Stage 3 Helicopter Noise Certification Standards

This rulemaking adopts more stringent noise certification standards for helicopters that are certificated in the United States (U.S.). This rule applies to applications for a new helicopter type design. It also allows applicants to upgrade Stage 1 and Stage 2 helicopters to Stage 3 when applying for a supplemental type certificate. A helicopter type certificated under this standard is designated as a Stage 3 helicopter. This rule adopts the same noise certification standards for helicopters that exist in the standards of the International Civil Aviation Organization (ICAO). These more stringent noise certification standards adopted into U.S. regulations will reduce noise exposure from helicopters certificated in the United Stated and are consistent with the FAA's goal of harmonizing U.S. regulations with international standards.