Accident Overview
On 25 September 2014, at approximately 1105Z, a Robinson R44 Raven II helicopter (registration ZS-OFJ) crashed in the Jupiter industrial area near Germiston, Gauteng Province. The helicopter was destroyed by a post-impact fire. Both occupants—the pilot and a passenger—sustained fatal injuries.
Flight History
The helicopter, operating a commercial vehicle tracking flight, had departed from Rand Airport (FAGM) and was returning from the Pretoria area. The pilot, who was on her first job assignment with a new employer, contacted FAGM Approach Control (ATC) while approaching from the north. She reported her position at about five nautical miles north of FAGM and requested to join the circuit and land at the heliport near Hangar 6. The ATC cleared the flight inbound at 6000 ft AMSL and instructed it to remain north of Runway 29, as a Cessna 150 was conducting left circuit training. The pilot acknowledged the instructions.
Approximately two minutes later, the pilot reported ready to cross Runway 29. The ATC denied permission and reiterated the instruction to remain north. The ATC then located the helicopter hovering over factories in the industrial area at about one nautical mile north of the airport. Observing the helicopter maneuvering strangely—suddenly pitching nose-up then nose-down—the ATC contacted the pilot. The pilot responded with a "MAYDAY" emergency call. In the background of the ATC recording, a low main rotor RPM horn warning was audible. Witnesses reported seeing the helicopter descend nose-down with a high-revving engine sound before impacting the ground and bursting into flames.
Injuries and Damage
The accident resulted in two fatalities: the pilot and the passenger. No other injuries were reported. The helicopter was destroyed by the post-impact fuel-fed fire. Main rotor, tail rotor, and vertical stabilizer components were found within a 40-meter radius of the main wreckage.
Aircraft and Pilot Information
The aircraft was a Robinson R44 Raven II (serial number 11147) manufactured in 2006, equipped with a Lycoming IO-540-AE1A5 engine. At the time of the accident, the helicopter had accumulated 7732.2 total airframe hours. The most recent maintenance (MPI) was performed on 22 September 2014 at 7720.2 hours. Weight and balance calculations indicated the helicopter was within limits.
The 30-year-old female pilot held a valid Commercial Helicopter Licence with a total flying experience of 226.6 hours, of which 98.7 hours were on the R44 type. She had obtained her commercial licence on 28 August 2014, just over a month before the accident. This flight was her first day on the job with her new employer.
Probable Cause
The investigation determined that the helicopter entered a vortex ring state from which the pilot was unable to recover. Contributing factors included sudden hovering out-of-ground effect at a restricted height, situational unawareness, and loss of control.