Patent ID: 7990285

Claim:
A method for producing an audible warning in an aircraft when an aircraft autopilot is deactivated, the audible warning comprising a first sound and a second sound, and the aircraft having a button that is used as an autopilot deactivation button a pilot can press to deactivate the aircraft autopilot and as an acknowledgement button said pilot can press to acknowledge the audible warning, said method comprising: a) emitting the first sound in a cockpit of the aircraft for a period of time ranging between a first predetermined value and a second predetermined value when information that the aircraft autopilot has switched from an activated state to the deactivated state is received; and b) emitting the second sound in the cockpit of the aircraft, the acknowledgement of the audible warning by the pilot of the aircraft being taken into account, such that: if the audible warning is acknowledged by the pilot of the aircraft during a period of time corresponding to said first predetermined value, the emission of the first sound is sustained for a period of time corresponding to said first predetermined value, then the emission of said first sound is deactivated and the emission of said second sound is not activated; if the audible warning is acknowledged by the pilot of the aircraft at a moment that corresponds to the first sound having lasted for a period of time comprised between said first predetermined value and said second predetermined value, the emission of said first sound is canceled; if the audible warning is not acknowledged by the pilot of the aircraft during a period of time corresponding to said second predetermined value, the emission of said second sound is activated; if the audible warning is not acknowledged by the pilot of the aircraft while the first sound is being emitted, then a period of time for which the second sound is emitted is at least equal to a third predetermined value; and if the pilot of the aircraft acknowledges the audible warning, then the emission of said second sound is canceled.