Transport i lotnictwo · 20.09.1995

Proposed Amendment of the Type Certification Procedures for Changes in Helicopter Type Design To Attach or Remove External Equipment

This document proposes to amend the existing helicopter noise certification procedures with respect to certain changes in type designs. This proposal would amend the applicability of the noise certification procedures to exclude those changes in type design that involve the attachment or removal of external equipment, floats and skis, and certain airframe and operational changes made to accommodate such changes in type design (acoustical change requirements). This proposal would also exclude helicopter flight operations with doors and/or windows removed or in an open position from the applicability of the acoustical change requirements. This change would reconcile 14 CFR part 21 with the procedural treatment of external equipment in the original helicopter noise certification rulemaking effort and would make U.S. helicopter noise certification regulations more consistent with the International Civil Aviation Organization (ICAO) standards.