Narrative:

The incident began with my d-side initiating a handoff to the mcw sector on cpr Y, swbound from the coton sector into the mcw sector. Around this time I was vectoring an air carrier off course for intrail to ord when air carrier Y first checked on my frequency. I heard the aircraft state that he was level at FL330, expecting FL290 70 mi east (of mcw). However, I was not positive of the call sign, but because of my priority of duties, I did not immediately verify the call sign. Instead, I turned an air carrier to jvl so as to keep my string of ord inbounds evenly spaced. After doing so, I asked the aircraft calling center to say again. Air carrier Y checked back on, it confirmed that it was the aircraft I thought had previously called on. However, I understood from his first transmission that he was level at FL330, expecting FL290. I did not know that he had been given a descent clearance by mcw. By this time, msp had taken the handoff on cpr X. My d-side informed me that mcw had taken a pointout on cpr X and I was to keep the aircraft. Someone from the east area called on my landline. During that coordination, air carrier Y reported out of FL330. I did not hear this transmission. My d-side, who was listening to the frequency, heard it and brought it to my attention. I immediately told air carrier Y to maintain FL330 and to turn 30 degrees left. Air carrier Y did not respond. I then gave air carrier Y the clearance to maintain FL320 and to fly a 030 degree heading as well as calling out the traffic. Air carrier Y then reported out of 30400 ft. I called the traffic again to air carrier Y and then to cpr X. Cpr X reported the traffic in sight.

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Original NASA ASRS Text

Title: CPR X HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: THE INCIDENT BEGAN WITH MY D-SIDE INITIATING A HDOF TO THE MCW SECTOR ON CPR Y, SWBOUND FROM THE COTON SECTOR INTO THE MCW SECTOR. AROUND THIS TIME I WAS VECTORING AN ACR OFF COURSE FOR INTRAIL TO ORD WHEN ACR Y FIRST CHKED ON MY FREQ. I HEARD THE ACFT STATE THAT HE WAS LEVEL AT FL330, EXPECTING FL290 70 MI E (OF MCW). HOWEVER, I WAS NOT POSITIVE OF THE CALL SIGN, BUT BECAUSE OF MY PRIORITY OF DUTIES, I DID NOT IMMEDIATELY VERIFY THE CALL SIGN. INSTEAD, I TURNED AN ACR TO JVL SO AS TO KEEP MY STRING OF ORD INBOUNDS EVENLY SPACED. AFTER DOING SO, I ASKED THE ACFT CALLING CENTER TO SAY AGAIN. ACR Y CHKED BACK ON, IT CONFIRMED THAT IT WAS THE ACFT I THOUGHT HAD PREVIOUSLY CALLED ON. HOWEVER, I UNDERSTOOD FROM HIS FIRST XMISSION THAT HE WAS LEVEL AT FL330, EXPECTING FL290. I DID NOT KNOW THAT HE HAD BEEN GIVEN A DSCNT CLRNC BY MCW. BY THIS TIME, MSP HAD TAKEN THE HDOF ON CPR X. MY D-SIDE INFORMED ME THAT MCW HAD TAKEN A POINTOUT ON CPR X AND I WAS TO KEEP THE ACFT. SOMEONE FROM THE E AREA CALLED ON MY LANDLINE. DURING THAT COORD, ACR Y RPTED OUT OF FL330. I DID NOT HEAR THIS XMISSION. MY D-SIDE, WHO WAS LISTENING TO THE FREQ, HEARD IT AND BROUGHT IT TO MY ATTN. I IMMEDIATELY TOLD ACR Y TO MAINTAIN FL330 AND TO TURN 30 DEGS L. ACR Y DID NOT RESPOND. I THEN GAVE ACR Y THE CLRNC TO MAINTAIN FL320 AND TO FLY A 030 DEG HDG AS WELL AS CALLING OUT THE TFC. ACR Y THEN RPTED OUT OF 30400 FT. I CALLED THE TFC AGAIN TO ACR Y AND THEN TO CPR X. CPR X RPTED THE TFC IN SIGHT.

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.