# SDR 2007UALA01059

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2007
- Submitted: April 17, 2007
- Operation: Air carrier
- Aircraft: N584UA
- Make and model: Boeing 757222
- Aircraft serial: 26706
- Aircraft time: 46,504 hours, 16,057 cycles
- Engine: Pwa PW2037
- Engine time: 46,220 hours, 16,368 cycles
- System (JASC): [7210 · Turbine Engine Reduction Gear](https://openairdocs.org/jasc/7210)
- Part: Bearing
- Condition: Failed
- Location: Gearbox
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA01059

## Discrepancy

FLIGHT LANDED UNDER AMBER ALERT DUE TO ENGINE SHUT-DOWN ON FINAL.  [SUP 05-24-07] THIS OCCURRENCE WAS DUE TO ANGLE GEARBOX BEARING FAILURE CAUSED BY EXCESSIVE VIBRATORY STRESS.  THIS IS BELIEVED TO HAVE BEEN THE RESULT OF AN IMPROPER BALANCING OF THE LOWER TOWER SHAFT WHICH COULD HAVE OCCURRED DURING INITIAL STAGE OF MANUFACTURE AT THE OEM.

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