UPDATE: A MAN who became trapped in firefighting equipment north of Beaufort this morning is believed to have had his leg amputated.

WorkSafe officers have arrived at the scene on Raglan-Elmhurst Rd about 45km east of Ararat.

It is believed the man, 51, was assisting with back-burning operations when the accident happened late this morning.

A State Control Centre spokesman said the man, who is a contractor, was working with machinery on the Glenlogie fire this morning.

A WorkSafe spokesman told Weekly Times Now the man wasn't driving the CMC firefighting equipment.

The machine is said to look like a dozer.

"He wasn't driving it and it's believed he got his legs tangled up in the track," the spokesman said.

The man sustained serious injuries to both his legs.

An Ambulance Victoria spokeswoman said the Air Ambulance was flying the man to The Alfred hospital in Melbourne for treatment.

The man is in a critical but stable condition in hospital.