Aviation Environmental Design Tool

On January 13, 2021, the Federal Aviation Administration (“FAA”) published, in the Federal Register, Vol. 86, No. 8, Docket No. FAA-2021-0037, p. 2722, a necessary, if somewhat belated, “summary to the public of the research programs it sponsors . . . that could potentially inform future aircraft noise policy.” While the “spirit” appears willing, the “execution” is weak.

FAA first claims, by way of “background,” that “the number of people living in areas exposed to SIGNIFICANT levels of aircraft noise in the United States has declined from roughly 7 million to just over 400,000 today.” Id., at 2723 [emphasis added]. FAA credits that reduction principally to “phased transition to quieter aircraft;” efforts by local governments to reduce the number of people living in close proximity to airports through planning; sound insulation; and, perhaps most ironically, the introduction of Performance Based Navigation (“PBN”), or RNAV procedures which consolidate flight corridors, thus reducing the NUMBER of persons overflown, while, at the same time, increasing noise for residents under the newly consolidated flight tracks.

FAA’s conclusions are skewed by reliance on outdated assumptions.

Continue Reading FAA Research on Environmental Issues Ignores Significant Factors in Public Discontent

In a marked change in longtime Federal Aviation Administration (“FAA”) policy regarding analysis of noise and air quality impacts from FAA initiated, directed or funded projects, FAA has substituted a single new model for the long mandated Integrated Noise Model (“INM”) and Emissions and Dispersion Modeling System (“EDMS”).  Beginning May 29, 2015, FAA policy “requires” the use of the Aviation Environmental Design Tool version 2b (“AEDT 2b”), which integrates analysis of aircraft noise, air pollutant emissions, and fuel burn.  These impacts, according to FAA are “interdependent and occur simultaneously throughout all phases of flight.”  80 Fed.Reg. 27853.  

 
The FAA policy provides for differential displacement of existing analytic models.  For air traffic and airspace procedural changes, AEDT 2b replaces AEDT 2a, already in use.  For other, ground based projects, AEDT 2b replaces both the INM, for analyzing aircraft noise, and EDMS for developing emissions inventories and modeling emissions dispersion.  The change was presaged by FAA Administrator Michael Huerta who announced in April that FAA was undertaking an “ambitious project” to revamp its approach to measuring noise.  The “ambitious project” was apparently inspired by the vocal objections to the results of the analysis using current methodologies, voiced by citizens of locals that have experienced the effects of FAA’s current, nationwide reorganization of airspace around major airports to institute procedures based on Performance Based Navigation (“PBN”).  
 


Continue Reading FAA Requires New Integrated Model for Noise and Air Quality Impact Analysis