What happened
On the evening of 15 September 2014, a Cessna C172 aircraft, registration ZS-IFK, was performing a night-time cross-country flight under visual flight rules. The flight was part of a series of legs intended to build pilot hours, traveling from Newcastle Aerodrome toward Rand Aerodrome. After refueling at Newcastle, the aircraft departed at approximately 1755Z.
At 1-805Z, air traffic services radar at OR Tambo identified the aircraft at an altitude of 5,000 feet. Shortly after being spotted, the aircraft initiated a right-hand turn. During this maneuver, the aircraft's airspeed increased and its rate of descent accelerated, leading to it disappearing from radar surveillance. The wreckage was subsequently discovered on a private farm roughly 8.3 nautical miles northwest of Newcastle Aerodrome. The impact and a subsequent intense fuel-fed fire resulted in 2 fatalities.
The investigation
Investigators from the SACAA AIID examined the wreckage and the circumstances surrounding the flight. The aircraft was found to have struck the ground in a nose-down attitude while still under power. The force of the impact was severe enough to shatter the landing gear, detach the engine, and cause the right wing to separate from the fuselage. The intensity of the post-impact fire, fueled by the aircraft's fuel cells, destroyed most of the airframe and consumed the pilot's logbook.
Technical examination of the engine and propeller indicated that the engine was producing power immediately prior to the collision. The investigation also noted that the aircraft was not equipped with flight data or cockpit voice recorders, as they were not required for this aircraft type. Meteorological data at the time showed mid-level clouds in the area and a temperature of 32°C.
Findings
- The primary cause of the accident was spatial disorientation experienced by the pilot.
- The pilot likely suffered from visual illusions caused by limited terrestrial lighting and a lack of clear visual references during the night flight.
- The aircraft's descent and subsequent loss of control during the turn suggest a possible transition into a graveyard spiral, where the pilot's perception of the aircraft's attitude conflicted with its actual flight path.
- The high-energy impact and subsequent fire were the direct causes of the destruction of the aircraft and the deaths of both occupants.