Air carrier follows TCASII RA. Controller not aware of traffic until after the fact.

Attributes
ACN	445240
Time
Date	199908
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gso.airport
State Reference	NC
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gso.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : brook 2
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : gso.tracon
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 11400 flight time type : 3000
ASRS Report	445240
Person 2
Function	flight crew : first officer
Qualification	pilot : atp pilot : multi engine
ASRS Report	445829
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 2500 vertical : 300
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Over wallk intersection, on arrival (brook 2) into gso, got an RA on TCASII at approximately 11000 ft MSL during descent to 7000 ft. Light aircraft got within 300 ft vertical and 1/2 mi horizontal. We followed TCASII climb instructions and notified approach control of our actions. We gained approximately 1000 ft to 12000 ft. We visually picked up the traffic as it passed our right wing. The controller didn't pick up the traffic until we reported that we were 'TCAS climbing.' the tower chief later told me it was a VFR target heading wbound. Good save for the TCASII. Supplemental information from acn 445829: over wallk intersection, on brook 2 arrival into gso, got an RA on TCASII at approximately 11000 ft MSL. During descent to 7000 ft, light aircraft got within 300 ft vertical and 1/2 mi horizontal. We followed TCASII climb instructions and notified approach control of our actions. Climbed to approximately 12000 ft MSL, visually picked up traffic as it passed right wing. Controller didn't pick up the traffic until we reported that we were 'TCASII climbing.' tower chief later advised us it was VFR traffic wbound.

Original NASA ASRS Text

Title: ACR FOLLOWS TCASII RA. CTLR NOT AWARE OF TFC UNTIL AFTER THE FACT.

Narrative: OVER WALLK INTXN, ON ARR (BROOK 2) INTO GSO, GOT AN RA ON TCASII AT APPROX 11000 FT MSL DURING DSCNT TO 7000 FT. LIGHT ACFT GOT WITHIN 300 FT VERT AND 1/2 MI HORIZ. WE FOLLOWED TCASII CLB INSTRUCTIONS AND NOTIFIED APCH CTL OF OUR ACTIONS. WE GAINED APPROX 1000 FT TO 12000 FT. WE VISUALLY PICKED UP THE TFC AS IT PASSED OUR R WING. THE CTLR DIDN'T PICK UP THE TFC UNTIL WE RPTED THAT WE WERE 'TCAS CLBING.' THE TOWER CHIEF LATER TOLD ME IT WAS A VFR TARGET HDG WBOUND. GOOD SAVE FOR THE TCASII. SUPPLEMENTAL INFO FROM ACN 445829: OVER WALLK INTXN, ON BROOK 2 ARR INTO GSO, GOT AN RA ON TCASII AT APPROX 11000 FT MSL. DURING DSCNT TO 7000 FT, LIGHT ACFT GOT WITHIN 300 FT VERT AND 1/2 MI HORIZ. WE FOLLOWED TCASII CLB INSTRUCTIONS AND NOTIFIED APCH CTL OF OUR ACTIONS. CLBED TO APPROX 12000 FT MSL, VISUALLY PICKED UP TFC AS IT PASSED R WING. CTLR DIDN'T PICK UP THE TFC UNTIL WE RPTED THAT WE WERE 'TCASII CLBING.' TWR CHIEF LATER ADVISED US IT WAS VFR TFC WBOUND.

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.