Narrative:

Bos departure issued air carrier X turn to heading 040 degrees and a climb to 10000 ft. While in the turn, we received a TCASII TA. Approximately 3 second later we received a 'monitor vertical speed,' which instructed us to continue the climb at our present rate or greater. We visually saw the aircraft Y at our 1 O'clock position moving to our 2 O'clock position. The other aircraft Y told bos that they had a TCASII advisory and were following the RA advisory. We passed the aircraft Y and he appeared to be approximately 2 mi horizontal to our position and 500 ft below. Departure told us that we were diverging and our climb rate was sufficient.

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Original NASA ASRS Text

Title: ACR X TCASII RA HAD LTSS FROM ACFT Y. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: BOS DEP ISSUED ACR X TURN TO HDG 040 DEGS AND A CLB TO 10000 FT. WHILE IN THE TURN, WE RECEIVED A TCASII TA. APPROX 3 SEC LATER WE RECEIVED A 'MONITOR VERT SPD,' WHICH INSTRUCTED US TO CONTINUE THE CLB AT OUR PRESENT RATE OR GREATER. WE VISUALLY SAW THE ACFT Y AT OUR 1 O'CLOCK POS MOVING TO OUR 2 O'CLOCK POS. THE OTHER ACFT Y TOLD BOS THAT THEY HAD A TCASII ADVISORY AND WERE FOLLOWING THE RA ADVISORY. WE PASSED THE ACFT Y AND HE APPEARED TO BE APPROX 2 MI HORIZ TO OUR POS AND 500 FT BELOW. DEP TOLD US THAT WE WERE DIVERGING AND OUR CLB RATE WAS SUFFICIENT.

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.