§ 25.939 - Turbine engine operating characteristics.

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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.

[Reserved]

The turbine engine air inlet system may not, as a result of air flow distortion during normal operation, cause vibration harmful to the engine.