# SDR CALA2019070801156

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2019
- Submitted: July 8, 2019
- Operation: Air carrier
- Aircraft: [N37281](https://openairdocs.org/aircraft/N37281), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31599
- Aircraft time: 51,747 hours, 18,383 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Check Valve
- Part number: 652567421
- Condition: Loose
- Location: Ac System
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2019070801156

## Discrepancy

AIRCRAFT DID NOT PRESSURIZE DURING CLIMBOUT FOUND GROUND AIR CONDITIONING CHECK VALVE LOOSE, SECURED VALVE AND PRESSURIZED AIRPLANE TO 3. ALL NORMAL AND PRESSURE LEAK CHECK GOOD. REF AMM 05-51-91.

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