# SDR MTNA20211005001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 5, 2021
- Submitted: October 7, 2021
- Operation: Air carrier
- Aircraft: [N915FX](https://openairdocs.org/aircraft/N915FX), 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: 269
- Aircraft time: 27,667 hours, 31,743 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Bottle
- Part number: 89131114
- Part serial: C11020749
- Condition: Grooved
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MTNA20211005001

## Discrepancy

THE OXYGEN CYLINDER VALVE WAS FOUND TO HAVE A GROOVE AT THE REGULATOR CONNECTION CAUSING AN OXYGEN LEAK. MAINTENANCE REPLACED THE OXYGEN CYLINDER/VALVE ASSEMBLY WITH A SERVICEABLE UNIT. THE LAST HYDROSTATIC INSPECTION/OVERHAUL OF THE DEFECTIVE UNIT WAS PERFORMED ON 5/13/2019. THE NEXT OVERHAUL DUE IS 5/13/2022

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