# SDR AALA202207053810

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 2022
- Submitted: July 5, 2022
- Operation: Air carrier
- Aircraft: [N807NN](https://openairdocs.org/aircraft/N807NN), registered now
- Make and model: Boeing 737
- Aircraft serial: 31077
- Aircraft time: 37,898 hours, 15,481 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator Valve
- Part number: 1074847
- Part serial: 18787
- Condition: Inoperative
- Location: Zone 400 - Nac/P
- Part time: 37,901 hours, 15,482 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: D, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202207053810

## Discrepancy

AIRCRAFT WAS GROUNDED: DEPARTED AUS, AFTER LEVEL OFF AT 24000 FT, FOUND WE COULD NOT COOL THE CABIN SUFFICIENTLY AND RETURNED TO AUS. REMOVED AND REPLACED HIGH STAGE REGULATOR PER JOB CARD 08L40036002. REMOVED AND REPLACED PRESSURE VALVE (AALA202207055589).

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