# SDR TWAA0010704

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2000
- Submitted: July 10, 2000
- Operation: Air carrier
- Aircraft: [N979Z](https://openairdocs.org/aircraft/N979Z), registered now
- Make and model: Doug DC-9-31
- Registry model: [Doug DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (OpenAirDocs)
- Aircraft serial: 47343
- Aircraft time: 74,621 hours, 85,861 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Valve
- Part number: 39613011
- Condition: Worn
- Location: Flow Control
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWAA0010704

## Discrepancy

LOST CABIN PRESSURIZATION AND PSU OXYGEN MASKS DEPLOYED.  REPLACED THE RT FLOW CONTROL VALVE.  CHECK-C 10-4-99 MCI.  ---CLOSED---

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