Richard Kym Caskey, 64, and Michael Waldon, 60, were killed when their gyrocopter hit the ground in a field just south of Orange Regional Airport.

Mr Caskey, a father of two, is understood to have moved to Carcoar recently from the South Coast.

Mr Waldon, a father of three, was an accredited instructor with the Australian Sport Motorcraft Association.

Investigators returned to the crash scene on Thursday. 

Central West Police District crime manager Detective Inspector Bruce Grassick said they were still looking into communications from the flight to the aerodrome, service manuals and manufacturing details.

“It’s one of those investigations where if we find anything that will be of concern, we will certainly let people know,” he said. 

“As to why there’s two sites of wreckage is part of our investigations.”

Inspector Grassick said Mr Caskey had a number of hours’ experience in the aircraft and the pair had been practising manoeuvres for several days prior to the incident.