PA-32 Cherokee Six/Lance/Saratoga/6X
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 14
Distraction; Confusion; Human-Machine Interface; Troubleshooting; Situational Awareness
ATC Issue All Types; Conflict NMAC
Aircraft; ATC Equipment / Nav Facility / Buildings
Aircraft X was an overflight at 6000' and reported a NMAC with a VFR aircraft orbiting 35nm North of STL at 6000'. At the time the STL ASR & Mode S was Out to Maintenance (OTM). The VFR aircraft in question Mode C was constantly fluctuating.Constantly call traffic regardless of reported Mode C.
Saint Louis TRACON Controller reported that the Saint Louis ASR and Mode S was released to maintenance. An aircraft reported a Near Mid Air Collision with a VFR aircraft whose Mode C was fluctuating.