# SDR 9612405525

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 5, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N525US](https://openairdocs.org/aircraft/N525US), registered now
- Make and model: Boeing 757251
- Aircraft serial: 23619
- Engine: Pwa PW2037
- System (JASC): [7323 · Turbine Governor](https://openairdocs.org/jasc/7323)
- Part: Pma
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: CL
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9612405525

## Discrepancy

DURING CLIMB, THE NR 1 ENGINE OPERATING PARAMETERS BECAME ERRATIC.  AIRCRAFT RETURNED TO SFO AND LANDED WITHOUT FURTHER EVENT.  GROUND MAINTENANCE FOUND THE PERMANENT MAGNET ALTERNATOR HAD FAILED DUE TO A LOOSE PMA ROTOR SHAFT IN THE GEAR BOX.  MAIN GEAR BOX AND PMA WERE REPLACED.  AIRCRAFT WAS GROUND RUN AND FOUND SERVICEABLE.

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