Narrative:

I climbed an aircraft (air carrier X) to FL260; which is the LOA-prescribed altitude; pre-coordination for aircraft departing mdt going west to ZOB and requesting FL260 or above. The aircraft was only requesting FL240 and that was the 'hard' altitude which was xferred in the data block to the ZOB controller. The other aircraft was crossing paths at FL250. The ZOB controller took action to stop the climb but separation was lost. Supplemental information from acn 669352: air carrier X (the CRJ1) checked on climbing wbound on J80 out of FL195 for FL260. Air carrier X's data block showed FL240 as the final altitude. Aircraft Y was nebound at FL250. I thought air carrier X stated he was climbing to FL240. Air carrier X was climbing so slowly that his data block showed him level at FL240 for over 45 seconds. When the data block showed him above FL240; air carrier X was already within 5 mi of aircraft Y. I asked air carrier X to confirm level at FL240. He said negative; he was climbing to FL260. I turned air carrier X left to a heading of 180 degrees and had him descend back to FL240. Once air carrier X reached FL240; I reclred him on course. The controller in ZNY from whom I received the handoff on air carrier X confirmed that he cleared the aircraft to FL260 even though FL240 was the requested final altitude.

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Original NASA ASRS Text

Title: ZNY CTLR ISSUED LOA PRESCRIBED ALT OF FL260 FOR ZOB CTLR BUT FAILED TO RECOGNIZE AND CHANGE THE ALT IN THE DATA BLOCK (FL240) CAUSING AN OPERROR WITH TFC AT FL250.

Narrative: I CLBED AN ACFT (ACR X) TO FL260; WHICH IS THE LOA-PRESCRIBED ALT; PRE-COORD FOR ACFT DEPARTING MDT GOING W TO ZOB AND REQUESTING FL260 OR ABOVE. THE ACFT WAS ONLY REQUESTING FL240 AND THAT WAS THE 'HARD' ALT WHICH WAS XFERRED IN THE DATA BLOCK TO THE ZOB CTLR. THE OTHER ACFT WAS XING PATHS AT FL250. THE ZOB CTLR TOOK ACTION TO STOP THE CLB BUT SEPARATION WAS LOST. SUPPLEMENTAL INFO FROM ACN 669352: ACR X (THE CRJ1) CHKED ON CLBING WBOUND ON J80 OUT OF FL195 FOR FL260. ACR X'S DATA BLOCK SHOWED FL240 AS THE FINAL ALT. ACFT Y WAS NEBOUND AT FL250. I THOUGHT ACR X STATED HE WAS CLBING TO FL240. ACR X WAS CLBING SO SLOWLY THAT HIS DATA BLOCK SHOWED HIM LEVEL AT FL240 FOR OVER 45 SECONDS. WHEN THE DATA BLOCK SHOWED HIM ABOVE FL240; ACR X WAS ALREADY WITHIN 5 MI OF ACFT Y. I ASKED ACR X TO CONFIRM LEVEL AT FL240. HE SAID NEGATIVE; HE WAS CLBING TO FL260. I TURNED ACR X L TO A HDG OF 180 DEGS AND HAD HIM DSND BACK TO FL240. ONCE ACR X REACHED FL240; I RECLRED HIM ON COURSE. THE CTLR IN ZNY FROM WHOM I RECEIVED THE HDOF ON ACR X CONFIRMED THAT HE CLRED THE ACFT TO FL260 EVEN THOUGH FL240 WAS THE REQUESTED FINAL ALT.

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.