Flight Crew Instrument; Flight Crew Commercial
Flight Crew Last 90 Days 35; Flight Crew Total 6715; Flight Crew Type 350
Workload; Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC
Flight Crew Requested ATC Assistance / Clarification
Procedure; ATC Equipment / Nav Facility / Buildings
While at cruise at 2;200 MSL with Toledo Approach providing VFR traffic advisories; we had a [low wing] private plane pass under us at less than 200 feet separation. No indication that the Piper saw us as they did not deviate from flight path. Upon query to approach control; they said they had a 'ghost' showing in that area; but the signal was faint and they were not sure if it was an echo of our signal. Completed mission without further incident.
A VFR Helicopter pilot at 2;200 feet with TOL ATC traffic advisories reported a near miss after a single engine aircraft passed 200 feet beneath him without an ATC advisory. ATC reported a faint 'ghost' target.