# SDR 99UAL900421

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N410UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 463
- Engine: Iae V2527A5
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Actuator
- Part number: SC47003
- Condition: Failed
- Location: Lt Yaw Damper
- Part time: 18,418 hours
- Stage of operation: CR
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900421

## Discrepancy

DIVERTED TO ATL DUE TO LOSS OF HYDRAULIC PRESSURE.  *S/D*  LT YAW DAMPER ACTUATOR DEVELOPED A PIN HOLE LEAK WHICH CAUSED THE HYD SYSTEM (GREEN) TO BLEED DOWN.  ACTUATOR (P/N SC4700-3), (S/N 5030), MR27258-1035.  ACTUATOR WAS REPLACED AND AIRCRAFT RETURNED TO SERVICE.

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