# SDR AALA202503089000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2025
- Submitted: March 8, 2025
- Operation: Air carrier
- Aircraft: [N300UB](https://openairdocs.org/aircraft/N300UB), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 44506
- Aircraft time: 288 hours, 117 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 2193301AD
- Part serial: 24210696
- Condition: Faulted
- Location: Zone 100
- Part time: 289 hours, 118 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202503089000

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AN THE AIRCRAFT DIVERTED TO ATL DUE TO AUTO PRESSURIZATION FAILURE. THE AIRCRAFT LANDED SAFELY AT ATL.  AIRCRAFT WAS ON AN MEL FOR CABIN PRESSURE CONTROLLER #2 INOPERATIVE. MAINTENANCE REPLACED THE OUTFLOW VALVE PER AMM 21-31-03 (AALA202503086361) AND THE #2 CABIN PRESSURE CONTROLLER REF AMM 21-31-01 (AALA202503089000). ACCOMPLISHED SATISFACTORY LEAK AND OPERATIONAL CHECKS.

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