What happened
On the afternoon of 22 November 2024, a Cessna 150F, registration ZS-EJE, departed Swellendam Grebel Airfield (FASX) for Mossel Bay Airfield (FAMO) under visual meteorological conditions. The flight was being operated as a private flight under Part 91 regulations.
Following a standard pre-flight inspection and engine run-ups on the upslope Runway 33, the aircraft took off. Shortly after clearing the runway threshold and passing over rising terrain, the aircraft encountered a powerful downdraft. Unable to maintain sufficient altitude to clear the higher ground, the pilot executed a precautionary landing. The aircraft came to rest approximately 300 meters from the runway threshold on rough terrain. While the pilot and passenger escaped without 0 injuries, the aircraft sustained substantial damage, specifically to the left aileron and the right wing tip.
The investigation
SACAA AIID investigators examined the flight conditions and aircraft status. The investigation confirmed that the aircraft was within its maximum takeoff weight limits, with a total weight of 725.3kg against a maximum of 725.8kg. The pilot held a valid Commercial Pilot Licence and a Class 1 medical certificate. Maintenance records showed the aircraft's mandatory periodic inspection was current, and the Certificate of Airworthiness was valid.
Witness testimony from a local pilot noted that the day was characterized by high temperatures and strong westerly winds. The investigation noted that on hot, windy days, downdrafts are known to occur along the extended centerline of Runway 33. It was also observed that local pilots typically mitigate this risk by turning left into the wind toward lower ground.
Findings
- The primary cause of the incident was the aircraft's inability to climb out of a downdraft encountered after takeoff.
- The aircraft was operating within prescribed weight and balance limits.
- The pilot's decision to perform a precautionary landing prevented further escalation of the event.