Flight crew of an medium large transport air carrier aircraft took evasive action upon sighting an aircraft below their assigned altitude doing aerobatic maneuvers.

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Attributes
ACN	251650
Time
Date	199309
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 5000 msl bound upper : 5200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	climbout : intermediate altitude descent other other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 7500 flight time type : 830
ASRS Report	251650
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : far other anomaly other
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 900
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Being vectored for visual approach runway 13R dfw, level at 5000 ft in dfw TCA (at floor). Saw traffic 12 O'clock, 2 mi low. Small aircraft biplane doing acrobatics, passed under us by 1000 ft or less. We deviated right and climbed 200 ft to avoid. Hard to know where to go to avoid aircraft doing aerobatics. No advisory from ATC. No advisory from TCASII. Presumably, no transponder aircraft. I believe one is required in this airspace. We were 22 NM from dfw. This may be a legal place to perform aerobatics per current FARS, but it shouldn't be. Didn't know for sure that he wouldn't climb into us as we passed over him.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT TOOK EVASIVE ACTION UPON SIGHTING AN ACFT BELOW THEIR ASSIGNED ALT DOING AEROBATIC MANEUVERS.

Narrative: BEING VECTORED FOR VISUAL APCH RWY 13R DFW, LEVEL AT 5000 FT IN DFW TCA (AT FLOOR). SAW TFC 12 O'CLOCK, 2 MI LOW. SMA BIPLANE DOING ACROBATICS, PASSED UNDER US BY 1000 FT OR LESS. WE DEVIATED R AND CLBED 200 FT TO AVOID. HARD TO KNOW WHERE TO GO TO AVOID ACFT DOING AEROBATICS. NO ADVISORY FROM ATC. NO ADVISORY FROM TCASII. PRESUMABLY, NO XPONDER ACFT. I BELIEVE ONE IS REQUIRED IN THIS AIRSPACE. WE WERE 22 NM FROM DFW. THIS MAY BE A LEGAL PLACE TO PERFORM AEROBATICS PER CURRENT FARS, BUT IT SHOULDN'T BE. DIDN'T KNOW FOR SURE THAT HE WOULDN'T CLB INTO US AS WE PASSED OVER HIM.

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.