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UC Davis Aircraft Noise and Emissions Symposium Davis, CA May 3, 2023 Sonic Boom Moves With The Aircraft Speed Limit Or Noise Limit? C.F.R.§91.817 Civil Aircraft Sonic Boom (a) No person may operate a civil aircraft in the United States at a true flight Mach number greater than 1… (b) In addition, no person may operate a civil aircraft for which the maximum operating limit MM0 exceeds a Mach number of 1, to or from an airport in the United States… The Quesst mission will collect data to inform regulation of civil supersonic flight over land. https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-I/section-91.817 The Quesst Mission Phase 1—X-59 Aircraft Development • Detailed design • Fabrication, integration, ground test • Checkout flights • Subsonic envelope expansion • Supersonic envelope expansion Phase 3—Community Response • Multiple campaigns across U.S. • Community response surveys • Ground measurements in communities • Data analysis • Database delivery for regulators Phase 2—Acoustic Validation • In-flight and ground measurements • Validation of X-59 signature and prediction tools • Development of acoustic prediction tools for Phase 3 Image Credit: Lockheed Martin National and International Regulatory Entities ➢ Federal Aviation Administration (FAA) • FAA Reauthorization Act of 2018—Pub. L. 115-254§181 ➢ Committee on Aviation Environmental Protection (CAEP) • Committee within International Civil Aviation Organization (ICAO) • FAA is United States representative to CAEP • NASA serves as technical advisor to FAA ➢NASA community test data support standards development ICAO Committee on Aviation Environmental Protection (CAEP) Working Group 1: Noise Supersonics Task Group (SSTG) Procedures Subgroup…

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