Large transport flight crew has TCASII RA but ATC reports no traffic in the area. Another aircraft following says they sighted an aircraft doing aerobatics in front of them. Unk VFR traffic in area. TCASII RA.

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Attributes
ACN	338843
Time
Date	199606
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 11000 msl bound upper : 14000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 500
ASRS Report	338843
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other other : unspecified
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 5000 vertical : 200
Supplementary
Air Traffic Incident	other

Narrative:

During climb out from atl while on radar vectors (065 degrees) climbing to FL230, at 11000 ft TCASII gave TA followed immediately by RA 'climb, climb.' autoplt was turned off and climb increased to 4000 FPM. Traffic passed 200 ft below us, within 1 mi. At 14000 ft warning stopped. When asked, ATC said that they had no reported traffic. An aircraft climbing behind us reported an aircraft in front of him doing aerobatics. We suspect that this was our RA conflict. We never had visual contact with traffic.

Original NASA ASRS Text

Title: LGT FLC HAS TCASII RA BUT ATC RPTS NO TFC IN THE AREA. ANOTHER ACFT FOLLOWING SAYS THEY SIGHTED AN ACFT DOING AEROBATICS IN FRONT OF THEM. UNK VFR TFC IN AREA. TCASII RA.

Narrative: DURING CLBOUT FROM ATL WHILE ON RADAR VECTORS (065 DEGS) CLBING TO FL230, AT 11000 FT TCASII GAVE TA FOLLOWED IMMEDIATELY BY RA 'CLB, CLB.' AUTOPLT WAS TURNED OFF AND CLB INCREASED TO 4000 FPM. TFC PASSED 200 FT BELOW US, WITHIN 1 MI. AT 14000 FT WARNING STOPPED. WHEN ASKED, ATC SAID THAT THEY HAD NO RPTED TFC. AN ACFT CLBING BEHIND US RPTED AN ACFT IN FRONT OF HIM DOING AEROBATICS. WE SUSPECT THAT THIS WAS OUR RA CONFLICT. WE NEVER HAD VISUAL CONTACT WITH TFC.

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.