<< >> NASA ASRS Report 835855, May 2009

A mechanic reports he replaced the #4 engine oil scavenge pump on a B747-400; only to find out two days later; the same engine was shutdown in-flight; due to an incorrect o-ring installed with the scavenge pump.

Attributes
ACN	835855
Time
Date	200905
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oil Scavenge Pump
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Replaced #4 oil scavenge pump per maintenance manual (MM). Stayed beyond shift to finish the job. Received half of the o-rings required to do job with the new part and had to order the other half. Routine job; removed and replaced unit; ran engine for leak checks and found none. Two days later; I had heard that there was an engine shut down and I was asked to write a statement. After this; I went for my training and now have decided to file a report. It was reported that there was a wrong o-ring used in the installation and the engine was shut down in flight.

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Original NASA ASRS Text

Title: A Mechanic reports he replaced the #4 engine oil scavenge pump on a B747-400; only to find out two days later; the same engine was shutdown in-flight; due to an incorrect o-ring installed with the scavenge pump.

Narrative: Replaced #4 oil scavenge pump per maintenance manual (MM). Stayed beyond shift to finish the job. Received half of the o-rings required to do job with the new part and had to order the other half. Routine job; removed and replaced unit; ran engine for leak checks and found none. Two days later; I had heard that there was an engine shut down and I was asked to write a statement. After this; I went for my training and now have decided to file a report. It was reported that there was a wrong o-ring used in the installation and the engine was shut down in flight.

Data retrieved from NASA's ASRS site as of April 2012 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.