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An engine shop mechanic questions inspections requirements for B737-700 engine mounts for CFM56-7 engines that do not follow B737-300/500 12K hour inspections. Reporter has found worn bushings; bearings and pawl pins at two years of service.
| Attributes | |
| ACN | 979485 |
| Time | |
| Date | 201111 |
| 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 | Powerplant Mounting |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Being in a position to build-up and tear down and monitor engine mount wear; I have concerns about excessive amounts of wear in engine mounts on bushings (worn and migrated); bearings and pawl pins on high time engines at (front and rear mounts).
Original NASA ASRS Text
Title: An Engine Shop Mechanic questions inspections requirements for B737-700 engine mounts for CFM56-7 engines that do not follow B737-300/500 12K hour inspections. Reporter has found worn bushings; bearings and pawl pins at two years of service.
Narrative: Being in a position to build-up and tear down and monitor engine mount wear; I have concerns about excessive amounts of wear in engine mounts on bushings (worn and migrated); bearings and pawl pins on high time engines at (front and rear mounts).
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.