# SDR 99UAL900672

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 1999
- Submitted: October 9, 2000
- Operation: Air carrier
- Aircraft: [N774UA](https://openairdocs.org/aircraft/N774UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26936
- Aircraft time: 16,267 hours, 3,979 cycles
- Engine: Pwa PW4077
- System (JASC): [2760 · Drag Control System](https://openairdocs.org/jasc/2760)
- Part: Pcu
- Part number: B435413
- Part serial: 0341
- Condition: Failed
- Location: Ailerons
- Part time: 16,267 hours, 3,979 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900672

## Discrepancy

RIGHT OUTBORAD SPOILER (NR 14) IN THE DEPLOYED POSITION.  AILERONS REQUIRE ONE UNIT OF TRIM.  *S/D*  MAINTENANCE MESSAGE 27-11513 SPOILER PCU NR 14 POSTION TRANSDUCER HAS FEEDBACK FAULT WAS ACTIVE.  SPOILER PCU NR 14 (P/N:  B43541-3) WAS REPLACED AND TESTED PER AMM 27-61-08.  SUSPECT A FAILURE OF THE POSITION TRANSDUCER LVDT AND POTTING COMPOUND.  THIS IS A SUBJECT OF A VENDER SERVICE BULLETIN AND THE MODFICATION WILL BE ACCOMPLISHED.

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