# SDR AALA202304030317

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2023
- Submitted: April 3, 2023
- Operation: Air carrier
- Aircraft: [N970AN](https://openairdocs.org/aircraft/N970AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30096
- Aircraft time: 61,028 hours, 25,558 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Check Valve
- Part number: 69291425
- Condition: Faulty
- Location: Zone 100 - Fuse
- Stage of operation: CL
- 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/AALA202304030317

## Discrepancy

AIRCRAFT WAS GROUNDED: AIRCRAFT DID NOT PRESSURIZE ON CLIMB OUT. CABIN ALTITUDE WARNING AT 19,000 FEET. EMERGENCY DECLARED; FLIGHT RETURNED TO SJU LANDING SAFELY. MAINTENANCE REPLACED GROUND CONDITIONED AIR CHECK VALVE PER AMM 21-21-01-000-804-002 AND ACCOMPLISHED SATISFACTORY PRESSURIZATION SYSTEM GROUND TEST PER AMM 21-31-00.

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