Narrative:

I was working the eastbound departure from dfw. I had an air carrier X at FL220 crossing my sector. Air carrier Y was climbing eastbound to FL210. I called traffic to the climbing aircraft about the B727 at FL220 and reissued FL210. He (a B757) said he had the B727 on TCASII. I went to call traffic to the B727 about the climbing B757 and saw that his altitude showed FL217 and descending. I asked the B727 to verify level FL220 and got no response. I tried again still with no response. The B757 says he is getting an RA and says that he is climbing. The B727 finally calls and says that he got an RA and is descending to get away from traffic at his altitude. If these 2 aircraft would have listened to me instead of a piece of machinery they would have been properly separated by 1000 ft. Instead they tried to separate themselves and almost had a midair collision. The closest point was 1.3 mi and 300 ft. TCASII in the en route environment is a bad accident waiting to happen. Until they can modify this equipment so each airplane's computer knows what the other is doing, TCASII will never work. I don't think I have ever heard of a controller climbing an aircraft into another and the 2 hit yet we hear monthly how 2 aircraft have gotten RA's to climb and descend and almost hit.

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Original NASA ASRS Text

Title: ACR X UNAUTH DSCNT FROM ASSIGNED ALT TCASII RA HAD LTSS FROM ACR Y.

Narrative: I WAS WORKING THE EBOUND DEP FROM DFW. I HAD AN ACR X AT FL220 XING MY SECTOR. ACR Y WAS CLBING EBOUND TO FL210. I CALLED TFC TO THE CLBING ACFT ABOUT THE B727 AT FL220 AND REISSUED FL210. HE (A B757) SAID HE HAD THE B727 ON TCASII. I WENT TO CALL TFC TO THE B727 ABOUT THE CLBING B757 AND SAW THAT HIS ALT SHOWED FL217 AND DSNDING. I ASKED THE B727 TO VERIFY LEVEL FL220 AND GOT NO RESPONSE. I TRIED AGAIN STILL WITH NO RESPONSE. THE B757 SAYS HE IS GETTING AN RA AND SAYS THAT HE IS CLBING. THE B727 FINALLY CALLS AND SAYS THAT HE GOT AN RA AND IS DSNDING TO GET AWAY FROM TFC AT HIS ALT. IF THESE 2 ACFT WOULD HAVE LISTENED TO ME INSTEAD OF A PIECE OF MACHINERY THEY WOULD HAVE BEEN PROPERLY SEPARATED BY 1000 FT. INSTEAD THEY TRIED TO SEPARATE THEMSELVES AND ALMOST HAD A MIDAIR COLLISION. THE CLOSEST POINT WAS 1.3 MI AND 300 FT. TCASII IN THE ENRTE ENVIRONMENT IS A BAD ACCIDENT WAITING TO HAPPEN. UNTIL THEY CAN MODIFY THIS EQUIP SO EACH AIRPLANE'S COMPUTER KNOWS WHAT THE OTHER IS DOING, TCASII WILL NEVER WORK. I DON'T THINK I HAVE EVER HEARD OF A CTLR CLBING AN ACFT INTO ANOTHER AND THE 2 HIT YET WE HEAR MONTHLY HOW 2 ACFT HAVE GOTTEN RA'S TO CLB AND DSND AND ALMOST HIT.

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.