Abstract: A secure conversion device for an aircraft equipped with a digital computer and an analog actuator, said device being capable of converting discrete digital controls provided by the computer into analog power signals transmitted to the analog actuator and making it possible to steer said actuator, comprises a security module, making it possible to identify inconsistencies in the discrete digital controls and to interrupt the transmission of the analog power signals toward the analog actuator when an inconsistency in the discrete digital controls is identified. The device also comprises a detection module, making it possible to determine power levels of the analog power signals. The device also comprises a monitoring module, making it possible to detect anomalies in power supply levels of components of the device.

Abstract: The invention relates to automatic pilot devices on board aircraft, and more particularly aircraft of the maritime patrol or surveillance type. The invention is a device able to be engaged instinctively, calculating at least two flight path modes, the first one being a horizontal circular flight path around a location point and the second one being the overflying of a location point according to a heading chosen on a horizontal line, and making it possible to direct the aircraft automatically according to these two flight paths.