The Westpac Rescue Helicopter flew the 29-year-old man to the John Hunter Hospital yesterday afternoon.
The man suffered pelvic and rib injuries when he was run over by a tractor on the property.
He was last reported to be in a stable condition.
The Westpac Rescue Helicopter is responding to a farming accident near Muswellbrook.
Emergency services were called to Davis Creek north east of town just after 2pm following reports a man has been run over by a large tractor.
Paramedics are currently on scene with the 29-year-old.
We'll have more details as they come to hand.
Image credit: Westpac Rescue Helicopter Service