Accident Investigation Bureau (AIB) was notified of the accident by the Nigerian Civil Aviation Authority (NCAA) at about 16:15hrs on 12th of August, 2015. Investigators were dispatched to Oworonsoki area of Lagos immediately. All relevant authorities were notified.
5N-BGD departed SEDCO Express oil rig at about 14:55hrs on 12th August, 2015 with 12 persons on board including two crewmembers and an endurance of one hour and thirty minutes maintaining 3,000 ft. The estimated arrival at Murtala Muhammed Airport (DNMM), Lagos was 15:36hrs according to the crew information before departure from the rig.
At about 15:31hrs, 5N-BGD, Sikorsky S-76C+, a domestic charter flight operated by Bristow Helicopters (Nig.) Limited, crashed into the Lagoon at Oworonsoki area of Lagos. Visual meteorological conditions prevailed at the time and a VFR flight plan was filed.
The helicopter experienced sudden uncommanded pitch up, yaw, and roll for about 12 seconds until it impacted water at about 15:31hrs. The pilots were neither able to make any form of distress call to ATC, SEDCO Express rig nor communicate with the passengers before impact.
Rescue Operation was swift, prompt and carried out by local fishermen who were in the area. There were six fatalities, including two crew members and six seriously injured passengers. The crew members were recovered the following day.
The helicopter was destroyed but there was no post-impact fire.