Narrative:

We were just past fjc VOR on the milton 1 arrival (mip.MIP1) to lga. We had just received a clearance from ZNY (135.0 frequency) to descend from 12000 ft to 10000 ft. At approximately 11400 ft we got a TA on the TCASII. At approximately 11100 ft, we got an RA on the TCASII, that said to stop descent. We leveled at 11000 ft and saw a cabin class twin pass directly below us heading northwest. The TCASII indicated he was 600 ft below our altitude. I called ZNY to tell him of this incident. His response was that he had VFR traffic at 9500 ft but that he was not talking to him. When I called ZNY to report the incident, I idented ourselves by our 'air carrier X' call sign. The controller responded using a civilian aircraft call sign, but was relating information pertinent to our incident. I queried ZNY again using 'air carrier X.' the controller, again he responded with a civilian call sign. The third time I called I asked if ZNY could read 'air carrier X.' the controller response was yes. I asked if he had heard my transmission about our TCASII RA and visual sighting. The controller responded yes. I told him his reported 9500 ft traffic was over 10000 ft. The controller response was to give us a frequency change.

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Original NASA ASRS Text

Title: FLC OF A DC9 LEVELED OFF DURING DSCNT IN RESPONSE TO A TCASII RA AND OBSERVED A TWIN CESSNA PASS UNDERNEATH THEIR ACFT ABOUT 600 FT BELOW ACCORDING TO TCASII.

Narrative: WE WERE JUST PAST FJC VOR ON THE MILTON 1 ARR (MIP.MIP1) TO LGA. WE HAD JUST RECEIVED A CLRNC FROM ZNY (135.0 FREQ) TO DSND FROM 12000 FT TO 10000 FT. AT APPROX 11400 FT WE GOT A TA ON THE TCASII. AT APPROX 11100 FT, WE GOT AN RA ON THE TCASII, THAT SAID TO STOP DSCNT. WE LEVELED AT 11000 FT AND SAW A CABIN CLASS TWIN PASS DIRECTLY BELOW US HDG NW. THE TCASII INDICATED HE WAS 600 FT BELOW OUR ALT. I CALLED ZNY TO TELL HIM OF THIS INCIDENT. HIS RESPONSE WAS THAT HE HAD VFR TFC AT 9500 FT BUT THAT HE WAS NOT TALKING TO HIM. WHEN I CALLED ZNY TO RPT THE INCIDENT, I IDENTED OURSELVES BY OUR 'ACR X' CALL SIGN. THE CTLR RESPONDED USING A CIVILIAN ACFT CALL SIGN, BUT WAS RELATING INFO PERTINENT TO OUR INCIDENT. I QUERIED ZNY AGAIN USING 'ACR X.' THE CTLR, AGAIN HE RESPONDED WITH A CIVILIAN CALL SIGN. THE THIRD TIME I CALLED I ASKED IF ZNY COULD READ 'ACR X.' THE CTLR RESPONSE WAS YES. I ASKED IF HE HAD HEARD MY XMISSION ABOUT OUR TCASII RA AND VISUAL SIGHTING. THE CTLR RESPONDED YES. I TOLD HIM HIS RPTED 9500 FT TFC WAS OVER 10000 FT. THE CTLR RESPONSE WAS TO GIVE US A FREQ CHANGE.

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.