Narrative:

On the morning of jun/fri/03, 3 circuit breakers were left tagged with 'do not reset' tags for a l-hand ground temperature cooling fan on an MD83 aircraft. During the shift the cooling fan was replaced because of a failure noted by an in-flight MEL. The cooling fan was operations check by myself and another mechanic, for operation and leaks. The cooling fan past the operations check and leak check, which I conducted in the aft section of the aircraft. The other mechanic monitored the system from the flight deck. The system still showed an overheat indication, and was placed on a l-hand pack MEL. Since the cooling fan was operation when I conducted my test I proceeded to clear that MEL from the system. I was later informed by my supervisor the following evening the tags were found by the flight crew on approach to ZZZ after a r-hand pack problem not related since the l-hand was on MEL. I assumed that when I left the aircraft the l-hand cooling fan was operation that all tags and brakes were pulled and reset, I was wrong. I should have also did a scan of all circuit breakers before leaving the aircraft just to make sure. The aircraft was delayed for almost an hour for the completion of this work, which caused us to rush and thoroughly communicate the entire situation. The system was supposed to be checked in ZZZ1 and according to my supervisor found to be ok. The brakes were reset, and the aircraft was operational when I last checked.

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Original NASA ASRS Text

Title: AN MD80 WAS DISPATCHED IN NON COMPLIANCE WITH A L PACK DEFERRED ITEM REPAIRED BUT THE PACK CIRCUIT BREAKERS WERE NOT RESET AFTER REPAIR.

Narrative: ON THE MORNING OF JUN/FRI/03, 3 CIRCUIT BREAKERS WERE LEFT TAGGED WITH 'DO NOT RESET' TAGS FOR A L-HAND GND TEMP COOLING FAN ON AN MD83 ACFT. DURING THE SHIFT THE COOLING FAN WAS REPLACED BECAUSE OF A FAILURE NOTED BY AN INFLT MEL. THE COOLING FAN WAS OPS CHK BY MYSELF AND ANOTHER MECH, FOR OP AND LEAKS. THE COOLING FAN PAST THE OPS CHK AND LEAK CHK, WHICH I CONDUCTED IN THE AFT SECTION OF THE ACFT. THE OTHER MECH MONITORED THE SYS FROM THE FLT DECK. THE SYS STILL SHOWED AN OVERHEAT INDICATION, AND WAS PLACED ON A L-HAND PACK MEL. SINCE THE COOLING FAN WAS OP WHEN I CONDUCTED MY TEST I PROCEEDED TO CLR THAT MEL FROM THE SYS. I WAS LATER INFORMED BY MY SUPVR THE FOLLOWING EVENING THE TAGS WERE FOUND BY THE FLT CREW ON APCH TO ZZZ AFTER A R-HAND PACK PROB NOT RELATED SINCE THE L-HAND WAS ON MEL. I ASSUMED THAT WHEN I LEFT THE ACFT THE L-HAND COOLING FAN WAS OP THAT ALL TAGS AND BRAKES WERE PULLED AND RESET, I WAS WRONG. I SHOULD HAVE ALSO DID A SCAN OF ALL CIRCUIT BREAKERS BEFORE LEAVING THE ACFT JUST TO MAKE SURE. THE ACFT WAS DELAYED FOR ALMOST AN HR FOR THE COMPLETION OF THIS WORK, WHICH CAUSED US TO RUSH AND THOROUGHLY COMMUNICATE THE ENTIRE SIT. THE SYS WAS SUPPOSED TO BE CHKED IN ZZZ1 AND ACCORDING TO MY SUPVR FOUND TO BE OK. THE BRAKES WERE RESET, AND THE ACFT WAS OPERATIONAL WHEN I LAST CHKED.

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.