# SDR 2003UALA00412

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 5, 2003
- Submitted: May 13, 2003
- Operation: Air carrier
- Aircraft: [N788UA](https://openairdocs.org/aircraft/N788UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26942
- Aircraft time: 26,577 hours, 4,126 cycles
- Engine: Pwa PW4090
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Flap
- Condition: Failed
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2003UALA00412

## Discrepancy

AIRCRAFT HAD FLAP DRIVE FAILURE INVOLVING PRIMARY AND SECONDARY SYSTEMS.  CENTER ACE WAS REPLACED AS PRECAUTIONARY.  DETAILED TESTS OF FLAP PRI CONTROL VALVE AND FLAP SECODARY MODES PASSED WITH NO FAULTS.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.