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CRS   INSIGHT


Categorical Exclusions, Metroplexes, and Aircraft Noise

Complaints

August 6, 2018 (IN10947)




Related  Author


      Bart Elia5




Bart Elias, Specialist in Aviation Policy (bi r I crc v 7-7771)

The Federal Aviation Administration (FAA) has initiated changes to airspace and flight procedures to take advantage of
new technologies deployed under NextGen, a comprehensive air traffic modernization initiative that relies on sate1.1te-
based navigation and trading to improve efficiency and airspace capacity. In some neighborhoods, however, FAA's
changes have increased overflights triggering complaints about aircraft noise. Some affected residents are seeking
remedies from the agency, the courts, and Congress.

Categorical Exclusions

One of NextGen's key objectives is to allow commercial jets to utilize more direct routes and more efficient arrival and
departure paths to save time and fuel. The 2012 FAA reauthorization act (P L 1-12-95) directed FAA to accelerate the
deployment of Nexten  procedures. It authorized FAA to streamline environmental reviews of these changes so long as
the new procedures would result in measurable reductions in fuel consumption, carbon emissions, and noise on a per-
flight basis. In legal parlance, the NextGen procedures were statutorily granted  ex   i  from detailed
environmental analysis. This status is typically reserved for actions that individually or cumulatively do not have a
significant effect on the human.environment.

NextGen  procedures have generally met the statutory criteria for categorical exclusion because they specify more direct
routing and require fewer intermediate altitude level-offs, thereby reducing engine thrust and fuel consumption. While
noise and emissions have decreased on a per-flight basis, aggregate noise from multiple flights has increased in certain
communities. This is because some new procedures route aircraft over areas not previously overflown, and because the
greater precision of satellite-based navigation concentrates arriving and departing flights along narrower paths rather
than having natural dispersion as a result of navigational inaccuracies inherent with older technologies.

Metroplexes

FAA  has implemented NextGen procedures by redesigning terminal airspace around the largest urban areas. It refers to
these initiatives as metroplexes, a contraction of metropolitan and complexes that describes very large metropolitan
areas, often consisting of two or more cities. FAA has identified 21 metroplexes where multiple airports are located in

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