# SDR DL72W010991

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 16, 2001
- Submitted: June 26, 2001
- Operation: Air carrier
- Aircraft: [N831L](https://openairdocs.org/aircraft/N831L), registered now
- Make and model: Boeing 727-2Q8
- Registry model: [Boeing 727-2Q8](https://openairdocs.org/model/boeing-727-2q8) (OpenAirDocs)
- Aircraft serial: 21826
- Aircraft time: 65,018 hours, 44,185 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Bypass Valve
- Part number: AV13J5144
- Part serial: J45267
- Condition: Failed
- Location: T/E Flap
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL72W010991

## Discrepancy

ON FLAP RETRACTION LOST A-SYS HYD.  FOUND O/B FLAP BYPASS VALVE FAILED.  REMOVED AND REPLACED O/B FLAP BYPASS VALVE.

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