An inspector and line mechanic report on their involvement with # 1 engine fan blade replacements on...

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.

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.

Attributes
ACN	837623
Time
Date	200905
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Fan Blade
Person 1
Function	Inspector
Qualification	Maintenance Airframe Maintenance Powerplant
Experience	Maintenance Technician 7.9
Person 2
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Experience	Maintenance Technician 9.6
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

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.