What happened
On 10 August 2002, a ZLIN Z-50LA, registered as ZS-MBL, was conducting a private flight from Virginia aerodrome toward the Durban General Flying Training Area. The aircraft departed Virginia aerodrome at 0826Z and passed the Umhlanga lagoon shortly thereafter.
At approximately 0830Z, the aircraft was observed flying north at an altitude of roughly 250 ft AMSL, positioned about 400m from the shoreline in a wings-level attitude. According to eyewitness accounts, the aircraft suddenly entered a sharp bank. This maneuver transitioned into a continuous roll as the nose dropped below the horizon, resulting in a near-vertical descent. The aircraft struck the sea at a vertical, nose-down angle. Following the impact, the aircraft sank rapidly. The pilot, an Airline Transport Pilot with over 13,000 flying hours, sustained fatal injuries.
The investigation
Investigators examined the wreckage and interviewed several witnesses at the Umdloti area. While eyewitness accounts regarding the direction of the initial bank (left versus right) and the pilot's control inputs (attempting to pull out of or push out of the dive) were inconsistent, all observers agreed that the engine sounded normal during the sequence of events.
Physical evidence recovered by police divers the following day included portions of the aircraft wreckage. The investigation also included a post-mortem examination and blood analysis of the pilot. The medical findings indicated no pre-existing medical conditions that would have contributed to the accident. The cause of death was identified as head and multiple injuries, though drowning remained a possibility.
Findings
- The aircraft was within its maintenance interval, having flown only 52.7 airframe hours since its last MPI.
- There was no evidence of engine failure, as the engine sounded normal to witnesses throughout the event.
- The specific cause of the sudden nose-down attitude and subsequent dive was not determined.