Aerospatiale Societe Nationale Industrielle

Alain G Lafortune

Francois Potdevin

The invention relates to a low-vulnerability device for the operation of a lifting and propulsing helicopter rotor by means of a cyclic plate mechanism, in which the non-rotating plate (5) is coupled at four points (1, 2, 3, 4) to four hydraulic actioning servocontrols each comprising a power jack (9), an anchoring system (10) and a servocontrol-distributor (41, 42), three servocontrols being used when normally working, the fourth being used in back-up in the event of a failure of one of the other three. Each power jack (9) is supplied by an independent hydraulic circuit which comprises the servocontrol-distributor (41, 42) operated by a mechanical input, connected to the cockpit by linkage (13), and a disengageable anchoring system. The mechanical inputs each comprise a system which, above a force threshold on a normally active servocontrol-distributor, neutralizes the servocontrol-distributor concerned, which initiates the starting up of the normally inactive servocontrol-distributor which then becomes operational in safeguard mode.

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Vitrolles, France

Alain G Lafortune