Early reports from the Accident Investigation team as to the cause of the Alentejo air crash on June 19th, which killed the Belgian pilot and injured four of the seven skydivers onboard, indicate the structure of the aeroplane simply disintegrated in mid-air.
Three of the parachutists were unconscious when they fell from the Pilatus PC6 at around 7,000 feet but were saved by their parachutes which automatically opened due to a fail-safe barometric trigger.