TagAIP(57)

Senate Bill 1167, introduced by Sen. Patty Murray in April 2023, would allow airports to receive additional federal funding to repair or replace sound insulation previously installed in nearby homes under the Airport Improvement Program. The bill provides a one-time waiver allowing airports to seek new federal assistance for sound insulation projects without prior government costs counting against them, provided the homes fall within the DNL 65 noise threshold or the original insulation caused physical damage. This legislation is particularly relevant to communities around Sea-Tac Airport, where aging soundproofing materials and ongoing aircraft noise concerns have prompted calls for updated noise mitigation support.

The Sound Insulation Treatment Repair and Replacement Program Act, introduced by Rep. Adam Smith (WA-09), would allow the FAA to waive a rule that currently prevents airports from using Airport Improvement Program (AIP) funds to repair or replace sound insulation in the same home more than once. The bill addresses problems caused by faulty materials and poor installation during noise mitigation programs in the 1980s and 1990s, which have led to structural damage and mold in some homes near airports like Sea-Tac. Eligible homeowners must have their issues verified by an FAA-compliant noise auditor, and repairs are generally limited to residences still within the airport's current 65 DNL noise contour.

H.R. 2533, the Sound Insulation Treatment Repair and Replacement Program Act, was introduced in April 2023 to allow airports to receive additional federal funding to repair or replace previously installed sound insulation in homes affected by aircraft noise. The bill allows the Secretary of Transportation to grant a one-time waiver so that prior government spending on a home's soundproofing does not count against the allowable project cost for new work. Homes are eligible if they fall within the FAA's DNL 65 noise standard or if an FAA-certified auditor determines that the original soundproofing caused physical damage to the residence.

The Sound Insulation Treatment Repair and Replacement Program Act, introduced in the 118th Congress by Mr. Smith of Washington, would allow airports to receive additional federal funds under the Airport Improvement Program to repair or replace previously installed sound insulation in residential homes affected by aircraft noise. The bill provides a one-time waiver so that prior government spending on a home's soundproofing would not count against the allowable project cost for new work. Eligibility is tied to whether the building falls within the FAA's Day Night Level (DNL) 65 noise standard or suffered damage from the original sound insulation treatment.

This 2022 FAA guidance letter explains how airports can legally spend airport revenue on noise insulation projects, such as new windows, doors, and air conditioning, for homes and schools located within the DNL 65 dBA noise contour — the federal threshold for significant aircraft noise impact. Spending airport revenue on noise insulation for properties outside that noise boundary is generally prohibited as revenue diversion, unless a lower local noise standard has been officially adopted or 'block rounding' has been approved. The letter also clarifies that airports may purchase mobile or permanent noise monitoring equipment using airport revenue, provided certain conditions are met, but monitors cannot be used to enforce noise abatement flight procedures.

This FAA document outlines the legal assurances that planning agency sponsors must agree to when receiving federal grant funds for airport development, planning, or noise compatibility programs. Sponsors certify compliance with a broad range of federal laws, executive orders, and regulations—including civil rights, disability, and environmental requirements—and must maintain proper financial records subject to federal audit. The agreement remains binding for the full life of the funded project.