TRACON controller observes uncontrolled aircraft maneuvering in the vicinity of the cvg runway 18 final approach course and takes action to provide separation from unidented VFR mode C aircraft. Controller perceives airport traffic volume justifies airspace reorganization.

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Attributes
ACN	424462
Time
Date	199812
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 1500 msl bound upper : 1800
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	government : faa
Function	controller : approach
ASRS Report	424462
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 0
Supplementary
Air Traffic Incident	other

Narrative:

While working lce airspace, a VFR target Y was observed between and on the finals to runways 18R/left. The mode C readout was intermittent and was unable to be verified. Traffic was issued to the aircraft on final. This is a problem that occurs on a regular basis at cvg. With the volume of traffic arriving at this airport on this particular inbound push, a VFR aircraft flying around on the finals, while not in communications with the controling facility, is a safety factor and concern. While we are unable to know exactly what the VFR aircraft is going to do, we have to protect for simultaneous approachs, and now for an aviator not talking to the controller that is running approximately 72 aircraft per hour, over top or under him/her. This aircraft's mode C read 1500-1800 ft MSL when it was working. We were unable to ensure this was accurate, so therefore had to protect. I believe the implementation of class B airspace would resolve this safety factor.

Original NASA ASRS Text

Title: TRACON CTLR OBSERVES UNCTLED ACFT MANEUVERING IN THE VICINITY OF THE CVG RWY 18 FINAL APCH COURSE AND TAKES ACTION TO PROVIDE SEPARATION FROM UNIDENTED VFR MODE C ACFT. CTLR PERCEIVES ARPT TFC VOLUME JUSTIFIES AIRSPACE REORGANIZATION.

Narrative: WHILE WORKING LCE AIRSPACE, A VFR TARGET Y WAS OBSERVED BTWN AND ON THE FINALS TO RWYS 18R/L. THE MODE C READOUT WAS INTERMITTENT AND WAS UNABLE TO BE VERIFIED. TFC WAS ISSUED TO THE ACFT ON FINAL. THIS IS A PROB THAT OCCURS ON A REGULAR BASIS AT CVG. WITH THE VOLUME OF TFC ARRIVING AT THIS ARPT ON THIS PARTICULAR INBOUND PUSH, A VFR ACFT FLYING AROUND ON THE FINALS, WHILE NOT IN COMS WITH THE CTLING FACILITY, IS A SAFETY FACTOR AND CONCERN. WHILE WE ARE UNABLE TO KNOW EXACTLY WHAT THE VFR ACFT IS GOING TO DO, WE HAVE TO PROTECT FOR SIMULTANEOUS APCHS, AND NOW FOR AN AVIATOR NOT TALKING TO THE CTLR THAT IS RUNNING APPROX 72 ACFT PER HR, OVER TOP OR UNDER HIM/HER. THIS ACFT'S MODE C READ 1500-1800 FT MSL WHEN IT WAS WORKING. WE WERE UNABLE TO ENSURE THIS WAS ACCURATE, SO THEREFORE HAD TO PROTECT. I BELIEVE THE IMPLEMENTATION OF CLASS B AIRSPACE WOULD RESOLVE THIS SAFETY FACTOR.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.