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free fall ['fri:'fɔ:l]
abbr. ff
mil., logist. Phase of the drop during which the paratrooper or the load falls because of his own weight. It ends when the parachute starts working (FRA); A parachute maneuver in which the parachute is opened, either manually or automatically, at a predetermined altitude. (FRA)
USA A parachute maneuver in which the parachute is manually activated at the discretion of the jumper or automatically at a preset altitude (JP 3-17) see also airdrop, air movement, free drop, high velocity drop, low velocity drop