Too early to tell gyrocopter crash cause

Crash investigators say it is too early to tell what caused a gyrocopter to fall from the sky and crash into a paddock on the NSW south coast.

A member of the public called police on Sunday morning after the gyrocopter came down while flying over a dairy farm at Brundee, near Nowra.

The 65-year-old pilot from Nowra, the sole occupant, died at the scene.

Nowra Police inspector John Behrendt said witnesses told police the gyrocopter hit the ground hard.

"There were people on the road and the owners of property across the road saw the aircraft come down," he told ABC radio.

Gyrocopters are popular for recreational flying but are also used for mustering on farms.

Two inspectors from the Australian Sports Rotorcraft Association (ASRA) have been sent to the scene to help with the investigation.

ASRA president Paul Campbell said there was no reason to believe the gyrocopter was being used for mustering.

Mr Campbell told AAP it was too early to say what caused the crash.

"Gyrocopters are very safe in regards to their design and construction," he said.

"There has not been any common thread why accidents have happened in the past."

The Australian Transport Safety Bureau has been notified about the crash but ASRA carries out investigations into gyrocopter crashes.