What happened
On 31 March 2012, a Jihlavan KP5-ASA departed from Tedderfield Airpark for a scheduled training flight. The aircraft, registration ZU-EUT, was being operated by MT Naval Trading 509CC for the purpose of dual instruction. Approximately ten minutes into the flight, while operating in the Poort and Gauteng area, the engine lost power.
In an attempt to avoid residential structures within the Poortje informal settlement, the pilot attempted a right-hand turn and pitched the aircraft up. During this sequence, the aircraft's wing struck a black wattle tree, and the tail assembly made contact with high-tension electrical conductors. The aircraft then struck a parked vehicle before ultimately crashing into the ground near a house. The impact was severe, resulting in two fatalities for the occupants of the aircraft.
The investigation
SACAA AIID investigators examined the wreckage and the environmental conditions at the time of the accident. The investigation confirmed that the aircraft was properly maintained and that the pilot held a valid commercial license. Witnesses at the scene observed the aircraft flying at a very low altitude, exhibiting pitching and yawing motions consistent with a stall or near-stall condition.
Technical analysis of the engine and propeller showed that the engine was not producing power at the time of impact. The investigation also reviewed meteorological data, specifically the relationship between the ambient temperature of 12°C and the dew point of 10°C.
Findings
- The primary cause of the engine failure was carburettor icing.
- Atmospheric conditions presented a serious probability of icing at any power setting.
- The pilot lost control of the aircraft after the wing clipped a tree during the emergency maneuver.
- A successful forced landing was impossible due to the confined space and high density of structures within the built-up area.