Sikorsky S-92A crash near St Johns, Newfoundland, Canada

Cougar Helicopters Flight 91, a Sikorsky S-92A carrying oil platform workers from St. John's International Airport to the SeaRose FPSO and Hibernia Platform in the offshore oilfields, ditched into the Atlantic Ocean 55km east-southeast of St. John's, Newfoundland. At 9:40 a.m. the crew reported zero oil pressure in the main gearbox and issued a mayday. Eight minutes later the helicopter went down. Of 18 on board, 17 were killed and one passenger survived with serious injuries. All victims died of drowning. The TSB investigation found a broken titanium stud in the gearbox oil filter assembly caused total oil loss. The S-92A had previously failed a 30-minute run-dry test during certification, failing after 10 minutes. Sikorsky had issued an alert service bulletin in January 2009 following a similar incident in Australia, but the stud had not yet been replaced on the accident aircraft. The TSB identified 16 contributing factors. Cougar and families later sued Sikorsky, with both cases settled out of court.