In July 2005, the FAA issued a final rule to adopt the ICAO "Chapter 4" standard as the new U.S. "Stage 4" standard. Under Stage 4, new type design aircraft certified on or after January 1, 2006 have to be 10 decibels quieter (as measured at the specified flyover, lateral, and approach points) than the previous Stage 3 noise standard required. As it applies to new type designs only, this certification standard does not apply to pre-existing aircraft or to the continued production of types previously certified.
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