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A lead maintenance technician reported a process failure where propeller blades were installed in the incorrect position during build-up; resulting in vibration when the assembly was installed on an aircraft.
| Attributes | |
| ACN | 1304978 |
| Time | |
| Date | 201510 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Propeller Assembly |
| Person 1 | |
| Function | Lead Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
I was the lead mechanic for a propeller build-up during which #2 and #4 blades were swapped. When the prop was finally put on a plane a month later; the airplane experienced excessive vibration. This is when the prop was inspected and found that blades were installed in the wrong locations. I think the blades were installed improperly because too many people were involved in the build-up. Blades #1 and #3 were installed first so I think we just got confused as to which side #2 went on. Inevitably after installing #2 incorrectly; then #4 would also be incorrect. I think we also failed to double-check our work like we did when installing #1 blade.
Original NASA ASRS Text
Title: A lead Maintenance Technician reported a process failure where propeller blades were installed in the incorrect position during build-up; resulting in vibration when the assembly was installed on an aircraft.
Narrative: I was the lead mechanic for a propeller build-up during which #2 and #4 blades were swapped. When the prop was finally put on a plane a month later; the airplane experienced excessive vibration. This is when the prop was inspected and found that blades were installed in the wrong locations. I think the blades were installed improperly because too many people were involved in the build-up. Blades #1 and #3 were installed first so I think we just got confused as to which side #2 went on. Inevitably after installing #2 incorrectly; then #4 would also be incorrect. I think we also failed to double-check our work like we did when installing #1 blade.
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.