Combined standby instruments for aircraft

G - Physics – 01 – C

Patent

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Details

G01C 23/00 (2006.01)

Patent

CA 2346510

The invention concerns standby instruments to assist piloting of an aircraft designed to supply, with high operating safety, indications concerning the aircraft pressure altitude, calibrated airspeed and attitude (roll and pitch angles), in order to serve both as reference for controlling the proper functioning of the main flight instruments and as standby in case of faulty functioning. More particularly, the invention concerns combined standby instruments comprising an electronics part providing it with computing power. It consists in forecasting, in said combined instruments which operate exclusively on the basis of total pressure, static and inertial pressure measurements coming from their own sensors, a correction of the static pressure measurement error caused by the aircraft aerodynamic angle of attack worked out solely from data already available to said standby instruments, in order to improve accuracy of pressure altitude without, however, increasing costs or reducing the safety of said combined standby instruments.

La présente invention est relative aux instruments de secours pour l'aide au pilotage d'un aéronef destinés à fournir, avec une grande sécurité de fonctionnement, des indications concernant l'altitude pression, la vitesse conventionnelle et l'attitude (angles de roulis et de tangage) de l'aéronef, cela dans un but de servir à la fois de référence pour le contrôle du bon fonctionnement des systèmes principaux d'instruments de bord et de secours en cas de défaillance du ou des systèmes principaux d'instruments de bord. Elle concerne plus particulièrement des instruments combinés de secours comportant une part d'électronique les dotant d'une certaine puissance de calcul. Elle consiste à prévoir, dans ces instruments combinés de secours qui opèrent exclusivement à partir de mesures de pression totale, de pression statique et inertielles provenant de leurs propres capteurs, une correction de l'erreur de mesure de pression statique due à l'angle d'incidence aérodynamique de l'avion élaborée uniquement à partir des informations déjà à la disposition de ces instruments de secours, cela pour améliorer la précision de l'indication d'altitude pression sans pour autant augmenter le coût ou diminuer la sécurité de fonctionnement desdits instruments combinés de secours.

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