FAR 91.805 — Subsonic Noise Compliance

FAR 91.805 sets the final noise compliance deadline for subsonic airplanes operating in the United States. Here's what it says in plain language:

• On and after January 1, 1985, no person may operate any covered subsonic airplane to or from a U.S. airport unless that airplane has been shown to comply with Stage 2 or Stage 3 noise levels under Part 36 of the FARs.
• Limited exceptions apply under § 91.809 (foreign aircraft operating outside the contiguous U.S.) and § 91.811 (service to small communities), but otherwise compliance is mandatory.

Why it matters operationally: This rule is part of the FAA's long-running effort to reduce aircraft noise around airports and surrounding communities. If you fly or dispatch an older airplane covered by Subpart I, you must be able to verify that the aircraft has been certificated or modified (often via hush-kits or re-engining) to meet at least Stage 2 noise levels before operating to or from any U.S. airport. Operating a non-compliant subsonic airplane is a regulatory violation.