Ses 0W 6621 Px H 0 Od 8R ANES 2021 Aircraft Noise Dispersion Section 175

When proposing a new area navigation departure procedure, or amending an existing procedure that would direct aircraft between the surface and 6,000 feet above ground level over noise sensitive areas, the Administrator of the Federal Aviation Administration shall consider the feasibility of dispersal headings or other lateral track variations to address community noise concerns, if— (1) the affected airport operator, in consultation with the affected community, submits a request to the Administrator for such a consideration; (2) the airport operator’s request would not, in the judgment of the Administrator, conflict with the safe and efficient operation of the national airspace system; and (3) the effect of a modified departure procedure would not significantly increase noise over noise sensitive areas, as determined by the Administrator. What is Dispersion? • The process of introducing track variability by changing aircraft lateral position enough to spread out repetitive noise events experienced by people living under highly concentrated flight paths. Natural vs. Operational Dispersion • Natural (or random) • Associated with manually flown conventional procedures and ATC vectors • Operational • Aircraft use alternative flight paths with very precise and predictable trajectories but in a controlled manner • This type of dispersion is most associated with the use of satellite-based navigation capabilities • Examples • Radar Vectors to RNAV • Open SIDs • Additional departure tracks Naturally Occurring Concentration • It is very important to note that concentration is not just due to PBN or NextGen. It's also more accurate trajectories on conventional procedures enabled…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]