Narrative:

TCASII RA at FL330. During cruise at FL330, we received a TCASII RA for converging co-altitude traffic at 11 O'clock position. TCASII sounded 'traffic, traffic' and then ATC directed a 30 degree right turn. TCASII then commanded a 2000 FPM climb. Maximum cruise altitude with 1.3 'G' buffet was FL330 so we were unable to escape vertically. We entered a climbing right turn to increase lateral separation as our only option. Other airplane responded with a TCASII RA to descend. Estimate miss distance 3 mi. Our altitude deviation was 300 ft high. No passenger or cabin crew reported any problems or injuries. Incident may have caused in part with a sudden rerte from bna J42 bkw to bna direct iiu. Supplemental information from acn 474051: IMC in high level clouds. Just prior to passing bna VOR, we received a rerte due to flow control, which required a right turn at bna to iiu instead of proceeding on J42. After making the turn, we immediately were alerted 'traffic, traffic.' then ATC gave us a 30 degree turn right. We then were alerted 'climb, climb.' we tried to climb, but were at the buffet limit due to weight and only managed 300 ft, but increased the turn to assure lateral separation. The other aircraft also was given a 30 degree turn by ATC and reported an RA requiring a descent. Passenger on our flight did not seem to notice the maneuver though flight attendants did notice. Total altitude deviation was 300 ft high.

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Original NASA ASRS Text

Title: MD80 CREW HAD NMAC ON DSCNT INTO RDU.

Narrative: TCASII RA AT FL330. DURING CRUISE AT FL330, WE RECEIVED A TCASII RA FOR CONVERGING CO-ALT TFC AT 11 O'CLOCK POS. TCASII SOUNDED 'TFC, TFC' AND THEN ATC DIRECTED A 30 DEG R TURN. TCASII THEN COMMANDED A 2000 FPM CLB. MAX CRUISE ALT WITH 1.3 'G' BUFFET WAS FL330 SO WE WERE UNABLE TO ESCAPE VERTLY. WE ENTERED A CLBING R TURN TO INCREASE LATERAL SEPARATION AS OUR ONLY OPTION. OTHER AIRPLANE RESPONDED WITH A TCASII RA TO DSND. ESTIMATE MISS DISTANCE 3 MI. OUR ALTDEV WAS 300 FT HIGH. NO PAX OR CABIN CREW RPTED ANY PROBS OR INJURIES. INCIDENT MAY HAVE CAUSED IN PART WITH A SUDDEN RERTE FROM BNA J42 BKW TO BNA DIRECT IIU. SUPPLEMENTAL INFO FROM ACN 474051: IMC IN HIGH LEVEL CLOUDS. JUST PRIOR TO PASSING BNA VOR, WE RECEIVED A RERTE DUE TO FLOW CTL, WHICH REQUIRED A R TURN AT BNA TO IIU INSTEAD OF PROCEEDING ON J42. AFTER MAKING THE TURN, WE IMMEDIATELY WERE ALERTED 'TFC, TFC.' THEN ATC GAVE US A 30 DEG TURN R. WE THEN WERE ALERTED 'CLB, CLB.' WE TRIED TO CLB, BUT WERE AT THE BUFFET LIMIT DUE TO WT AND ONLY MANAGED 300 FT, BUT INCREASED THE TURN TO ASSURE LATERAL SEPARATION. THE OTHER ACFT ALSO WAS GIVEN A 30 DEG TURN BY ATC AND RPTED AN RA REQUIRING A DSCNT. PAX ON OUR FLT DID NOT SEEM TO NOTICE THE MANEUVER THOUGH FLT ATTENDANTS DID NOTICE. TOTAL ALTDEV WAS 300 FT HIGH.

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.