The Federal Aviation Administration has now updated guidance on how to develop and implement noise isolation programs to mitigate noise exposure for homes, schools, and medical and other facilities near airports.
The circular, Guidelines for sound insulation of structures exposed to aircraft noise, provides standards, processes and procedures, and guidelines for all phases of soundproofing program development and implementation. It also contains technical updates on program development, including property investigations, acoustic engineering principles and test methods, setting limits, and determining noise level reductions.
The main changes describe the details of the roles and responsibilities; procedures from program initiation to completion; acoustic testing standards, funding opportunities and project costs; and considerations for community outreach, project phasing, and soundproofing treatments.
The advisory circular entered into force upon its publication. Users who develop and manage soundproofing programs for airports may voluntarily comply with this advisory circular. The FAA considers the standards and processes described in this AC to be essential to the fidelity of noise reduction programs, however, this does not constitute a regulation. The benefits and usefulness of these guidelines are not affected by the ongoing FAA noise policy review.
Airports with established sound suppression programs should consult with the FAA regarding changes to current sound suppression programs that may require reassessment. This AC supersedes AC 150/5000-9A, which focused on the technical aspects of developing sound insulation programs, such as sound exposure and insulation measures.