Abstract: A gas-oil pressure accumulator having a load-bearing structure of composite material, suitable for aircraft hydraulic circuits. The accumulator is formed of a cylindrical body with closed ends, at least one of which is composed of a convex cap. A piston slideable in the cylindrical body defines two chambers, one adapted for containing hydraulic oil and the other adapted for containing gas under pressure.

Abstract: A servoactuator unit to operate flight-control mechanisms, in particular for control of the position of the oscillating plate which adjusts the cyclic pitch and collective pitch of helicopter rotors, in which two pairs of hydraulic actuators are used, connected together in parallel, arranged with their axes parallel and close together like the diagonals of a quadrilateral, their rods connected together at their end and acting on the said oscillating plate and the cylinders also being connected together at the back. Each pair of actuators is powered, through a servovalve, by an independent hydraulic circuit so as to enable operation even in the event of one of the pairs breaking down, with symmetrical stress being placed on the pair of actuators during operation.

Abstract: A device for taking up wear in a disc brake assembly which is particularly suitable for aircraft comprises first and second spaced jaw members carrying a piston and cylinder actuating assembly operable by fluid pressure to displace friction linings and disc brakes towards one of the jaw members to compress the friction linings against the disc brakes and effect braking. The piston is in two telescoping parts and friction rings disposed therebetween normally retain the relative position of the two piston parts against the effect of a spring which operates on one of the piston parts to return the piston to a rest position. The displacement of this one piston part from the rest position is limited by an abutment and, in the event of this limited displacement being insufficient to effect braking, due to wear in the friction linings, the other piston part is displaced further by the fluid pressure against the effect of the friction rings to effect braking.