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A line mechanic reports finding main tire/wheel assemblies with split or missing tie-bolt lock nuts on their B757-200 aircraft. Hydrogen embrittlement of lock nuts were noted as the cause of earlier failures and thought corrected; but now; similar failures are recurring.
| Attributes | |
| ACN | 1066342 |
| Time | |
| Date | 201302 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Main Gear Wheel |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 25 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR |
Narrative:
[This is in] reference air carrier maintenance computer system; item XXX01; on a B757-200 aircraft. One of the # 5 main wheel tie bolts had a broken nut. This is a recurring problem. About five years ago; we had problems with the tie-bolts breaking; now it is the nuts. Part failure of main tire/wheel tie-bolt lock nuts.
Original NASA ASRS Text
Title: A Line Mechanic reports finding main tire/wheel assemblies with split or missing tie-bolt lock nuts on their B757-200 aircraft. Hydrogen Embrittlement of lock nuts were noted as the cause of earlier failures and thought corrected; but now; similar failures are recurring.
Narrative: [This is in] reference Air Carrier Maintenance Computer System; Item XXX01; on a B757-200 aircraft. One of the # 5 main wheel tie bolts had a broken nut. This is a recurring problem. About five years ago; we had problems with the tie-bolts breaking; now it is the nuts. Part failure of main tire/wheel tie-bolt lock nuts.
Data retrieved from NASA's ASRS site as of July 2013 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.