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Three maintenance technicians reported that after engine run-up for vibration on a boeing 737-800; they noticed fan blade damage.
| Attributes | |
| ACN | 1540984 |
| Time | |
| Date | 201805 |
| Local Time Of Day | 1801-2400 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Fan Blade |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy Ground Event / Encounter FOD |
Narrative:
After accomplishing a vibe run; myself and coworker adjusted the weights on the hub. He was on the ground handing me the equipment. I was in the motor performing the work. After we made our first correction; we inspected the inlet and spinner hub for tools and FOD; packed up our tools; and went back to the vehicle to wait for the next run. The motor was run again (for a 2nd time). After the run/taxi crew completed the run; a second adjustment was required. After reentering the inlet of the motor; [coworker] handed me the torque wrench. It was then that we realized the hex drive tip was missing from the apex bit holder. Immediately; or at the same time; we realized the inlet section; along with multiple blades were damaged. After that; we can only hypothesize that the hex drive tip had worked itself loose and fallen off after completion of the work and (1) fell behind a blade preventing it from being seen or (2) had fallen on the ground while handing tools out of the engine to [coworker]. We can; without doubt; account that the tool was not stuck on the weight lug or in any readily visible portion of the inlet as I inspected the inlet and hub as I was leaving the work area (engine inlet).
Original NASA ASRS Text
Title: Three Maintenance Technicians reported that after engine run-up for vibration on a Boeing 737-800; they noticed fan blade damage.
Narrative: After accomplishing a vibe run; myself and coworker adjusted the weights on the hub. He was on the ground handing me the equipment. I was in the motor performing the work. After we made our first correction; we inspected the inlet and spinner hub for tools and FOD; packed up our tools; and went back to the vehicle to wait for the next run. The motor was run again (for a 2nd time). After the run/taxi crew completed the run; a second adjustment was required. After reentering the inlet of the motor; [coworker] handed me the torque wrench. It was then that we realized the hex drive tip was missing from the apex bit holder. Immediately; or at the same time; we realized the inlet section; along with multiple blades were damaged. After that; we can only hypothesize that the hex drive tip had worked itself loose and fallen off after completion of the work and (1) fell behind a blade preventing it from being seen or (2) had fallen on the ground while handing tools out of the engine to [coworker]. We can; without doubt; account that the tool was not stuck on the weight lug or in any readily visible portion of the inlet as I inspected the inlet and hub as I was leaving the work area (engine inlet).
Data retrieved from NASA's ASRS site 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.