The Globe and Mail newspaper in Toronto gained access to documents that showed "the S-92 couldn't meet a specification that calls for the main gearbox to run for half an hour without oil" in the event of a leak.
Yet certification documents filed with the Joint Aviation Authorities and seen by the newspaper show the U.S. Sikorsky company "demonstrated that a complete loss of gearbox oil was nearly impossible."
Early stages of the investigation into the Canadian crash indicate the craft experienced a sudden and complete loss of power and plunged into the Atlantic Ocean from about 900 feet while shuttling oil platform workers.
The only other known case of a total oil loss on an S-92 ocurred last summer when a helicopter in Australia made a forced landing that took 8 minutes, the newspaper said.
Sikorsky representatives told the newspaper they couldn't comment because the Canadian crash investigation is continuing.
Video of Victoria’s Secret models trying to 'twerk' hits Instagram
Wisconsin business offering 'therapeutic cuddling' forced to close