Abstract: This aircraft arrester net gear comprises at least one flexible frame having each at least one elementary net slidably mounted therein, in such a manner that when a forwardly projecting element of the aircraft engages the net the elementary nets can slide in relation to the frame and the horizontal width of the net mesh normally engaged by the aircraft wings is reduced; for this purpose, open-loop slack portions of the horizontal straps of the elementary nets are provided at each end thereof.

Abstract: In a gear for arresting aircraft at the ends of a takeoff or landing strip, a net is protected against weather conditions by being folded and enclosed in a bag pressed against the strip tarmac by fixed ropes, a movable rope being provided for normally closing said bag. When this rope is released, the net can move out from the bag, the rope movement being associated with the actuation of the posts supporting the lateral ends of the net disposed across the strip.

Abstract: The disclosure embraces a harness for a man carrying parachute including at least one mechanism for simultaneous releasing of a riser and of a harness fastening cross-link; the harness includes a means for positioning the connecting points of the riser at the level of the block which hold the harness fastening cross-link, one of the blocks including a lever to which a riser can be connected, the lever being maintained locked by a latch with the latch being maintained in engagement with the lever by a locking rod; the mechanism further includes a bracket which is maintained locked onto a support plate by a rod which holds the harness fastening cross-link so that when the rod is withdrawn, the lever pivots to release the riser and the bracket escapes to release the harness fastening cross-link.

Abstract: In this device for raising the net of an aircraft arresting gear, a post is pivotally mounted on each side of the strip in a frame structure disposed obliquely to the center line of the strip, this post being pivotally connected intermediate its ends to the piston-rod of a pneumatic cylinder, the net suspension rope passing through the top of each post before being anchored to the ground.

Abstract: A device for measuring transmission factors is comprised of an emitter of light impulses located at a distance from a main photoreceiver. The emitter and the main photoreceiver are optically conjugated by mirrors. An auxiliary photoreceiver located adjacent to the light emitter receives a constant portion of the flux emitted by this emitter and a flux coming from the ambient light. By establishing the ratio between the impulse-type electric signals transmitted by these photoreceivers, a value proportional to the transmission factor measured between the emitter and the main photoreceiver is obtained.