# SDR MTNA20210723001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2021
- Submitted: July 26, 2021
- Operation: Air carrier
- Aircraft: [N914FX](https://openairdocs.org/aircraft/N914FX), registered now
- Make and model: Aerosp ATR 42-300
- Registry model: [Aerosp ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (OpenAirDocs)
- Aircraft serial: 293
- Aircraft time: 27,564 hours, 29,680 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Bottle
- Part number: 89131114
- Part serial: M502226
- Condition: Leaking
- 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/MTNA20210723001

## Discrepancy

DURING SERVICING OF O2 CYLINDER, IT WAS DISCOVERED THAT A LOUD STREAM OF AIR WAS ESCAPING FROM SMALL HOLE IN BACK OF CYLINDER VALVE NECK. REMOVED AND REPLACED O2 CYLINDER. PERFORMED LEAK CHECK WITH NO LEAKS DETECTED.

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