The pilot’s aggressive takeoff maneuver, which resulted in an accelerated stall and subsequent loss of control at an altitude that was too low for recovery. Contributing to the accident were (1) the operation of the airplane near its aft center of gravity limit and the pilot’s lack of training and experience with the handling qualities of the airplane in this flight regime; (2) the failure of Oahu Parachute Center and its contract mechanic to maintain the airplane in an airworthy condition and to detect and repair the airplane’s twisted left wing, which reduced the airplane’s stall margin; and (3) the Federal Aviation Administration’s (FAA) insufficient regulatory framework for overseeing parachute jump operations. Contributing to the pilot’s training deficiencies was the FAA’s lack of awareness that the pilot’s flight instructor was providing substandard training.