Delayed Deceleration Approach Noise Impact and Modeling Validation

13-C-AJFF-MIT-050, 073This manuscript was sponsored by the Federal Aviation Administration (FAA) under Aviation Sustainability Center\u2019s Center of Excellence Project 44.This item is held in a repository external to US DOT and NTL. NTL provides this record to document USDOT's funding of this research. You may access the item at this link: https://doi.org/10.2514/1.C036631Presented as Paper 2021-2135 at the AIAA Aviation 2021 Forum, Virtual Event, August 2\u20136, 2021; received 2 August 2021; revision received 26 November 2021; accepted for publication 1 December 2021; published online Open Access 28 January 2022. Copyright \ua9 2021 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-3868 to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.A validation methodology and evaluation of delayed deceleration approach performance and noise-impact modeling using noise measurements and radar data are presented. Advanced procedures such as delayed deceleration approaches, where aircraft maintain higher speeds and therefore remain cleanly configured and at lower thrust levels for longer flight periods, can be used for airport noise abatement. Delayed deceleration approaches have been shown in modeling to offer noise reductions before the stabilization point compared to procedures that decelerate early. The delayed deceleration approach validation methodology is demonstrated through monitoring of operational radar data with varying velocity profiles from Boeing 737, Airbus A320, and Embraer E190 flights and comparing modeled sound exposure levels of these procedures with available ground-noise-monitor data at two major airports. Thrust from radar flights was modeled based on weight predicted from final approach speed and assumed configuration. When corrected for atmospheric conditions, modeled noise is shown to be consistent with noisemonitor readings under reasonable flap-deployment schedule assumptions during observed early, intermediate, and delayed deceleration approaches. In addition, delayed deceleration approaches correlated with monitor readings with lower noise levels of an average of 3\u20136 dB compared to early deceleration approaches across different aircraft types