Narrative:

I reported to work on overtime for day shift. Upon arrival I was told that I would be the inspector for aircraft #1 engine fan blade change due to bird strike that occurred on the previous day; taking it out of service. I then got a turn over from the routine overnight inspector (ron) inspector; who showed me the maintenance manual references and maintenance task cards that were used and up to what step they got to. He also showed a card that required a sign off; after completed fan blade installation and engine run; after borescope. Inspected borescope. Two mechanics were working the blade installation; following step by step the maintenance manual references. I confirmed the new fan blade weights; with the fan blade plot paper work matched and also called maintenance control regarding spinner weights. I then inspected the fan blade platform pins per the maintenance manual task. (Which consisted of the fan blade retainer; mid flange of the fan disk; and forward flange of the booster spool?) I then stamped my number on four steps that were completed with per maintenance manual. The following steps were to install fan blades. I gave a turnover; since he was the inspector taking over; informing him that the two mechanics were following the maintenance manual and lubricating the blades and spacers per maintenance manual and that they had the ok to install. I went home. I was told later that aircraft had to divert due to high engine vibration.

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Original NASA ASRS Text

Title: An Inspector and Line Mechanic report on their involvement with # 1 engine fan blade replacements on a B737-700; after the aircraft had previously diverted for engine vibration from a bird strike.

Narrative: I reported to work on overtime for day shift. Upon arrival I was told that I would be the Inspector for aircraft #1 engine fan blade change due to bird strike that occurred on the previous day; taking it out of service. I then got a turn over from the Routine Overnight Inspector (RON) Inspector; who showed me the maintenance manual references and maintenance task cards that were used and up to what step they got to. He also showed a card that required a sign off; after completed fan blade installation and engine run; after borescope. Inspected borescope. Two Mechanics were working the blade installation; following step by step the maintenance manual references. I confirmed the new fan blade weights; with the fan blade plot paper work matched and also called Maintenance Control regarding spinner weights. I then inspected the fan blade platform pins per the maintenance manual task. (Which consisted of the fan blade retainer; mid flange of the fan disk; and forward flange of the booster spool?) I then stamped my number on four steps that were completed with per maintenance manual. The following steps were to install fan blades. I gave a turnover; since he was the Inspector taking over; informing him that the two mechanics were following the maintenance manual and lubricating the blades and spacers per maintenance manual and that they had the OK to install. I went home. I was told later that aircraft had to divert due to high engine vibration.

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.