# SDR AALA202604143265

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2026
- Submitted: April 14, 2026
- Operation: Air carrier
- Aircraft: [N951NN](https://openairdocs.org/aircraft/N951NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33327
- Aircraft time: 35,015 hours, 14,557 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 2193301AC
- Part serial: 1196111
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202604143265

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKEOFF AUTOFAIL LIGHT ILLUMINATED, AIRCRAFT FAILED TO PRESSURIZE, ALTERNATE MODE INOPERATIVE AS WELL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT RDU. FOLLOWED FIM TASK 21-31-00-810-801. REMOVED AND REPLACED (CPC)-CABIN PRESSURE CONTROLLER (AALA202604145210), PER AMM 21-31-01. ALSO, REMOVED AND REPLACED CABIN PRESSURE CONTROL MODULE (AALA202604147063), PER AMM 21-31-02. ALL REQUIRED TEST ACCOMPLISHED NO FAULTS AND PRESSURIZED.

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