# SDR WX0A2015061072650

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2015
- Submitted: June 10, 2015
- Operation: Air carrier
- Aircraft: N420NV
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 49424
- Aircraft time: 59,313 hours, 51,151 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 21171802
- Part serial: 591768
- Condition: Faulty
- Location: Cabin Pressure
- 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/WX0A2015061072650

## Discrepancy

NON-REVENUE FLIGHT, DURING CLIMB OUTFLOW VLV OSCILLATED CONTINUOUSLY FROM CLOSED TO HALF OPEN.  PERFORMED CABIN PRESS ERRATIC CHECKLIST.  PRESSURIZATION RETURNED TO NORMAL ON STDBY PRESSURIZATION CONTROLLER.  R & R NR 1 CABIN PRESS CONTROLLER IAW 21-32-00.  LEAK & OPERATIONS CHECK & OPERATIONS CHECKED GOOD IAW 34-11-00.

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