# SDR CA980417006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Airbus A320-211
- Registry model: [Airbus A320-211](https://openairdocs.org/model/airbus-industrie-a320-211) (OpenAirDocs)
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Condition: Failed
- Location: Cabin Press Sys
- Stage of operation: CR
- Nature of condition: O
- Precautionary procedure: B, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA980417006

## Discrepancy

(CAN) AFTER TAKEOFF, A/C OVERPRESSURIZED DUE TO FAULTY NR SYSTEM AND NR SYSTEM DID NOT TAKE CONTROL.   ALSO, DIFFICULTY ENCOUNTERED WITH MANUAL CONTROL.  CLIMB-OUT OF FLIGHT LEVEL 320 LOST CONTROL OF CABIN, FIRST DESCENDED, THEN FULL CLIMB AT 3,700 FEET PER MINUTE, CONTROL REGAINED, OK IN MANUAL.   A/C RETURNED TO DEPARTURE TERMINAL.  MAINTENANCE ACTION INVOLVED CHANGING OUT FLOW VALVE ASSEMBLY AND OPERATIONALLY CHECKED SERVICEABLE.

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