Narrative:

We were approximately 20 miles south of lga at 8;000 ft on the gatby 1 arrival when ATC advised us of a descending target which appeared to be within close proximity to our aircraft. After the initial advisory; ATC assigned a new heading to avoid the target. Within a few seconds of this new heading we received a TCAS message which required a climb of 2;000 ft/minute to avoid the conflict. Once clear of the conflict we informed ATC of our evasive maneuver. ATC then provided a new heading and also a descent to rejoin the arrival into lga. The remainder of the flight was uneventful.

Google
 

Original NASA ASRS Text

Title: An SF-340 flight crew reported a conflict on arrival to LGA that resulted in a climb to comply with TCAS RA.

Narrative: We were approximately 20 miles south of LGA at 8;000 FT on the Gatby 1 Arrival when ATC advised us of a descending target which appeared to be within close proximity to our aircraft. After the initial advisory; ATC assigned a new heading to avoid the target. Within a few seconds of this new heading we received a TCAS message which required a climb of 2;000 FT/minute to avoid the conflict. Once clear of the conflict we informed ATC of our evasive maneuver. ATC then provided a new heading and also a descent to rejoin the arrival into LGA. The remainder of the flight was uneventful.

Data retrieved from NASA's ASRS site as of April 2012 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.