# SDR MTNA20250407002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2025
- Submitted: April 7, 2025
- Operation: Air carrier
- Aircraft: [N918FX](https://openairdocs.org/aircraft/N918FX), 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: 262
- Aircraft time: 30,921 hours, 39,022 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Oxygen Mask
- Part number: 174690M3
- Part serial: 20191
- Condition: No Test
- Location: Zone 200
- Part time: 30,287 hours, 38,646 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MTNA20250407002

## Discrepancy

DURING PREFLIGHT OF AIRCRAFT FOR FLIGHT 8120 BQN-AUA, THE CAPTAINS SIDE O2 MASK WOULD NOT TEST. BQN MAINTENANCE REPLACED THE CAPTAINS SIDE MASK AND FLIGHT 8120 DEPARTED

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