Narrative:

On initial approach vector for the ILS runway 13 at acy we were vectored across the localizer from the southwest to the northeast, (030 degree heading assigned). We were then assigned a 310 degree heading at 3000 ft MSL (left turn). We complied with the clearance limit. Upon rollout in the turn, the TCASII picked up traffic about 3-4 mi opposite direction at the same altitude. The TCASII then issued a command of monitor vertical speed and almost immediately thereafter commanded a 'descend now' (approximately 2500 FPM). We complied with the TCASII commands. About 3 seconds into the RA I noticed that the opposite direction traffic had also started a descent, at that point I began to more aggressively push the nose down (approximately 3000-4000 FPM down). At approximately 2000 ft MSL the traffic passed overhead, we then leveled off and climbed back up to our assigned altitude of 3000 ft MSL and reported the RA to ATC. I feel that a climbing command by our TCASII may have been a better course of action, also if we had a more up to date TCASII it may have given some steering commands. At no time did the ATC facility issue traffic warnings or advisories.

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Original NASA ASRS Text

Title: ACFT FLYING INTO ACY HAS A LESS SEVERE NMAC WITH ANOTHER ACFT.

Narrative: ON INITIAL APCH VECTOR FOR THE ILS RWY 13 AT ACY WE WERE VECTORED ACROSS THE LOC FROM THE SW TO THE NE, (030 DEG HDG ASSIGNED). WE WERE THEN ASSIGNED A 310 DEG HDG AT 3000 FT MSL (L TURN). WE COMPLIED WITH THE CLRNC LIMIT. UPON ROLLOUT IN THE TURN, THE TCASII PICKED UP TFC ABOUT 3-4 MI OPPOSITE DIRECTION AT THE SAME ALT. THE TCASII THEN ISSUED A COMMAND OF MONITOR VERT SPD AND ALMOST IMMEDIATELY THEREAFTER COMMANDED A 'DSND NOW' (APPROX 2500 FPM). WE COMPLIED WITH THE TCASII COMMANDS. ABOUT 3 SECONDS INTO THE RA I NOTICED THAT THE OPPOSITE DIRECTION TFC HAD ALSO STARTED A DSCNT, AT THAT POINT I BEGAN TO MORE AGGRESSIVELY PUSH THE NOSE DOWN (APPROX 3000-4000 FPM DOWN). AT APPROX 2000 FT MSL THE TFC PASSED OVERHEAD, WE THEN LEVELED OFF AND CLBED BACK UP TO OUR ASSIGNED ALT OF 3000 FT MSL AND RPTED THE RA TO ATC. I FEEL THAT A CLBING COMMAND BY OUR TCASII MAY HAVE BEEN A BETTER COURSE OF ACTION, ALSO IF WE HAD A MORE UP TO DATE TCASII IT MAY HAVE GIVEN SOME STEERING COMMANDS. AT NO TIME DID THE ATC FACILITY ISSUE TFC WARNINGS OR ADVISORIES.

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.