Abstract: Process for flying an aircraft in the "elevator speed maintenance mode" during altitude changes, in which for acquiring and/or maintaining a nominal speed it is supplied to the flight computer at the same time as the instantaneous speed of the aircraft, said computer producing the elevator control instruction, characterized in that a nominal speed is also simultaneously transmitted in continuous manner to the automatic thrust control member of the engines and in that the process is performed during two successive sequences, namely:a first sequence during which the elevator only receives a nose up instruction (on climbing) or a dive instruction (on descending) and the engines move to full thrust in the first case or to idling speed in the second anda second sequence, following the first, during which the real nominal speed is supplied to the elevator instruction computer and said same nominal speed increased (on climbing) or decreased (on descending) by a margin is supplied to the automatic thrust control memb

Abstract: The present invention relates to a device for controlling the speed of the engines of an aircraft. According to the invention, the mechanical transmission (8) between the servomotor (6) and the throttle lever (4) comprises a coupling which can be overridden by the deliberate action of the hand of the pilot on the throttle lever (4), and the computer (18) comparing the speed to be reached X OBJ and the limit speed of the engine X LIM and supplying a signal which is representative of the datum speed of the engine X CONS, is linked to a computer (28), linked to the computer (22) supplying a signal which is representative of the speed of the engine corresponding to the position of the throttle lever X(TLA), said computer (28) supplying, from signals from the computers (18) and (22), a signal which is representative of the demanded speed of the engine X COM, such that:if the relationX(TLA)-.DELTA..ltoreq.X CONS.ltoreq.X (TLA)+.DELTA. (1)(where .DELTA.