A Rural Fire Service volunteer was flown to Westmead Hospital after falling five metres down a cliff during a hazard reduction burn at Leura last night.
Emergency services workers were called to Prince Henry Cliff Walk in Leura about 8.45pm on October 24 following the incident.
"An ambulance helicopter landed at Peter Carroll Park at Leura but due to concerns the down draft would cause the fire to reignite it was unable to be used to rescue the firefighter," police said in a statement.
Police Rescue officers and paramedics were forced to carry the firefighter by stretcher for 45 minutes after walking to the scene. He was then transported by ambulance before being flown to Westmead Hospital.
Reports on Facebook said the man suffered only minor injuries despite the fall.