Helikopter Service Flight 165
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 A Helikopter Service Sikorsky S-61 similar to the accident aircraft | |
| Accident | |
|---|---|
| Date | 26 June 1978 |
| Summary | Structural failure |
| Site | |
 | |
| 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 |
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.
