Narrative:

I was controller in charge (controller in charge). We had a busy session and traffic had decreased to 2-4 airplanes at the sector. I then told the controller they could one-person the sector. The controller on the d-side relieved the r-side. I proceeded to give a relief briefing for myself and the controller at the radar scope advised me that there was a loss of separation. I believe the cause of the problem to be -- the controller was looking at the altitude block of the traffic and read that altitude to the other aircraft when he meant to issue a different altitude.

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Original NASA ASRS Text

Title: RADAR ASSOCIATE TAKES OVER POS FROM RADAR CTLR AND ISSUES INCORRECT ALT TO CONVERGING TFC RESULTING IN A LOSS OF SEPARATION.

Narrative: I WAS CIC (CTLR IN CHARGE). WE HAD A BUSY SESSION AND TFC HAD DECREASED TO 2-4 AIRPLANES AT THE SECTOR. I THEN TOLD THE CTLR THEY COULD ONE-PERSON THE SECTOR. THE CTLR ON THE D-SIDE RELIEVED THE R-SIDE. I PROCEEDED TO GIVE A RELIEF BRIEFING FOR MYSELF AND THE CTLR AT THE RADAR SCOPE ADVISED ME THAT THERE WAS A LOSS OF SEPARATION. I BELIEVE THE CAUSE OF THE PROB TO BE -- THE CTLR WAS LOOKING AT THE ALT BLOCK OF THE TFC AND READ THAT ALT TO THE OTHER ACFT WHEN HE MEANT TO ISSUE A DIFFERENT ALT.

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.