Narrative:

Air carrier X on a vector from ZNY of 060 degrees right off of airway. Received instructions to turn left to intercept J-174 (original routing). Just as the controller said turn left to ..., the TCASII issued an RA. There was no TA. I looked down on the radar scope and noted traffic at 10 degrees left, 6 NM, 1100 ft high and in a descent. I rolled out of the left turn, uncoupled the autoplt and began a descent. The vvi indicated a 1500-2000 FPM green arc. The traffic was not visible due to high cirrus clouds at FL350. At 2 NM the traffic was noted at 800 ft high and leveled off as we had descended to FL342. TCASII issued a monitor vertical speed command just as I looked out the left wind screen and noted a widebody transport seemingly level and within 1/4-1/2 NM. ATC was notified of the close encounter as we leveled off at FL342. We then climbed to FL350 and initiated the left turn to intercept J-174 north of swl. Supplemental information from acn 238204: air carrier X passing 34300 ft we saw a widebody transport pass off our left wing within 1/2 mi and still descending. We leveled off at 34200 ft after TCASII notified cleared of conflict. We notified ZNY of the evasive action and was cleared back up to FL350. We believe if we hadn't had TCASII on board things would have been much closer than they occurred. ZNY thanked us for our help and confirmed the event.

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Original NASA ASRS Text

Title: ACR X TCASII RA DSND HAD LTSS FROM WDB DSCNT THROUGH OCCUPIED ALT. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: ACR X ON A VECTOR FROM ZNY OF 060 DEGS R OFF OF AIRWAY. RECEIVED INSTRUCTIONS TO TURN L TO INTERCEPT J-174 (ORIGINAL ROUTING). JUST AS THE CTLR SAID TURN L TO ..., THE TCASII ISSUED AN RA. THERE WAS NO TA. I LOOKED DOWN ON THE RADAR SCOPE AND NOTED TFC AT 10 DEGS L, 6 NM, 1100 FT HIGH AND IN A DSCNT. I ROLLED OUT OF THE L TURN, UNCOUPLED THE AUTOPLT AND BEGAN A DSCNT. THE VVI INDICATED A 1500-2000 FPM GREEN ARC. THE TFC WAS NOT VISIBLE DUE TO HIGH CIRRUS CLOUDS AT FL350. AT 2 NM THE TFC WAS NOTED AT 800 FT HIGH AND LEVELED OFF AS WE HAD DSNDED TO FL342. TCASII ISSUED A MONITOR VERT SPD COMMAND JUST AS I LOOKED OUT THE L WIND SCREEN AND NOTED A WDB SEEMINGLY LEVEL AND WITHIN 1/4-1/2 NM. ATC WAS NOTIFIED OF THE CLOSE ENCOUNTER AS WE LEVELED OFF AT FL342. WE THEN CLBED TO FL350 AND INITIATED THE L TURN TO INTERCEPT J-174 N OF SWL. SUPPLEMENTAL INFO FROM ACN 238204: ACR X PASSING 34300 FT WE SAW A WDB PASS OFF OUR L WING WITHIN 1/2 MI AND STILL DSNDING. WE LEVELED OFF AT 34200 FT AFTER TCASII NOTIFIED CLRED OF CONFLICT. WE NOTIFIED ZNY OF THE EVASIVE ACTION AND WAS CLRED BACK UP TO FL350. WE BELIEVE IF WE HADN'T HAD TCASII ON BOARD THINGS WOULD HAVE BEEN MUCH CLOSER THAN THEY OCCURRED. ZNY THANKED US FOR OUR HELP AND CONFIRMED THE EVENT.

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.