# SDR MTNA20250805001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2025
- Submitted: August 5, 2025
- Operation: Air carrier
- Aircraft: [N910FX](https://openairdocs.org/aircraft/N910FX), 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: 277
- Aircraft time: 29,658 hours, 33,013 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Microphone
- Condition: No Test
- Location: Oxygen Mask
- 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/MTNA20250805001

## Discrepancy

PILOT OXYGEN MASK MICROPHONE HAS NO SOUND.  INSTALLED REPLACEMENT CAPTAINS O2 MASK IAW IAW STC STO1444SE DOCUMENT 3510-1 OPS CHECK GOOD.

---
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.