Narrative:

What happened as far as I can tell, is myself (xyz) and 2 other mechanics (abcd and XXXX) built up a CF6-6 high stage engine compressor. I had signed off stages 1-3-4-5-6. Abcd had signed off stage 2. What was found wrong was the wrong lever arms were installed on stage 2.I did not install any lever arms on stage 2 and I doubt abcd installed the wrong ones because he would have had to miss it. Inspection would have had to miss it, build-up would have had to miss it when they rigged that stage. Test cell would have had to miss it and it would have had to work correctly for a yr in the field, meaning thousands of flight hours. I believe someone in the field accidentally changed them when changing the outer vane seal, because of air leakage at the vane.

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Original NASA ASRS Text

Title: A DC10-10 ENG TYPE CF6-6 WAS DISCOVERED HAVING THE WRONG STATOR VANE LEVER ARMS INSTALLED IN COMPRESSOR STAGE 2.

Narrative: WHAT HAPPENED AS FAR AS I CAN TELL, IS MYSELF (XYZ) AND 2 OTHER MECHS (ABCD AND XXXX) BUILT UP A CF6-6 HIGH STAGE ENG COMPRESSOR. I HAD SIGNED OFF STAGES 1-3-4-5-6. ABCD HAD SIGNED OFF STAGE 2. WHAT WAS FOUND WRONG WAS THE WRONG LEVER ARMS WERE INSTALLED ON STAGE 2.I DID NOT INSTALL ANY LEVER ARMS ON STAGE 2 AND I DOUBT ABCD INSTALLED THE WRONG ONES BECAUSE HE WOULD HAVE HAD TO MISS IT. INSPECTION WOULD HAVE HAD TO MISS IT, BUILD-UP WOULD HAVE HAD TO MISS IT WHEN THEY RIGGED THAT STAGE. TEST CELL WOULD HAVE HAD TO MISS IT AND IT WOULD HAVE HAD TO WORK CORRECTLY FOR A YR IN THE FIELD, MEANING THOUSANDS OF FLT HRS. I BELIEVE SOMEONE IN THE FIELD ACCIDENTALLY CHANGED THEM WHEN CHANGING THE OUTER VANE SEAL, BECAUSE OF AIR LEAKAGE AT THE VANE.

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.