# SDR AT0000485

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2000
- Submitted: December 8, 2000
- Operation: Air carrier
- Aircraft: [N825AT](https://openairdocs.org/aircraft/N825AT), registered now
- Make and model: Doug DC-9-32
- Registry model: [Doug DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32) (OpenAirDocs)
- Aircraft serial: 47319
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Regulator
- Part number: 90000200721
- Part serial: 716
- Condition: Inoperative
- Location: Pax Oxygen
- Stage of operation: CL
- 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/AT0000485

## Discrepancy

PASSING THROUGH 260FL, FIRST OFFICER HEARD SURGE FROM PAX O2 SYSTEM.  ALL MASKS DEPLOYED.  CABIN ALTITUDE WAS AT 7000FT.  REMOVED AND REPLACED PAX O2 CYLINDER REGULATOR.  IAW DC9 MM35-20

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