Airbus Helicopters

Aerospatiale Societe Nationale Industrielle

Francois Potdevin

Jean-Francois Piccone

Alain G Lafortune

A landing gear () provided with first and second longitudinal bearing skids () and with first and second transverse crossbars (). The landing gear includes at least one resilient fastener device () together with at least one blocking means () and at least one centering means () for each crossbar.

Skid landing gear and an aircraft provided with such landing gear

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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Ventabren, France

Francois Potdevin