# SDR ASAA2023080744475

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 7, 2023
- Submitted: August 9, 2023
- Operation: Air carrier
- Aircraft: [N984AK](https://openairdocs.org/aircraft/N984AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67499
- Aircraft time: 256 hours, 82 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 2123010BA
- Part serial: 23210013
- Condition: Malfunctioned
- Location: Cabin Pressure
- Part time: 257 hours, 83 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023080744475

## Discrepancy

AUTO FAIL AND ALTN LIGHTS ILLUMINATED DURING FLIGHT AT FL400 APPROX 40 MIN INTO FLIGHT - NON ETOPS VERIFICATION NOT SUCCESSFUL. GROUNDED - YES. REMOVED AND REPLACED AFT OUTFLOW VALVE ASSEMBLY IAW B737-9MAX-AMM 21-31-03-000-801 & 21-31-03-400-801 OPS CHECKS GOOD.

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