Sikorsky S-6IN G-BEID
Encyclopedia
G-BEID was a Sikorsky S-61N
Sikorsky S-61
The Sikorsky S-61L and S-61N are civil variants of the successful SH-3 Sea King helicopter. They are two of the most widely used airliner and oil rig support helicopters built.-Design and development:...

 helicopter of British International Helicopters
British International Helicopters
British International Helicopter Services Limited is an airline based at Penzance heliport, in Cornwall, England, United Kingdom, with headquarters located at Sherborne, Dorset. It operates seasonal and year round domestic scheduled services to the Isles of Scilly. Its main base is Penzance...

 which made a controlled ditching in the sea 29 nmi (53.7 km) northeast of Sumburgh
Sumburgh
Sumburgh may refer to various places near the southern extremity of mainland Shetland in Scotland:* Sumburgh Head, a headland* Sumburgh Airport, the islands' main air terminal* Sumburgh, Shetland, a small settlement...

 on 13 July 1988 following an engine fire. There were no fatalities.

Accident

The helicopter left the Safe Felicia semi-submersible
Semi-submersible
A semi-submersible is a specialised marine vessel with good stability and seakeeping characteristics. The semi-submersible vessel design is commonly used in a number of specific offshore roles such as for offshore drilling rigs, safety vessels, oil production platforms and heavy lift cranes.The...

 oil rig in the Forties oilfield
Forties oilfield
The Forties Oil Field is the largest oil field in the North Sea, 110 miles east of Aberdeen. It was discovered in 1970 and first produced oil in 1975 under ownership of BP.-History:...

 at 13:45 with 2 pilots and a full load of 19 passengers for the one hour flight to Sumburgh Airport
Sumburgh Airport
-Other tenants:*Maritime and Coastguard Agency *Bristow Helicopters*Bond Helicopters -Incidents and accidents:...

 on the Mainland of Shetland.

At 14:28 the co-pilot (who was flying) reported hearing a muffled bang which was also heard by some of the passengers, from the area of the No. 2 engine transmission. Shortly after, the No. 2 engine's fire warning lights came on. The pilot immediately began a descent and transmitted a distress call.

About 48 seconds after the noise, the No. 2 engine was shut down and the fire extinguisher triggered. The No. 1 engine fire warning then also illuminated, while passengers saw oil leaking from the cabin ceiling.

The pilot advised the passengers to prepare for an emergency ditching and took control of the aircraft. The floats were deployed and a gentle ditching was made about 3 minutes after the initial noise had been heard, by which time the helicopter's cabin had filled with smoke. All 21 occupants evacuated on to liferafts and were then winched up into a Search and Rescue helicopter. After a strong fire consumed most of the floating helicopter, the remains broke up and sank.

Investigation

A recovery operation was mounted using the DSV (diving support vessel
Diving support vessel
A diving support vessel is a ship that is used as a floating base for professional diving projects.Commercial Diving Support Vessels emerged during the 1960s and 1970s when the need arose for diving operations to be performed below and around oil production platforms and associated installations in...

) Stena Marianos which arrived on site on 16 July 1988. The aft fuselage section was raised the following day and the forward section shortly after. The recovery operation had to be ended on 19 July before finding the engines or transmission components due to the Stena Marianos having other commitments.

The recovery continued on 2 August using the DSV Norskald, and the engines, main rotor, and transmission were located and raised on 5 August.

Cause

It was concluded that the fire had occurred in the helicopter's main gearbox, probably resulting from the effects of a bearing failure in the No. 2 engine. A further factor was the lack of fire detection or suppression capability within the gearbox bay. The cause of the bearing failure could not be definitely established.

Safety Recommendations

The AAIB made a list of 27 safety recommendations to the CAA. These addressed improvements in maintenance, early detection of problems, emergency escape equipment, documention and training provisions, and firewall integrity. Most of these were accepted by the CAA.
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