Ground proximity warning system (10) monitoring the descent speed (14) of an airplane and issuing an alarm (24) if the descent speed is excessive relative to the altitude above the ground (12 ) of the aircraft, according to a predetermined relationship (18). The predetermined relationship is changed as a function of the deviation of the aircraft from the landing angle (16) to issue the alarm sooner if the aircraft is below the landing angle and more late if he's above. The warning is given as a specific acoustic message indicating the specific flight parameters of the aircraft.
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