# SDR CA990416014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Boeing 737275
- Engine: Pwa JT8D9A
- System (JASC): [2722 · Rudder Actuator](https://openairdocs.org/jasc/2722)
- Part: Pcu
- Part number: 654486112
- Condition: Failed
- Location: Rudder
- Part time: 37,537 hours
- Stage of operation: CR
- Nature of condition: F, E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA990416014

## Discrepancy

(CAN) ON TWO OCCASIONS UNCOMMANDED YAW EXCURSIONS, ON CLIMB AND IN CRUISE.  BOTH TIMES THE YAW WAS QUITE PRONOUNCED AND OF SHORT DURATION, YAW TO RIGHT.  YAW DAMPER AND AUTOPILOT WERE ENGAGED.  RUDDER POWER CONTROL UNIT REPLACED.

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