# SDR USAA2014031800008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 17, 2014
- Submitted: March 18, 2014
- Operation: Air carrier
- Aircraft: N550UW
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4935
- Aircraft time: 8,790 hours, 3,029 cycles
- System (JASC): [3510 · Crew Oxygen System](https://openairdocs.org/jasc/3510)
- Part: Selector Knob
- Part number: MF20534
- Part serial: SE62357
- Condition: Broken
- Location: O2 Mask
- Part time: 8,783 hours, 3,026 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2014031800008

## Discrepancy

RIGHT HAND FLIGHT DECK OBSERVER`S MASK EMERGENCY SELECTOR KNOB BROKEN.  REPLACED FLIGHT DECK OBSERVER`S MASK IAW AMM 35-12-41.

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