Narrative:

While cruising at FL380 along J75 north of gve; out of nowhere we get a TA on our TCAS. Immediately the controller (ZDC) instructed us to turn to a 270 degree heading. You could tell by his voice he needed the turn immediately. As we were making a right turn to 270 degrees we got an RA telling us to climb. We followed the RA; as I remember; it was commanding a climb of at least 1000 FPM. As soon as we climbed through FL381; the TCAS announced 'clear of conflict.' I told center that we responded to our RA and that our TCAS told us we were clear of conflict. We descended back to FL380 and I told center that. I asked the controller where that guy came from; and after a brief pause he informed me that he (other aircraft) had been given a turn and descent. He (other aircraft) made the turn but did not descend to the assigned altitude. At no time prior to or during the TA RA did we have visual contact with the other aircraft. Supplemental information from acn 710009: while cruising at FL380 along J75 north of gve we received a TA on our TCAS. The controller (ZDC) alerted us of the traffic at 12 O'clock. Our TCAS showed his altitude at FL384 and as we looked for the traffic we both noticed the traffic at our 12:30 - 1 O'clock position and well below us. Our TCAS began to give us an RA but we both agreed that the traffic (the only traffic on our TCAS) was well below our FL380 cruising altitude and we remained at FL380 and informed the controller that the reported traffic was well below our altitude but our TCAS reported his altitude to be FL384. The controller questioned the other aircraft as to his present altitude and we heard him report to the controller that he had 3 altimeters reporting FL370. We heard the controller tell him that 2 aircraft had reported a TA RA which showed his aircraft at FL384. This happened to be the second TA RA within 20-25 mins for us along J75.

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Original NASA ASRS Text

Title: FALCON 2000 HAS MULTIPLE TCAS RA WARNINGS WHILE AT CRUISE.

Narrative: WHILE CRUISING AT FL380 ALONG J75 N OF GVE; OUT OF NOWHERE WE GET A TA ON OUR TCAS. IMMEDIATELY THE CTLR (ZDC) INSTRUCTED US TO TURN TO A 270 DEG HDG. YOU COULD TELL BY HIS VOICE HE NEEDED THE TURN IMMEDIATELY. AS WE WERE MAKING A R TURN TO 270 DEGS WE GOT AN RA TELLING US TO CLB. WE FOLLOWED THE RA; AS I REMEMBER; IT WAS COMMANDING A CLB OF AT LEAST 1000 FPM. AS SOON AS WE CLBED THROUGH FL381; THE TCAS ANNOUNCED 'CLR OF CONFLICT.' I TOLD CTR THAT WE RESPONDED TO OUR RA AND THAT OUR TCAS TOLD US WE WERE CLR OF CONFLICT. WE DSNDED BACK TO FL380 AND I TOLD CTR THAT. I ASKED THE CTLR WHERE THAT GUY CAME FROM; AND AFTER A BRIEF PAUSE HE INFORMED ME THAT HE (OTHER ACFT) HAD BEEN GIVEN A TURN AND DSCNT. HE (OTHER ACFT) MADE THE TURN BUT DID NOT DSND TO THE ASSIGNED ALT. AT NO TIME PRIOR TO OR DURING THE TA RA DID WE HAVE VISUAL CONTACT WITH THE OTHER ACFT. SUPPLEMENTAL INFO FROM ACN 710009: WHILE CRUISING AT FL380 ALONG J75 N OF GVE WE RECEIVED A TA ON OUR TCAS. THE CTLR (ZDC) ALERTED US OF THE TFC AT 12 O'CLOCK. OUR TCAS SHOWED HIS ALT AT FL384 AND AS WE LOOKED FOR THE TFC WE BOTH NOTICED THE TFC AT OUR 12:30 - 1 O'CLOCK POS AND WELL BELOW US. OUR TCAS BEGAN TO GIVE US AN RA BUT WE BOTH AGREED THAT THE TFC (THE ONLY TFC ON OUR TCAS) WAS WELL BELOW OUR FL380 CRUISING ALT AND WE REMAINED AT FL380 AND INFORMED THE CTLR THAT THE RPTED TFC WAS WELL BELOW OUR ALT BUT OUR TCAS RPTED HIS ALT TO BE FL384. THE CTLR QUESTIONED THE OTHER ACFT AS TO HIS PRESENT ALT AND WE HEARD HIM RPT TO THE CTLR THAT HE HAD 3 ALTIMETERS RPTING FL370. WE HEARD THE CTLR TELL HIM THAT 2 ACFT HAD RPTED A TA RA WHICH SHOWED HIS ACFT AT FL384. THIS HAPPENED TO BE THE SECOND TA RA WITHIN 20-25 MINS FOR US ALONG J75.

Data retrieved from NASA's ASRS site as of January 2009 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.