Narrative:

Air carrier X took of and was executing the lga 4 departure runway 13 (maspeth climb). We were on departure frequency 120.4. We had reached 3000 ft and made our right turn towards 340 degrees. We had been reclred to 6000 ft. We were given heading changes to 320 degrees followed soon thereafter with a heading change to 290 degrees. At approximately 3600-3800 ft we received an RA to descend by the TCASII showing we needed a descent of 2000 ft down. The target was close ahead and higher, altitude not observed by me or my crew. We initiated a smooth nose-over and may have reached 4300 ft or more, before descent input took effect. I saw a solid red square at the 0130 O'clock position and this was confirmed by the first officer, distance approximately 1 mi. I believe I saw plus 01 on the TCASII screen. We received a total of 2 RA commands to descend. I estimate we had about a 1000 ft rate of descent and increasing when the RA ceased and we were given the clear of traffic announcement. We resumed a climb. The controller asked about our descent and I advised we had followed an RA and asked him if he showed any traffic that would have caused the RA. He answered that he did not have any conflicting traffic (not his exact words). We were given additional altitude changes to 15000 ft, 12000 ft, and 9000 ft very quickly and additional heading changes as well. Very shortly after my first 'interrogative' as to additional traffic that would have caused the RA, I asked again and the controller repeated his negative reply. At that time, air carrier Y came on the frequency and said that he had seen us, that he had received an RA at the same time and requested the controller's telephone number. I did not talk to air carrier Y myself as the frequency was very busy and I did not see the need to debate the issue on the air. I do not know whether air carrier Y saw my aircraft visually or on the TCASII screen. I also do not know whether flight air carrier Y executed any RA maneuver.

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Original NASA ASRS Text

Title: ACR X TCASII RA HAD LTSS FROM ACR Y. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: ACR X TOOK OF AND WAS EXECUTING THE LGA 4 DEP RWY 13 (MASPETH CLB). WE WERE ON DEP FREQ 120.4. WE HAD REACHED 3000 FT AND MADE OUR R TURN TOWARDS 340 DEGS. WE HAD BEEN RECLRED TO 6000 FT. WE WERE GIVEN HDG CHANGES TO 320 DEGS FOLLOWED SOON THEREAFTER WITH A HDG CHANGE TO 290 DEGS. AT APPROX 3600-3800 FT WE RECEIVED AN RA TO DSND BY THE TCASII SHOWING WE NEEDED A DSCNT OF 2000 FT DOWN. THE TARGET WAS CLOSE AHEAD AND HIGHER, ALT NOT OBSERVED BY ME OR MY CREW. WE INITIATED A SMOOTH NOSE-OVER AND MAY HAVE REACHED 4300 FT OR MORE, BEFORE DSCNT INPUT TOOK EFFECT. I SAW A SOLID RED SQUARE AT THE 0130 O'CLOCK POS AND THIS WAS CONFIRMED BY THE FO, DISTANCE APPROX 1 MI. I BELIEVE I SAW PLUS 01 ON THE TCASII SCREEN. WE RECEIVED A TOTAL OF 2 RA COMMANDS TO DSND. I ESTIMATE WE HAD ABOUT A 1000 FT RATE OF DSCNT AND INCREASING WHEN THE RA CEASED AND WE WERE GIVEN THE CLR OF TFC ANNOUNCEMENT. WE RESUMED A CLB. THE CTLR ASKED ABOUT OUR DSCNT AND I ADVISED WE HAD FOLLOWED AN RA AND ASKED HIM IF HE SHOWED ANY TFC THAT WOULD HAVE CAUSED THE RA. HE ANSWERED THAT HE DID NOT HAVE ANY CONFLICTING TFC (NOT HIS EXACT WORDS). WE WERE GIVEN ADDITIONAL ALT CHANGES TO 15000 FT, 12000 FT, AND 9000 FT VERY QUICKLY AND ADDITIONAL HDG CHANGES AS WELL. VERY SHORTLY AFTER MY FIRST 'INTERROGATIVE' AS TO ADDITIONAL TFC THAT WOULD HAVE CAUSED THE RA, I ASKED AGAIN AND THE CTLR REPEATED HIS NEGATIVE REPLY. AT THAT TIME, ACR Y CAME ON THE FREQ AND SAID THAT HE HAD SEEN US, THAT HE HAD RECEIVED AN RA AT THE SAME TIME AND REQUESTED THE CTLR'S TELEPHONE NUMBER. I DID NOT TALK TO ACR Y MYSELF AS THE FREQ WAS VERY BUSY AND I DID NOT SEE THE NEED TO DEBATE THE ISSUE ON THE AIR. I DO NOT KNOW WHETHER ACR Y SAW MY ACFT VISUALLY OR ON THE TCASII SCREEN. I ALSO DO NOT KNOW WHETHER FLT ACR Y EXECUTED ANY RA MANEUVER.

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.