# SDR MTNA20230713001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 2023
- Submitted: July 17, 2023
- Operation: Air carrier
- Aircraft: [N810FX](https://openairdocs.org/aircraft/N810FX), registered now
- Make and model: Aerosp ATR72
- Aircraft time: 34,043 hours, 33,886 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: UK
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MTNA20230713001

## Discrepancy

CAPT'S O2 MASK FAILS PREFLIGHT CHECK IN 100% MODE. MASK WILL NOT PRSSURIZE. REMOVED AND REPLACED CAPT'S O2 MASK BOX. LEAK AND OPS CHECKED GOOD.

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