Narrative:

Aircraft #1 at FL330 was eastbound direct oma. Aircraft #2 at FL310 was wbound direct hct. Aircraft #3 was a gri departure at FL290 eastbound direct pmm. Aircraft #1 was given a 15 degree right turn and a descent clearance to FL240. The radar person had put a dri on aircraft #3. I believe the radar person thought they put the dri on aircraft #2. I was training a developmental on the d- side. When I looked at the radar and noticed there would not be enough separation, I told the radar person. He then reclred aircraft #1 to FL330 but separation was lost. I believe the radar person had just returned from some leave. He had only been in the sector 10 or 15 mins. Supplemental information from acn 420571: aircraft X was out of FL325 and descending when the radar controller saw his mistake and amended his altitude to FL330. By that time, we already lost separation. I was working the d-side (data) position as a trainee. Supplemental information from acn 420590: center was asked for a descent with traffic permitting. A right turn of 15 degrees was given with a descent to FL240 from FL330. As the aircraft descended a TCASII RA annunciated 'climb.' at the same time center came back with a clearance to maintain FL330. Climb was initiated back to FL330.

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Original NASA ASRS Text

Title: ARTCC DATA CTLR BRINGS TO THE ATTN OF ARTCC RADAR CTLR DECREASING SEPARATION SIT BTWN B757 AND B737. ARTCC RADAR CTLR DISTR BY CGA ACFT CTL ACTIONS. INSUFFICIENT TIME TO CORRECT LOSS OF SEPARATION.

Narrative: ACFT #1 AT FL330 WAS EBOUND DIRECT OMA. ACFT #2 AT FL310 WAS WBOUND DIRECT HCT. ACFT #3 WAS A GRI DEP AT FL290 EBOUND DIRECT PMM. ACFT #1 WAS GIVEN A 15 DEG R TURN AND A DSCNT CLRNC TO FL240. THE RADAR PERSON HAD PUT A DRI ON ACFT #3. I BELIEVE THE RADAR PERSON THOUGHT THEY PUT THE DRI ON ACFT #2. I WAS TRAINING A DEVELOPMENTAL ON THE D- SIDE. WHEN I LOOKED AT THE RADAR AND NOTICED THERE WOULD NOT BE ENOUGH SEPARATION, I TOLD THE RADAR PERSON. HE THEN RECLRED ACFT #1 TO FL330 BUT SEPARATION WAS LOST. I BELIEVE THE RADAR PERSON HAD JUST RETURNED FROM SOME LEAVE. HE HAD ONLY BEEN IN THE SECTOR 10 OR 15 MINS. SUPPLEMENTAL INFO FROM ACN 420571: ACFT X WAS OUT OF FL325 AND DSNDING WHEN THE RADAR CTLR SAW HIS MISTAKE AND AMENDED HIS ALT TO FL330. BY THAT TIME, WE ALREADY LOST SEPARATION. I WAS WORKING THE D-SIDE (DATA) POS AS A TRAINEE. SUPPLEMENTAL INFO FROM ACN 420590: CTR WAS ASKED FOR A DSCNT WITH TFC PERMITTING. A R TURN OF 15 DEGS WAS GIVEN WITH A DSCNT TO FL240 FROM FL330. AS THE ACFT DSNDED A TCASII RA ANNUNCIATED 'CLB.' AT THE SAME TIME CTR CAME BACK WITH A CLRNC TO MAINTAIN FL330. CLB WAS INITIATED BACK TO FL330.

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.