# SDR SWAA990476

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 8, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N397SW](https://openairdocs.org/aircraft/N397SW), registered now
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 27691
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 71211997101AA
- Condition: Malfunctioned
- Location: E & E Bay
- Stage of operation: DE
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA990476

## Discrepancy

DURING DESCENT FROM 29,000 FT, AT 23,000 THE CABIN RATE WENT FROM 500 FPM TO 2000 FPM.  AT 20,000 FEET CABIN RATE WENT 500 FPM CLIMB, THEN SETTLED BACK TO 500 FPM DESCENT.  REMOVED AND REPLACED NR 2 PRESSURE CONTROLLER PER MM.

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