The Civil Aviation Authority (CAA) is warning "loose items" on helicopters can be deadly as investigators probe whether a pair of overalls contributed to the helicopter triple fatality in Wanaka last month.
The CAA issued the safety message today after the Herald quoted sources saying loose clothing was being investigated as a possible cause of the October 18 crash in Wanaka.
Pilot Nick Wallis and Department of Conservation rangers Paul Hondelink and Scott Theobald were killed in the crash.
It is believed the occupants of a trailing helicopter belonging to another local firm who were leaving from Wanaka Airport on the same tahr cull operation, saw clothing being sucked out of the machine and wrapping around the tail rotor.
The CAA's safety warning titled "loose items can be fatal", posted on its website today, said analysis of helicopter occurrence data "has identified a number of accidents and incidents where loose items in the cabin have exited the helicopter and contacted the tail rotor".