Abstract: A method for determining a minimum control speed for an aircraft includes measuring, during at least one flight of the aircraft, the values of predefined parameters, recording these values in a memory, and determining, on the basis of these measurements and of at least one predefined certification value received from memory, a certification value (Cnfcertif) for the yaw moment (Cnf) created by the shutting down of one engine of the aircraft. The certification value (Cnfcertif) is used to determine the minimum control speed. On the basis of measured values of the sideslip (&bgr;), the lateral force (Cy), and a certification value (Cycertif), a certification value (&bgr;certif) is determined, and, on the basis of the measured value of the sideslip (&bgr;), the lateral force (Cy), the yaw moment (Cnf), and the certification values (Cycertif) and (&bgr;certif), the certification value (Cnfcertif) is determined.

Abstract: According to this method, during at least one flight of said aircraft, the values of predefined parameters are measured and, on the basis of said measurements recorded in a memory (3) and of at least one predefined certification value received from a memory (9), a certification value Cnfcertif for the yaw moment cnf created by the shutting down of one engine of the aircraft is determined, which value will be used to determine the minimum control speed. According to the invention, on the basis of measured values of the sideslip &bgr; and of the lateral force Cy, and of a certification value Cycertif, a certification value &bgr;certif is determined (E1) In addition, on the basis of the measured values of the sideslip &bgr;, of the lateral force Cy and of the yaw moment Cnf, and of the certification values Cycertif and &bgr;certif, said certification value Cnfcertif is determined (E2).