Narrative:

TCASII RA. We were cruising sbound on amber 300, level at FL390. About 2 mins south of wayde, at XA56Z, we got a 'traffic, traffic' TCASII aural warning, followed almost immediately by a 'climb now' aural and the vsi commanding a 2100-2300 FPM climb. I immediately disconnected the autoplt and started climbing, referencing the vsi. Reaching FL397, a clear of conflict aural was heard and we returned to FL390. We then called ZNY via the bda remote (128.5) and ZZZ comrdo on 113.96 to notify them. The first TCASII caution showed an aircraft to our left, climbing rapidly across our flight path left to right. The aircraft appeared to be a B757. We told ATC that it looked like the other aircraft was moving east to west, but considering the winds at altitude, it is probable that the aircraft was going north on A300. Supplemental information from acn 538370: passing wayde intersection in the watrs region, we received a TCASII TA. I believe the TCASII displayed the traffic around 10 mi ahead, 1100 ft below and climbing. I went eyes outside to get a visual and picked up the aircraft at 11 O'clock position. The captain said 'he is still climbing.' the visual impression was also of an aggressive climb. I looked at the TCASII display again and the traffic was 500 ft below us and climbing at around 5 mi. As the captain disconnected the autoplt, we received a TCASII 'climb' command of 2000 FPM. We climbed to FL395 before we received a 'monitor vertical speed' with TCASII commanding level flight and then very quickly 'conflict clear.' we passed 500 ft above and 1-2 mi from the traffic. I believe it was a B757. I saw no airline markings. We returned to FL390 and informed bermuda and new york ZZZ comrdo of the incident.

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Original NASA ASRS Text

Title: B757-200 CREW AND A B757 HAD LESS THAN LEGAL SEPARATION IN ATLANTIC INTL AIRSPACE.

Narrative: TCASII RA. WE WERE CRUISING SBOUND ON AMBER 300, LEVEL AT FL390. ABOUT 2 MINS S OF WAYDE, AT XA56Z, WE GOT A 'TFC, TFC' TCASII AURAL WARNING, FOLLOWED ALMOST IMMEDIATELY BY A 'CLB NOW' AURAL AND THE VSI COMMANDING A 2100-2300 FPM CLB. I IMMEDIATELY DISCONNECTED THE AUTOPLT AND STARTED CLBING, REFING THE VSI. REACHING FL397, A CLR OF CONFLICT AURAL WAS HEARD AND WE RETURNED TO FL390. WE THEN CALLED ZNY VIA THE BDA REMOTE (128.5) AND ZZZ COMRDO ON 113.96 TO NOTIFY THEM. THE FIRST TCASII CAUTION SHOWED AN ACFT TO OUR L, CLBING RAPIDLY ACROSS OUR FLT PATH L TO R. THE ACFT APPEARED TO BE A B757. WE TOLD ATC THAT IT LOOKED LIKE THE OTHER ACFT WAS MOVING E TO W, BUT CONSIDERING THE WINDS AT ALT, IT IS PROBABLE THAT THE ACFT WAS GOING N ON A300. SUPPLEMENTAL INFO FROM ACN 538370: PASSING WAYDE INTXN IN THE WATRS REGION, WE RECEIVED A TCASII TA. I BELIEVE THE TCASII DISPLAYED THE TFC AROUND 10 MI AHEAD, 1100 FT BELOW AND CLBING. I WENT EYES OUTSIDE TO GET A VISUAL AND PICKED UP THE ACFT AT 11 O'CLOCK POS. THE CAPT SAID 'HE IS STILL CLBING.' THE VISUAL IMPRESSION WAS ALSO OF AN AGGRESSIVE CLB. I LOOKED AT THE TCASII DISPLAY AGAIN AND THE TFC WAS 500 FT BELOW US AND CLBING AT AROUND 5 MI. AS THE CAPT DISCONNECTED THE AUTOPLT, WE RECEIVED A TCASII 'CLB' COMMAND OF 2000 FPM. WE CLBED TO FL395 BEFORE WE RECEIVED A 'MONITOR VERT SPD' WITH TCASII COMMANDING LEVEL FLT AND THEN VERY QUICKLY 'CONFLICT CLR.' WE PASSED 500 FT ABOVE AND 1-2 MI FROM THE TFC. I BELIEVE IT WAS A B757. I SAW NO AIRLINE MARKINGS. WE RETURNED TO FL390 AND INFORMED BERMUDA AND NEW YORK ZZZ COMRDO OF 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.