The Accident Investigation Bureau was notified of the serious incident on the 16th of April 2010 by the Nigerian Civil Aviation Authority (NCAA). Other relevant authorities and stake holders were also notified. An Investigator was dispatched to the site of the incident on 17th of April 2010.
On 16th April, 2010 at 0748hrs, a Bell 412-EP Helicopter, with registration 5N-BFU, operated by Bristow/PAAN was on a charter flight from Warri Terminal (WT) to Funiwa with eight passengers on board. The Captain was the Pilot Flying.
On a second flight from Warri at 0946hrs, 5 to 10 minutes into the flight to Abiteye, the crew noticed an abnormal torque split indication and oscillation on engine #2 torque needles. Two tests were carried out to confirm the torque split indication but the indication was not replicated.
During the second test flight there was a loud noise and severe vibration; the pilot noticed engine power loss indication and entered autorotation. The Captain selected a landing area in view while the co-pilot declared MAYDAY. The aircraft landed safely at the NNPC Housing Complex field. There were no injuries to persons on board the aircraft as the autorotation was successfully accomplished.