14 C.F.R. § 25.939 Turbine engine operating characteristics.
Title 14 - Aeronautics and Space
(a) Turbine engine operating characteristics must be investigated in flight to determine that no adverse characteristics (such as stall, surge, or flameout) are present, to a hazardous degree, during normal and emergency operation within the range of operating limitations of the airplane and of the engine. (b) [Reserved] (c) The turbine engine air inlet system may not, as a result of air flow distortion during normal operation, cause vibration harmful to the engine. [Amdt. 25–11, 32 FR 6912, May 5, 1967, as amended by Amdt. 25–40, 42 FR 15043, Mar. 17, 1977]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart E—Powerplant
General
§ 25.939 Turbine engine operating characteristics.
