; or (B) the implementation period of the airport operator’s noise compatibility program. . 175. Addressing community noise concerns 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. 176. Community involvement in FAA NextGen projects located in metroplexes (a) Community involvement policy Not later than 180 days after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall complete a review of the Federal Aviation Administration’s community involvement practices for Next Generation Air Transportation System (NextGen) projects located in metroplexes identified by the Administration. The review shall include, at a minimum, a determination of how and when to engage airports and communities in performance-based navigation proposals. (b) Report Not later than 60 days after completion of the review, the Administrator shall submit to the appropriate committees of Congress a report on— (1) how the Administration will improve community involvement practices for NextGen projects located in metroplexes; (2) how and when the Administration will engage airports and communities in performance-based navigation proposals