Abstract: A shut-off system for an orifice of a duct, particularly for an orifice of an air inlet passage that allows air into the combustion chamber of a ramjet, includes a shutter for shutting off the orifice of the duct, and a controllable actuating device capable of acting on the shutter to uncover the orifice. The shutter includes a removable cap which is held on the duct and a locking device which keeps the cap on the duct by at least one locked jaw, which is unlockable. The actuating device includes at least one controllable striker which is capable of unlocking the jaw in such a way as to cause the cap to be ejected from the duct and to uncover the orifice.

Abstract: An Eyepiece-support arm assembly device on an aircraft. The device comprises flanges formed on the eyepiece-support arm and on a support attached to the aircraft, along with a retention belt (32) liable to be set to a locking status, wherein the arm is immobilised in relation to the support, a setting status, wherein the arm can be moved between a position for use and a retracted position, and a disassembly status allowing the assembly and disassembly of the eyepiece-support arm, without modifying the setting. The status is changed by operating levers (44, 46).

Abstract: Blanking-cap system for an orifice of a duct, in particular for an orifice of an air-intake duct into the combustion chamber of a ramjet. The blanking-cap system (16) includes a glass blanking cap (15) and a destruction device (17) which comprises a projectile (18) capable of destroying the blanking cap (15), and a controllable projection means (19), which is capable of projecting the said projectile (18) and which is arranged outside the conduit (7) while being oriented in such a way as to be able to project the said projectile (18) onto the said blanking cap (15).

Abstract: The present invention relates to a suspension device (4) for connecting an item of on-board equipment (2) to the structure (3) of a vehicle, particularly a rotary-wing aircraft, said suspension device (4) comprising first and second parts (5, 6) shaped in the form of plates and capable of being fixed to said structure (3) and to said item of equipment (2), and suspension means (7) which are arranged between said first and second parts (5, 6). According to the invention, the suspension device (4) additionally comprises a locking system (20) capable of bringing the suspension device (4) into one of two positions: a locked position in which the locking system (20) immobilizes the first and second parts (5, 6) one with respect to the other, and an unlocked position in which the locking system (20) releases said parts (5, 6) so that they can move relative to one another, and means (21) for controlling the locking system (20).

Abstract: A sequential trigger system (10) for triggering a plurality of cameras (42, 42a) equipped with a burst picture taking mode is provided. The system includes a clock (12) and means (14, 16) of fixing the frequency of the clock frequency, and further includes means (20) of successively starting operation of the cameras in burst mode in response to a trigger signal, the means being controlled by the clock so as to put the cameras into operation at an operating rate faster than the rate at which the cameras take pictures in burst mode.

Abstract: An optical sighting system includes at least one optical channel with which there is associated at least one reticle. The reticle includes at least one mark which demarcates a blind spot, which is visible to an observer using the optical sighing system and which is centered approximately about a centering point that is situated substantially at a distance which is representative of a sighting angle of between 13° and 18°, with respect to a predetermined direction of observation along a first direction. This first direction is representative on the optical sighting system of the direction passing substantially by the centers of the eyes of an observer who is using the optical sighting system.

Abstract: The invention relates to an emitter of infrared radiation in band III as well as to a composite allowing the emission of such infrared radiation. The emitter includes an emission source having a composite on which a thin oxide layer is deposited. The oxide has an emissivity which is less than 0.2 for wavelengths of emitted radiation of less than 6 &mgr;m and greater than 0.8 for wavelengths of between 8 and 10 &mgr;m. The invention also includes a heating device which can heat the composite so that it emits infrared radiation in band III.

Abstract: The present invention relates to a laser-scan process for guiding a missile (M) to a target (T), according to which one observes a field (5), within which said missile (M) is liable to move, so as to locate the latter in said field (5), as well as to a device for implementing said process. According to the invention, in said field (5), a zone (8) is determined around the instantaneous position of said missile (M) thus located, and the laser scan is performed solely in said zone (8).