Establishing the cause of a helicopter crash in the United States at the weekend that left two New Zealanders dead may take at least two weeks, says an air safety investigator.
Pilot James Innes and his son Andrew were killed instantly when their helicopter crashed near an airport at Price, in the state of Utah. An American man was also killed.
US air safety investigator Patrick Jones says he is looking at all factors, including the maintenance of the aircraft, which was quite new.
He will also look at any mechanical factors, the environment, the altitude, air temperature and load of the aircraft at the time of the crash.
James Innes helped to develop the technique of firing a net out of a gun to capture deer.