A Londonderry man landed in hospital after a dusk motorcycle ride with mates along a fire trail at Londonderry on Sunday night.
Police, ambulance, rural fire service and CareFlight teams combined to locate, treat and transport the man after his friends called for help shortly after 8 pm.
When fire and police officers located the injured man off Devlin Road, ambulance paramedics called the CareFlight trauma team to assist with treatment.
The CareFlight doctor said that although the 24-year-old St Marys man sustained chest and pelvic injuries when he crashed while riding at an estimated 80 km/h, his helmet prevented head injuries.
The man was stabilised by the doctor and paramedics then taken in a road ambulance, under their continued treatment, to Westmead Hospital where he was in a stable condition on arrival.