Air carrier has TCASII RA, responds.

Attributes
ACN	249031
Time
Date	199308
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : stl
State Reference	MO
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute airway : stl
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : commercial pilot : atp pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 4500 flight time type : 1350
ASRS Report	249031
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

On descent into stl, we received a TCASII TA. The target was at our 11 O'clock and below us. We visually acquired the aircraft at approximately 11 O'clock and 2 mi, crossing our nose left to right and appearing to be climbing through our altitude. At the same time, our TCASII directed a climb of approximately 1000 FPM. The PIC complied with the TCASII RA directive and we reported the traffic and altitude deviation to ATC. ATC answered our call, but I do not remember ATC pointing out the traffic prior to the conflict. If we hadn't acquired the aircraft via TCASII and visually, we would have crossed very close, both horizontally and vertically. I don't remember our exact position or altitude. The other aircraft was some type of bizjet.

Original NASA ASRS Text

Title: ACR HAS TCASII RA, RESPONDS.

Narrative: ON DSCNT INTO STL, WE RECEIVED A TCASII TA. THE TARGET WAS AT OUR 11 O'CLOCK AND BELOW US. WE VISUALLY ACQUIRED THE ACFT AT APPROX 11 O'CLOCK AND 2 MI, XING OUR NOSE L TO R AND APPEARING TO BE CLBING THROUGH OUR ALT. AT THE SAME TIME, OUR TCASII DIRECTED A CLB OF APPROX 1000 FPM. THE PIC COMPLIED WITH THE TCASII RA DIRECTIVE AND WE RPTED THE TFC AND ALTDEV TO ATC. ATC ANSWERED OUR CALL, BUT I DO NOT REMEMBER ATC POINTING OUT THE TFC PRIOR TO THE CONFLICT. IF WE HADN'T ACQUIRED THE ACFT VIA TCASII AND VISUALLY, WE WOULD HAVE CROSSED VERY CLOSE, BOTH HORIZLY AND VERTICALLY. I DON'T REMEMBER OUR EXACT POS OR ALT. THE OTHER ACFT WAS SOME TYPE OF BIZJET.

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.