# SDR 2007UALA03435

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2007
- Submitted: August 31, 2007
- Operation: Air carrier
- Aircraft: [N306UA](https://openairdocs.org/aircraft/N306UA), registered now
- Make and model: Boeing 737322
- Aircraft serial: 23667
- Aircraft time: 59,128 hours, 34,666 cycles
- Engine: Cfmint CFM563C1
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: B-Nut
- Condition: Leaking
- Location: Crew Oxygen Sys
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA03435

## Discrepancy

CREW COMMENTS:  CREW OXYGEN PSI DROPPED FROM 1900 TO 1600 PSI IN 2 HOURS.  LEAKING O2 AT B-NUT.   TIGHTENED B-NUT, REPLACED COCKPIT GAUGE AND RESTOWED ALL THREE MASKS PROPERLY.  NO REPEATS.

---
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.