Police are appealing for public assistance to locate a Summerhill man not sighted since Sunday morning.
Paul Douglas Warmsley is described as Caucasian, 183 centimetres tall with a heavy build, blue eyes, shaved fair hair, a grey goatee beard and a distinctive scorpion tattoo on his neck.
The 51 year old was last seen walking in the Summerhill area at about 10:30am Sunday, wearing a blue checked flannelette shirt and grey track pants.
The rescue helicopter is being used on Wednesday to conduct an aerial search in the Duck Reach and Cataract Gorge area.
Any information as to the whereabouts of Mr Warmsley can be provided to police on 131 444 or Crime Stoppers on 1800 333 000.