S80 responds to TCASII RA.

Attributes
ACN	439414
Time
Date	199906
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : glenrose arrival
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Operator	general aviation : personal
Make Model Name	Experimental
Operating Under FAR Part	Part 91
Flight Phase	cruise : level cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	439414
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical conflict : nmac other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action flight crew : took evasive action flight crew : returned to original clearance
Miss Distance	horizontal : 9000 vertical : 400
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Z time: XX50Z. Altitude: 11000 ft. ATC facility: regional approach. Location: jen/039 degrees 26 NM. While on the glen rose arrival at hirst intersection at 11000 ft altitude we were commanded climb by TCASII to climb, climb now. First officer flying started climb and I asked for right turn immediately. Shortly thereafter I saw aircraft. It was a home built low wing black or dark blue with white scallops, bubble canopy, tail dragger. I think it is an rv 4 type aircraft. This aircraft was 400 ft below and directly off our nose. I believe he was performing acrobatics, but definitely not maintaining VFR. Aircraft was not maintaining VFR cloud separation. We climbed 800 ft and turned 20 degrees right of course with top of climb approximately 12000 ft which was 1000 ft off assigned altitude. 2 other aircraft behind us on the arrival also reported this aircraft on their TCASII as a conflict, and I can identify this aircraft if needed. I had a very good look at it. Our estimate of closest point was 400 ft vertical and 1.5 mi horizontally.

Original NASA ASRS Text

Title: S80 RESPONDS TO TCASII RA.

Narrative: Z TIME: XX50Z. ALT: 11000 FT. ATC FACILITY: REGIONAL APCH. LOCATION: JEN/039 DEGS 26 NM. WHILE ON THE GLEN ROSE ARR AT HIRST INTXN AT 11000 FT ALT WE WERE COMMANDED CLB BY TCASII TO CLB, CLB NOW. FO FLYING STARTED CLB AND I ASKED FOR R TURN IMMEDIATELY. SHORTLY THEREAFTER I SAW ACFT. IT WAS A HOME BUILT LOW WING BLACK OR DARK BLUE WITH WHITE SCALLOPS, BUBBLE CANOPY, TAIL DRAGGER. I THINK IT IS AN RV 4 TYPE ACFT. THIS ACFT WAS 400 FT BELOW AND DIRECTLY OFF OUR NOSE. I BELIEVE HE WAS PERFORMING ACROBATICS, BUT DEFINITELY NOT MAINTAINING VFR. ACFT WAS NOT MAINTAINING VFR CLOUD SEPARATION. WE CLBED 800 FT AND TURNED 20 DEGS R OF COURSE WITH TOP OF CLB APPROX 12000 FT WHICH WAS 1000 FT OFF ASSIGNED ALT. 2 OTHER ACFT BEHIND US ON THE ARR ALSO RPTED THIS ACFT ON THEIR TCASII AS A CONFLICT, AND I CAN IDENT THIS ACFT IF NEEDED. I HAD A VERY GOOD LOOK AT IT. OUR ESTIMATE OF CLOSEST POINT WAS 400 FT VERT AND 1.5 MI HORIZLY.

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.