# SDR UALA2013041102494

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 9, 2013
- Submitted: May 15, 2013
- Operation: Air carrier
- Aircraft: [N773UA](https://openairdocs.org/aircraft/N773UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26929
- Aircraft time: 71,466 hours, 13,557 cycles
- Engine: Pwa PW4077
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Check Valve
- Part number: 8102051
- Condition: Failed
- Location: Left
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2013041102494

## Discrepancy

FOUND LT BYPASS FAN AIR CHECK VALVE AND RUBBER BOOT BLOWN AND BROKEN.  REMOVED AND REPLACED BYPASS CHECK VALVE.  REPLACED BOOT, LEAK CHECKED GOOD.

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