Last night around 2 AM, the person was noticed by security personnel while he was trying to trespass into the premises of the critical IAF installation, they said.
Sonu, a resident of Loni area here, was caught by a personnel, but he thrashed the personnel before disappearing into the dense jungle inside the air base, police said.
An alarm was then raised and the local police was informed and after combing operation the trespasser was nabbed, police said.
Assistant Superintendent of Police Asheesh Srivastav said two days ago Delhi Police had arrested a couple of Jaish-e-Mohammed terror suspects.
Senior Superintendent of Police Dharmendra Singh told reporters the intruder "seems to be mentally retarded".
Defence security agencies handed him over to Sahibabad Police this evening after detailed interrogation.