# SDR 2007UALA04519

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2007
- Submitted: November 1, 2007
- Operation: Air carrier
- Aircraft: [N171UA](https://openairdocs.org/aircraft/N171UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 24322
- Aircraft time: 69,190 hours, 8,377 cycles
- Engine: Pwa PW4056
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: MC1019151
- Condition: Faulty
- Location: Cockpit
- Stage of operation: IN
- How discovered: C
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA04519

## Discrepancy

FIRST OFFICERS O2 MASK, WHILE IN EMERGENCY MODE O2 FLOW "CHOO CHOO'S".  SUSPECT FAULTY FLOW VALVE. REPLACED MASK PER MM 35-11 -18 OPS CHECKS NORMAL. AC OK FOR SERVICE.


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