METHOD AND A DEVICE FOR PROTECTING AN OVERSPEEDING ROTORCRAFT ENGINE

摘要

A method of stopping an overspeeding engine (4) of a rotorcraft (1). A protection device stops the overspeeding engine (4) on condition of a comparison between a mechanical power requirement (19) of the rotorcraft (1) and a predefined power threshold (22). Stopping of the overspeeding engine (4) is authorized by the protection device (8) on condition that said mechanical power requirement (19) is identified as being less than or equal to the predefined power threshold (22). The mechanical power requirement (19) of the rotorcraft (1) is calculated on the basis of at least one current or anticipated value for the opposing torque (15) of a main rotor (5) of the rotorcraft.

主权项

1. A method of stopping an engine of a rotorcraft when the engine is in overspeed, the rotorcraft having at least one said engine driving power absorber members of the rotorcraft including at least one rotor comprising at least a main rotor having a substantially vertical axis, the method comprising an operation of detecting overspeed of said engine and an operation of detecting at least one specific stage of flight of the rotorcraft determining whether or not use is to be made of a protection device for stopping the engine in an event of overspeed of the engine being detected, wherein said specific stage of flight is identified by a mechanical power requirement of the rotorcraft that needs to be delivered by said at least one engine, stopping of the engine in overspeed by the protection device depending on an operation of comparing said mechanical power requirement and a predefined power threshold, with the engine in overspeed being stopped by the protection device on condition that said mechanical power requirement is identified as being less than or equal to the predefined power threshold.