# SDR DALA2026091305113

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 12, 2026
- Submitted: September 14, 2026
- Operation: Air carrier
- Aircraft: [N351NW](https://openairdocs.org/aircraft/N351NW), registered now
- Make and model: Airbus A320-212
- Registry model: [Airbus A320-212](https://openairdocs.org/model/airbus-industrie-a320-212) (OpenAirDocs)
- Aircraft serial: 766
- Aircraft time: 82,406 hours, 39,011 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Microphone
- Part number: MF100511
- Part serial: B161202
- Condition: Inoperative
- Location: Oxygen Mask
- Part time: 16,963 hours, 7,407 cycles
- 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/DALA2026091305113

## Discrepancy

F/O OS MASK MICROPHONE NOT WORKING. C/A: SWAPPED THIRD OBSERVER SEAT OT MASK WITH F/O AND FWD THIRD OBSERVER SAET TO MEL 25-11-07. R/R THIRD OBESERVER O2 MASK PER A320 AMM 35-12. LEAK AND OPS TESTS OK. RFID INDUCTION C/W. F/O MASK RFID REPLACEMENT C/W TO REFLECT PART INSTALLED. REF TOPP 20-20-31. MEL PROC. REVERSED. MEL/PLAC. REMOVED. (LP: 9494826, AIRCRAFT WAS GROUNDED)

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