Narrative:

Cpr X was on a vector around restr airspace when issued a clearance to phx via direct lidat J92 bld KARLO5 climb to and maintain FL290. Cpr X read back phx via direct lidat J92 bld KARLO2 climb to FL330. I caught the KARLO2 mistake but not the altitude mistake. Cpr X climbed towards a sbound air carrier Y at FL310, directly above.

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Original NASA ASRS Text

Title: CPR X CLB THROUGH OCCUPIED ALT HAD LTSS WITH ACR Y. SYS ERROR.

Narrative: CPR X WAS ON A VECTOR AROUND RESTR AIRSPACE WHEN ISSUED A CLRNC TO PHX VIA DIRECT LIDAT J92 BLD KARLO5 CLB TO AND MAINTAIN FL290. CPR X READ BACK PHX VIA DIRECT LIDAT J92 BLD KARLO2 CLB TO FL330. I CAUGHT THE KARLO2 MISTAKE BUT NOT THE ALT MISTAKE. CPR X CLBED TOWARDS A SBOUND ACR Y AT FL310, DIRECTLY ABOVE.

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.