Narrative:

I was performing a fuel pump package right/right (remove/replace) on a B737-300 aircraft; number two engine. On the installation portion of the package; I removed the five bolts securing the drive pad cover and removed the cover to gain access to the agb (accessory gearbox). I used an extension and a 3/4' inch drive adapter to rotate the gearbox to align the fuel pump shaft. The alignment was successful; the package was aligned and then proceeded to torque the quad ring per amm (aircraft maintenance manual). Afterwards I removed my extension from the gearbox and installed it in my toolbox. Apparently the adapter had separated from the extension; unaware of this I prepared the cover for installation and proceeded to install.I am very consciously observant to small details and I did not observe any problems installing the cover. It seated fine and torqued fine so I safety wired the hardware. The complete job went very smoothly; and my mental checklist was very satisfied; even the completed leak checks were good. I was notified by my manager of maintenance that an event had occurred with aircraft #2 engine with an 'in-flight shutdown' due to loss of oil pressure.he briefly began to explain what happened and asked me if I removed the gearbox cover to rotate for alignment and I said 'yes.' he then explained in more detail and that's when my heart sank. Grateful and relieved that the aircraft had landed safely with no injuries; I told him what happened. I can't explain why I was not aware of the adapter remaining in the gearbox; and with no excuses. On our engine borescopes; the extension is one solid chrome 3/4' inch piece and that may have been programmed into me. My extension was chrome as well as the company's; my adapter was black; similar color to the gearbox and that might have had factor in not observing it. The amm just says use a 3/4' inch drive to turn the drive pad; with no exceptions to adapters. I am very saddened this event took place; I consider myself a very safe and conscientious worker and I'm the sole person responsible for this event.

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Original NASA ASRS Text

Title: A Line Mechanic reports a B737-300 experienced an in-flight shutdown due to loss of #2 engine oil pressure. Mechanic did not notice his 3/4' inch adapter had remained in the CFM-56 engine AGB (Accessory Gearbox) drive pad after he replaced the (Main Engine Control) MEC and engine fuel pump.

Narrative: I was performing a Fuel Pump package R/R (Remove/Replace) on a B737-300 aircraft; number two engine. On the installation portion of the package; I removed the five bolts securing the drive pad cover and removed the cover to gain access to the AGB (Accessory Gearbox). I used an extension and a 3/4' inch drive adapter to rotate the gearbox to align the fuel pump shaft. The alignment was successful; the package was aligned and then proceeded to torque the quad ring per AMM (Aircraft Maintenance Manual). Afterwards I removed my extension from the gearbox and installed it in my toolbox. Apparently the adapter had separated from the extension; unaware of this I prepared the cover for installation and proceeded to install.I am very consciously observant to small details and I did not observe any problems installing the cover. It seated fine and torqued fine so I safety wired the hardware. The complete job went very smoothly; and my mental checklist was very satisfied; even the completed leak checks were good. I was notified by my Manager of Maintenance that an event had occurred with aircraft #2 engine with an 'In-flight Shutdown' due to loss of oil pressure.He briefly began to explain what happened and asked me if I removed the gearbox cover to rotate for alignment and I said 'yes.' He then explained in more detail and that's when my heart sank. Grateful and relieved that the aircraft had landed safely with no injuries; I told him what happened. I can't explain why I was not aware of the adapter remaining in the gearbox; and with no excuses. On our engine borescopes; the extension is one solid chrome 3/4' inch piece and that may have been programmed into me. My extension was chrome as well as the company's; my adapter was black; similar color to the gearbox and that might have had factor in not observing it. The AMM just says use a 3/4' inch drive to turn the drive pad; with no exceptions to adapters. I am very saddened this event took place; I consider myself a very safe and conscientious worker and I'm the sole person responsible for this event.

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.