# SDR UALA2011122107035

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2011
- Submitted: December 22, 2011
- Operation: Air carrier
- Aircraft: [N218UA](https://openairdocs.org/aircraft/N218UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30222
- Aircraft time: 45,518 hours, 5,557 cycles
- Engine: Pwa PW40903
- System (JASC): [2780 · Leading Edge Slat Control System](https://openairdocs.org/jasc/2780)
- Part: Control Valve
- Part number: 3930007102
- Part serial: 198
- Condition: Failed
- Location: Le Slat
- Stage of operation: NR
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011122107035

## Discrepancy

SLATS PRIMARY FAIL PRIMARY (HYDRAULIC) SLAT DRIVE FAILURE.  SLATS OPERATING IN SECONDARY (ELECTRICAL) MODE.  CAUTION MSG01- LATCHED DESCENT MODE DEPENDENT; SLATS MOVE WITHOUT COMMAND. DB- FSEU 1 MSG02- LATCHED DESCENT MODE DEPENDENT; SLATS MOVE WITHOUT COMMAND. MSG-2721021 LATCHD DC MODE. MSG-2721021 LATCHD DC MODE.  REPLACED SLAT PRIMARY CONTROL VLV WHICH IS BORROWED FROM S-CO PER MM.  OPS CHECKED OKAY.

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