Abstract: A take-off director system provides the pilot with a visual display on a flight director indicator of the aircraft acceleration required to reach V.sub.1 speed within a length of runway calculated so that upon take-off abort the pilot will yet be able to stop the aircraft on the remaining runway; if the aircraft is not sufficiently accelerated (the accelerometer is fitted along the aircraft longitudinal axis) to enable it to reach V.sub.1 speed on a given length of runway, the system warns the pilot to abort the take-off well before reaching of V.sub.1. There is also a take-off abort warning when the pressure on the legs at V.sub.cmg speed is not reduced by a certain value depending on airport data and aircraft type. When the aircraft reaches V.sub.R speed, the system warns the pilot to pull the control column and indicates the pitch angle required to clear any obstacles.