Helikopter Service Flight 165 was a crash of a Sikorsky S-61 helicopter into the North Sea, 78 nautical miles (144 km; 90 mi) northwest of Bergen, Norway, on 26 June 1978. The aircraft was en route from Bergen Airport, Flesland to Statfjord A, an offshore oil platform. The accident was caused by a fatigue crack in a knuckle joint, causing one of the rotor blades to loosen. All eighteen people on board were killed in the crash.[1]

Helikopter Service Flight 165

A Helikopter Service's Sikorsky S-61 similar to the accident aircraft
Accident
Date	26 June 1978
Summary	Structural failure
Site	North Sea, Norway 61°01′N 002°48′E
Aircraft
Aircraft type	Sikorsky S-61
Operator	Helikopter Service
Registration	LN-OQS
Flight origin	Bergen Airport, Flesland, Bergen, Norway
Destination	Statfjord A, North Sea, Norway
Passengers	16
Crew	2
Fatalities	18
Survivors	0

References