The men were injured when the rural fire service truck they were in crashed into a pole on Berrima Road, Moss Vale, about 5.40pm.

Two other men received minor cuts and abrasions and were taken to Bowral Hospital.

The crew had been responding to a fire in the area. 

Mittagong Rural Fire superintendent Martin Surrey said the two men who were flown to hospital had suffered broken bones and head wounds but were recovering well.

He thanked the community for their well wishes shared on social media.

Police are investigating the cause of the crash.