# SDR 2004UALA00156

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 21, 2004
- Submitted: March 2, 2004
- Operation: Air carrier
- Aircraft: N576UA
- Make and model: Boeing 757222
- Aircraft serial: 26690
- Aircraft time: 37,093 hours, 12,914 cycles
- Engine: Pwa PW2037
- System (JASC): [2780 · Leading Edge Slat Control System](https://openairdocs.org/jasc/2780)
- Part: Pdu
- Condition: Failed
- Location: Slats
- Stage of operation: CL
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004UALA00156

## Discrepancy

FLIGHT RETURNED TO FIELD WITH A LEADING EDGE SLAT DISAGREEMENT MESSAGE.  LEFT PDU TORQUE LIMITER TRIPPED. REPLACED LEFT LEADING EDGE POWER DRIVE UNIT.

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