Abstract: Disclosed is a method and device for assisting guidance of an aircraft. A flight management system is used to determine guidance instructions that include speed instructions having at least one flight time constraint to guide the aircraft to a check-point. An accuracy level for complying with the flight time constraint and at least one error level for at least one flight parameter are generated by an accuracy generating unit. An operating margin for at least one second parameter is determined from the determined accuracy and error levels, with the operating margin being representative of air speed criterion values of the aircraft. A range determining unit is used to determine whether the range of air speed criterion values is within an air speed envelope of the aircraft, and the speed instructions are modified when the range of air speed criterion values is not within the air speed envelope.

Abstract: Method and device for aiding the guidance of an aircraft along a flight trajectory. The device makes it possible to cause the aircraft to pass at least one particular waypoint of the flight trajectory, at an associated target time, and to do so to within an associated temporal tolerance.

Abstract: The guidance system (1) comprises a first means (2) for guiding the aircraft while maintaining a spacing with another aircraft, a second means (3) for making the aircraft pass through a particular waypoint at a required passing time, and means (5) for selecting automatically one of said first and second means (2, 3).

Abstract: The device (1) comprises means (4, 7) for determining guidance instructions making it possible to guide the aircraft so that it passes a particular check-point at a time corresponding to a time constraint, taking into account an accuracy level relating to this time constraint and an error level for at least one parameter which is used in calculating said guidance instructions.

Abstract: The device 1 comprises means (3, 4, 5) making it possible to cause the aircraft to pass at least one particular waypoint of the flight trajectory, at an associated target time, and to do so to within an associated temporal tolerance.

Abstract: The guidance system (1) comprises a first means (2) for guiding the aircraft whilst maintaining a spacing with another aircraft, a second means (3) for making the aircraft pass through a particular waypoint at a required passing time, and means (5) for selecting automatically one of said first and second means (2, 3).