Man trapped under tractor

A man is being flown to Royal Perth Hospital after he became trapped under a tractor at Coolup, near Waroona.

Emergency services were called to the Mayfield Road property, about 90km south of Perth, about 10.10am.

It is understood the man's leg was trapped between the tractor and a wall on the property.

Career firefighters from Mandurah and volunteer fire and rescue service firefighters from Pinjarra and Waroona helped free the man.

The RAC Rescue chopper is transporting the man to Royal Perth Hospital for treatment.

He is expected to arrive in Perth just after midday.