Piper PA-36-375 Pawnee Brave Accident at Porterville Airstrip (ZS-KHR)

Overview and Flight Details On the morning of 24 April 2025, a Piper PA-36-375 Pawnee Brave with registration ZS-KHR was conducting an agricultural crop-spraying operation under Part 137 of the Civil Aviation Regulations. The flight departed from Porterville Airstrip in the Western Cape, South Africa, with the pilot intending to return to the same location. Visual meteorological conditions prevailed during the daylight operation. ## Accident Sequence The aircraft, equipped with a 1,000-litre chemical hopper, carried 200 litres of Avgas 100 Low Lead and 150 litres of insecticide at the start of the flight. After takeoff, the pilot climbed to 1,000 feet above ground level and cruised at 140 mph toward a citrus farm located approximately 20 kilometres north of the airstrip. Upon arrival, the pilot circled the area to scan for obstacles before beginning the first spray run. During the application, the aircraft encountered a sudden downdraft from the mountain on the leeward side. The loss of lift caused the main wheels and spray boom to strike the 30-foot citrus treetops. The aircraft subsequently pitched down and crashed to the ground. The pilot, who was the sole occupant, turned off the master and fuel switches and exited the aircraft unassisted without injury. The aircraft sustained substantial damage. ## Aircraft and Pilot Information The aircraft, serial number 36-7802059, had 9,072.01 total airframe hours at the time of the accident. The pilot held a valid Commercial Pilot Licence with 9,871 total hours, including 4,717 hours on type. Technical records indicated no outstanding defects, and the pilot reported no pre-impact mechanical malfunctions. ## Probable Cause and Safety Actions The accident occurred at GPS coordinates 32°37'30.0” South, 18°56'17.0” East, at an elevation of 442 feet. The investigation determined that the aircraft struck the treetops after experiencing a downdraft that caused it to lose height. The report highlighted the dangers of mountain waves in mountainous areas and advised operators and pilots to remain aware of these conditions.