Narrative:

I was working on #2 engine replacing the eec and working on an engineering callout. The person I was working with missing reading the last part of the engineering callout that said to blow out water from eec to EPR probes. I open the fan cowls to replace the eec but I did not open the core cowls for the probes. On the next flight I was told the core cowls got damaged. I do not recall anyone opening the core on that engine. I was working on eec on overtime after my normal shift so it had been a long day and I had been dealing with a lot of stress from problems with my kids and my wife. To correct situation I would take a long break between shifts and read the paperwork at the same time. Callback conversation with reporter revealed the following information: reporter stated the requirement to blow out water accumulation that may have collected in the PT2 EPR inlet probe line to the new eec unit was never accomplished as called out for in the engineering procedures. This was due to a misread by his fellow mechanic. However; the engine core cowls were damaged in flight. Reporter does not know if the core cowls completely unlatched and opened on takeoff; on landing; or just unlocked; but were still damaged.

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Original NASA ASRS Text

Title: A B767-300 MECH DESCRIBES EVENTS SURROUNDING THE REPLACEMENT OF THE #2 ENGINE EEC AND THE SUBSEQUENT DAMAGE OF THE ENGINE CORE COWLS.

Narrative: I WAS WORKING ON #2 ENG REPLACING THE EEC AND WORKING ON AN ENGINEERING CALLOUT. THE PERSON I WAS WORKING WITH MISSING READING THE LAST PART OF THE ENGINEERING CALLOUT THAT SAID TO BLOW OUT WATER FROM EEC TO EPR PROBES. I OPEN THE FAN COWLS TO REPLACE THE EEC BUT I DID NOT OPEN THE CORE COWLS FOR THE PROBES. ON THE NEXT FLT I WAS TOLD THE CORE COWLS GOT DAMAGED. I DO NOT RECALL ANYONE OPENING THE CORE ON THAT ENG. I WAS WORKING ON EEC ON OVERTIME AFTER MY NORMAL SHIFT SO IT HAD BEEN A LONG DAY AND I HAD BEEN DEALING WITH A LOT OF STRESS FROM PROBS WITH MY KIDS AND MY WIFE. TO CORRECT SITUATION I WOULD TAKE A LONG BREAK BTWN SHIFTS AND READ THE PAPERWORK AT THE SAME TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE REQUIREMENT TO BLOW OUT WATER ACCUMULATION THAT MAY HAVE COLLECTED IN THE PT2 EPR INLET PROBE LINE TO THE NEW EEC UNIT WAS NEVER ACCOMPLISHED AS CALLED OUT FOR IN THE ENGINEERING PROCEDURES. THIS WAS DUE TO A MISREAD BY HIS FELLOW MECHANIC. HOWEVER; THE ENGINE CORE COWLS WERE DAMAGED IN FLIGHT. REPORTER DOES NOT KNOW IF THE CORE COWLS COMPLETELY UNLATCHED AND OPENED ON TKOF; ON LANDING; OR JUST UNLOCKED; BUT WERE STILL DAMAGED.

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.