# SDR 2008UALA00974

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 21, 2008
- Submitted: February 26, 2008
- Operation: Air carrier
- Aircraft: N907UA
- Make and model: Boeing 737522
- Aircraft serial: 25007
- Aircraft time: 47,015 hours, 29,716 cycles
- Engine: Cfmint CFM563C1
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: B-Nut
- Condition: Loose
- Location: Crew O2
- Stage of operation: IN
- How discovered: V
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2008UALA00974

## Discrepancy

PREFLIGHT O2 SHOWS 400 PSI.  REPLACED MASK AND SECURED B-NUT NO LEAKS FOUND. AC OK FOR SERVICE.

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