Sec. 25.939 — Turbine engine operating characteristics.
(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.
(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]
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