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§ 27.939 - 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 rotorcraft and of the engine.

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

For governor-controlled engines, it must be shown that there exists no hazardous torsional instability of the drive system associated with critical combinations of power, rotational speed, and control displacement.

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§ 27.939 - Turbine engine operating characteristics.