Emergency services visited the Illawarra mountain biking haunt Possums twice on Monday - a date once earmarked for the demolition of the rider-made dirt jumps that make the site so popular.
NSW Ambulance paramedics were called about 3pm Monday to the Balgownie bushland track after a man aged 45 reportedly rode off a two-metre jump and hit a tree at speed.
The Mercury understands the man's children were looking on as he came unstuck and lost consciousness. He regained consciousness by the time medicos including a specialist operations paramedic reached him to assess him for a head injury.
A Toll rescue helicopter landed at nearby Judy Masters Oval and was on standby for about two hours before the man could be carried out and a decision was made to fly him to St George Hospital, said NSW Ambulance's chief inspector Norm Rees.
"When it was established he'd lost consciousness for five minutes; that's a concern," Insp Rees said.
A NSW Fire and Rescue walking party helped paramedics carry out the man using a mule - a wheel-mounted caged Stokes Litter.
The emergency was the second at Possums on Monday. About 9.55am crews were called in for a 13-year-old boy who also came unstuck on a jump. He was assessed and treated for leg, arm and facial injuries. He was transported by road ambulance to Wollongong Hospital.
A 19-year-old male rider also suffered a significant facial injury at the site on Sunday. He was taken by road ambulance to Wollongong Hospital.
All three injured riders were wearing helmets.
The recent emergencies come after National Parks and Wildlife flagged plans to remove jumps at the site. Earlier this month, an NPWS spokesman told the Mercury the works were due to safety concerns and were to begin today - June 14
"The jumps are illegal and cause environmental impacts and safety issues in the Illawarra Escarpment State Conservation Area, and also affect surrounding private property," a spokesperson said at the time.
The plans were put on hold after members of the local mountain biking community voiced their outrage and Keira MP Ryan Park brokered a stay of execution to allow for talks between riders and the department.