Light Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 10
Distraction; Situational Awareness
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance; Flight Crew Regained Aircraft Control; Flight Crew Requested ATC Assistance / Clarification
Human Factors; Procedure
Aircraft X; cleared Visual Approach  off a downwind turn behind a Heavy. Aircraft X was pointed away and behind Heavy when cleared to follow the traffic and issued caution wake turbulence. The pilot turned to follow the Heavy at his discretion towards the traffic and the field to a dog leg at about 5.5 miles in trail of the Heavy. Aircraft X joined final approach behind the traffic and I; the Final Radar Controller; observed what looked like a quick radar track anomaly. Quickly followed was an observed turn and quick descent and climb by Aircraft X back towards the field. The pilot promptly advised of a 'complete upset' and that he was back on the turn towards the traffic and on the Visual Approach with out a chance for me to issue any instructions.Later to find out this verbiage meant the aircraft had been sent into a complete roll to the right in which the pilot continued to recover the aircraft. No official cause but I can only guess wake turbulence from the Heavy traffic sent him into an uncontrolled roll. I acknowledged; inquired if any assistance was required to which the pilot responded in the negative; and I continued to work the traffic to include breaking out a Heavy behind him to allow him to continue the Visual Approach. The aircraft continued on the approach and double confirmed that everything was okay and no assistance was required before sending him to the Tower for landing.No recommendation; but awareness for all pilots of potential wake turbulence induced events. I personally could have ensured the aircraft was at a higher altitude to possibly prevent the wake trajectory; but I was originally setting up Aircraft X for an ILS Approach to follow at the appropriate  wake turbulence minimums. Only after the pilot called traffic and field in sight was he given the Visual Approach clearance to follow. If the pilot did not feel comfortable with this; I did not know or could have recommended a different method of approach.
A TRACON Controller reported a twin prop aircraft temporarily lost control when it was cleared for a Visual Approach and turned final behind a Heavy and encountered wake turbulence.