Investigators say there were no mechanical problems reported before a helicopter, piloted by a Scottish billionaire, crashed off Little Deer Isle earlier this month.That’s according to a preliminary report by the National Transportation Safety Board.Irvine Laidlaw is a member of Britain’s house of lords. He was piloting the chopper at the time of the crashThe report says Laidlaw was carrying three passengers. They had either just taken off or were trying to land on Laidlaw’s private yacht, “The Lady Christine.”The helicopter was flying about 400 feet up when it began to lose altitude. Laidlaw deployed emergency flotation devices before hitting the water.No one was seriously hurt.The N.T.S.B. says it could take up to another year before the cause of the crash is released.