MD80 first officer stopped descent and climbed in response to a TCASII RA.

Attributes
ACN	532099
Time
Date	200112
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : jen.vortac
State Reference	TX
Environment
Light	Night
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 : vacating altitude descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	532099
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Descending through 13000 ft, we received a TCASII alert TA. Received TCASII RA at 12700 ft. Descending, first officer smoothly responded to the RA from a 2000 FPM descent to a 2000 FPM climb, resulting in VFR target passing 400 ft below. TA terminated at 13200 ft, and we resumed jen 5 descent. We advised approach of target. They confirmed traffic. We received absolutely no TA's by ATC. Without TCASII, a midair collision was a likely possibility. There were no injuries during the incident.

Original NASA ASRS Text

Title: MD80 FO STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA.

Narrative: DSNDING THROUGH 13000 FT, WE RECEIVED A TCASII ALERT TA. RECEIVED TCASII RA AT 12700 FT. DSNDING, FO SMOOTHLY RESPONDED TO THE RA FROM A 2000 FPM DSCNT TO A 2000 FPM CLB, RESULTING IN VFR TARGET PASSING 400 FT BELOW. TA TERMINATED AT 13200 FT, AND WE RESUMED JEN 5 DSCNT. WE ADVISED APCH OF TARGET. THEY CONFIRMED TFC. WE RECEIVED ABSOLUTELY NO TA'S BY ATC. WITHOUT TCASII, A MIDAIR COLLISION WAS A LIKELY POSSIBILITY. THERE WERE NO INJURIES DURING THE INCIDENT.

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.