A Contract Mechanic reports he was involved in removing and replacing the # 5 Bearing oil lines on an A319; V2500 engine. The insulation blanket shroud around the oil cover plate was inadvertently not reinstalled.
Synopsis
A Contract Mechanic reports he was involved in removing and replacing the # 5 Bearing oil lines on an A319; V2500 engine. The insulation blanket shroud around the oil cover plate was inadvertently not reinstalled.
Narrative
I was involved in removing and replacing the #5 Bearing oil lines on an A319; V2500 engine during a Line overnight check. After removal (of the lines); I went inside and brought all my 'old' (removed) hardware with me. Another Mechanic then brought me out a tray of hardware that was ready for installation; as it was clean and Inspected. This tray included bolts; tubing; and insulation blankets. I began to reinstall the parts; but I didn't notice that this set was missing a piece. This claimed piece being an Insulation blanket that went around the #5 bearing cover plate. The job was then Inspected; closed up; Leak checked; and signed off. I put the red tag with the old (removed) parts and went home. The following week I get a call from my Coordinator asking me about the part; telling me they had found it. I told the truth and said I didn't have any extra parts. I also said if the tray was complete; as far as the parts were concerned... than it was on. He then asked me if I remember putting it on; I told him I did not.
NASA callback
Reporter stated he is a Contracted Mechanic for an air carrier that also employs their own Mechanics at the same station. He and other Contract Mechanics generally work on the air carrier's C-Check airplanes. That night they were short staffed on the Line and he was sent out to work with carrier Mechanics to remove and replace the #5 bearing oil pressure and scavenge lines inside the Exhaust Nozzle section. Working from a Service Bulletin; they soaked the removed oil lines in a solution that dissolves the caked-up (coked) oil inside the lines.Reporter stated instead of waiting for the solution to clean the removed oil lines; the air carrier set up a tray system where oil lines from another Airbus engine had already been replaced and the removed lines already cleaned. Included in the tray; would supposedly be all the removed lines and shroud insulation for the # 5 Bearing oil compartment to be reinstalled. Reporter stated they were working outside and the weather was very cold. He and the Inspector just overlooked the installation of the Insulation blanket around the closing cover plate for the oil compartment; which would normally be included in the tray of parts.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.