
Action Items Late Night Noise Limitation Program Description Voluntary measure to reduce late night (12:00 AM to 5:00 AM) noise by incentivizing air carriers to fly at less noise sensitive hours or transition to quieter aircraft • Ongoing outreach with air carriers about possible late night schedule and aircraft fleet changes including meetings with carriers with the most noise exceedances • Established noise thresholds that identify aircraft exceeding noise thresholds during the late night hours • Late night noise threshold observance tracked and reported out on a quarterly basis and publicized as part of the Fly Quiet Program Reduction of aircraft noise during the late night hours Components Change Key Responsible Parties Status Update Port of Seattle, airlines and air cargo carriers COMPLETE - Program commenced in July 2019 with regular reporting each quarter to external audiences. In 2021, the program achieved its first significant success when EVA Air made the switch to a quieter, newer aircraft during the late night hours. In 2023, the program achieved another accomplishment when FedEx Express began incorporating quieter, newer aircraft into their fleet. SEA Stakeholder Advisory Round Table (StART) Aviation Noise Working Group Aviation Near-term Noise Action Agenda Summary (as of 4/24) Runway Use Program Glide Slope Adjustment Ground Noise Study Item No. 11a_attachment_2 Meeting Date: May 14, 2024 Discouraging Reverse Thrust When conditions are right, discourage overuse of reverse thrust to deaccelerate aircraft Encouraging Continuous Taxi to Takeoffs When conditions are right, promote continuous taxi to takeoffs (rolling takeoffs) Noise Comment Reporting Provide up-to-date, accessible information on noise complaints and comments submitted by the public Traditional takeoffs were Monthly statistic and identified as a source of heat map reports posted noise in the Ground Noise on Port website detailing Study. totals and trends by city, zip code and subject matter. Regular updates regarding noise complaint data provided at StART meetings. Revise the current informal Runway Use Program to minimize use of the Third Runway during the late night (12:00 AM to 5:00 AM) Updated language for: • Third Runway daytime/evening runway usage • Third Runway late night runway usage Raise Runway 34R’s glideslope to lessen aircraft approach noise Analyze airfield ground noise sources and identify potential mitigation measures Considered various strategies and timelines for raising Runway 34R’s 2.75 degrees glideslope and settled on plan to permanently relocate 34R’s navigational aids and pursue a 3.0 degrees glideslope with the FAA Major ground noise sources identified in the study: • Stop and go aircraft sequencing/queuing • Traditional takeoffs • Reverse thrust • Auxiliary Power Unit (APU) use • Engine maintenance run-ups • Dual engine taxiing Reverse thrust was identified as a source of noise in the Ground Noise Study Reduction of aircraft noise for Third Runway adjacent communities and communities underneath the Third Runway’s flightpath Port of Seattle and FAA Potential reduction of aircraft noise for communities south of SEA Reduction of aviation noise for close-in communities surrounding SEA Reduction of aircraft noise for close-in airport communities Modest reduction of aircraft noise for communities close to the runway ends Transparent and convenient information on noise complaints and comments submitted by public Port of Seattle and FAA Port of Seattle, FAA, airlines and air cargo carriers IN PROCESS - The 34R glide slope adjustment is incorporated into a SEA taxiway reconfiguration project. Preliminary design is complete. Implementation is contingent on the Sustainable Airport Master Plan’s (SAMP) finalization and FAA approval. Port of Seattle, FAA, airlines and air cargo carriers COMPLETE – New SEA voluntary language promoting use of continuous taxi to takeoffs implemented in July 2023. Air carrier awareness campaign occurred over the summer of -2023. Port of Seattle COMPLETE - Implemented in September 2019. Late night operations on the Third Runway dropped dramatically from an average of 12 nightly landings pre-implementation to an average of less than two nightly landings in 2023. Usage continues to be monitored and details communicated at StART meetings. Port of Seattle, FAA, airlines and air cargo carriers COMPLETE – After regular check-ins with StART’s Aviation Noise Working Group, the consultants completed the study in May 2022. The study identified several potential mitigation measures that the working group has either implemented or continues to investigate. COMPLETE – Updated SEA voluntary language discouraging use of reverse thrust at all times and beyond what is necessary, implemented in January 2023. Air carrier awareness campaign occurred over the summer of 2023. COMPLETE – Monthly reports began with June 2020.
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