As the four parachutists were preparing to jump from the aircraft, the reserve parachute, of the parachutist who was standing on the wing strut of the aircraft, deployed. The reserve parachute was ejected forward over the leading edge of the wing causing the parachutist to be dragged over the wing before falling from the aircraft. This resulted in injury to the parachutist and the buckling of the inboard section of the leading edge of the wing. During the subsequent descent the parachutist activated the main parachute which failed to fully deploy. In an effort to reduce his high rate of descent he steered towards a large tree, contacting the branches before falling to the ground. Sections of the reserve parachute were lost during the descent and it was not possible to determine the reason for inadvertent deployment of the reserve parachute. The main parachute did not fully deploy because one of the steering toggles and some suspension lines became tangled with the streaming reserve parachute lines.
