Narrative:

Received TA, then RA from aircraft climbing directly beneath us. ZOB did not advise us of the traffic. TCASII 'RA' procedures were followed, climbing from our assigned altitude of FL280 to FL290. ATC was advised of the deviation, and we were then told that there was an aircraft climbing to FL270. We then returned to FL280.

Google
 

Original NASA ASRS Text

Title: MLG AT CRUISE IN CLASS A AIRSPACE HAS TCASII TA THEN RA.

Narrative: RECEIVED TA, THEN RA FROM ACFT CLBING DIRECTLY BENEATH US. ZOB DID NOT ADVISE US OF THE TFC. TCASII 'RA' PROCS WERE FOLLOWED, CLBING FROM OUR ASSIGNED ALT OF FL280 TO FL290. ATC WAS ADVISED OF THE DEV, AND WE WERE THEN TOLD THAT THERE WAS AN ACFT CLBING TO FL270. WE THEN RETURNED TO FL280.

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.