An air traffic controller reported that a VFR aircraft did not display on the radar display; and an ...

Attributes
ACN	1366414
Time
Date	201606
Local Time Of Day	1201-1800
Place
Locale Reference	RSW.TRACON
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	VFR
Person 1
Function	Supervisor / CIC
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 5
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict
Miss Distance	Horizontal 0 Vertical 800

Narrative:

I was working controller in charge. The controller was working east and south combined. We were in the process of changing runways. Aircraft X was our last departure off of runway 6 before we switched to runway 24. As I switched my map; I noticed a VFR target along the departure corridor at 10;500 feet. I asked east if they saw the traffic. At the time; east was in the process of switching aircraft X; but heard me and kept the aircraft. When I went over to the scope; the VFR target wasn't showing up with an altitude. It only showed 'rdr' [radar]. I told east the traffic was at 10;500 feet. Traffic was called. The controller told aircraft X to turn left 20 degrees. The pilot seemed to slowly turn. East had apreq (approval request) a higher altitude with ZMA to 15;000 feet to top the aircraft.as the two targets converged; aircraft X reported that he was responding to a RA. He then told us that target never showed up on his TCAS until the RA and he thought the controller was calling a different target. Closest proximity between the VFR aircraft and aircraft X was 0.2 miles and 0 feet.we need to discover why this target wasn't showing up properly on the radar scope and the pilot's TCAS; but it was showing up properly on the [map]. Controller should have given more of a drastic turn and possibly stopped aircraft X below the target until it was apparent the targets would miss.

Original NASA ASRS Text

Title: An Air Traffic Controller reported that a VFR aircraft did not display on the radar display; and an air carrier departure received an RA on the VFR target as the Controller was issuing a vector to avoid.

Narrative: I was working Controller In Charge. The controller was working East and South combined. We were in the process of changing runways. Aircraft X was our last departure off of runway 6 before we switched to runway 24. As I switched my map; I noticed a VFR target along the departure corridor at 10;500 feet. I asked East if they saw the traffic. At the time; East was in the process of switching Aircraft X; but heard me and kept the aircraft. When I went over to the scope; the VFR target wasn't showing up with an altitude. It only showed 'rdr' [radar]. I told East the traffic was at 10;500 feet. Traffic was called. The controller told Aircraft X to turn left 20 degrees. The pilot seemed to slowly turn. East had APREQ (Approval Request) a higher altitude with ZMA to 15;000 feet to top the aircraft.As the two targets converged; Aircraft X reported that he was responding to a RA. He then told us that target never showed up on his TCAS until the RA and he thought the controller was calling a different target. Closest proximity between the VFR aircraft and Aircraft X was 0.2 miles and 0 feet.We need to discover why this target wasn't showing up properly on the radar scope and the pilot's TCAS; but it was showing up properly on the [map]. Controller should have given more of a drastic turn and possibly stopped Aircraft X below the target until it was apparent the targets would miss.

Data retrieved from NASA's ASRS site 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.

An air traffic controller reported that a VFR aircraft did not display on the radar display; and an air carrier departure received an RA on the VFR target as the controller was issuing a vector to avoid.