Narrative:

While level at 4000 ft MSL, during vectors for a visual to lga runway 22, ATC called VFR traffic 'over manhattan' at 4500 ft MSL. We did not see the called traffic. Shortly thereafter our TCASII picked up the target at 12 O'clock at 3 NM, closing. A 'descend' TCASII RA was signaled, followed by our compliance and a descent to 3700 ft MSL. After 'clear of conflict' was issued, we climbed back to 4000 ft MSL and informed ATC of our TCASII RA.

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Original NASA ASRS Text

Title: AN ACR MLG CREW DSNDED IN RESPONSE TO A TCASII COMMAND.

Narrative: WHILE LEVEL AT 4000 FT MSL, DURING VECTORS FOR A VISUAL TO LGA RWY 22, ATC CALLED VFR TFC 'OVER MANHATTAN' AT 4500 FT MSL. WE DID NOT SEE THE CALLED TFC. SHORTLY THEREAFTER OUR TCASII PICKED UP THE TARGET AT 12 O'CLOCK AT 3 NM, CLOSING. A 'DSND' TCASII RA WAS SIGNALED, FOLLOWED BY OUR COMPLIANCE AND A DSCNT TO 3700 FT MSL. AFTER 'CLR OF CONFLICT' WAS ISSUED, WE CLBED BACK TO 4000 FT MSL AND INFORMED ATC OF OUR TCASII RA.

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.