FAR 91.859 — Noise Stage Modifications
FAR 91.859 explains how operators of older airplanes can get a special flight authorization to fly into the contiguous U.S. for Stage 3, 4, or 5 noise modifications.
FAR 91.859 provides a narrow exception for older airplanes that would otherwise be banned from operating in the contiguous United States because they don't meet current noise standards.
Under § 91.855, certain airplanes covered by § 91.801(c) are prohibited from operating to or from airports in the lower 48 states because their noise levels are too high. But these airplanes can't be modified to fix the problem unless they can fly to a maintenance facility. FAR 91.859 solves this catch-22.
Key points:
- Applies to airplanes subject to § 91.801(c) that are otherwise prohibited by § 91.855.
- Any person may apply for a special flight authorization.
- The flight must be for the purpose of obtaining modifications to meet Stage 3, Stage 4, or Stage 5 noise levels.
Operationally, this matters because it lets owners reposition non-compliant airplanes to a shop where hush-kits, re-engining, or other noise modifications can be installed to bring the aircraft back into legal service.
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