# SDR MYWA110078

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2011
- Submitted: July 25, 2011
- Operation: Air carrier
- Aircraft: [N734MA](https://openairdocs.org/aircraft/N734MA), registered now
- Make and model: Boeing 737-8Q8
- Registry model: [Boeing 737-8Q8](https://openairdocs.org/model/boeing-737-8q8) (OpenAirDocs)
- Aircraft serial: 30039
- Aircraft time: 28,818 hours, 10,309 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- 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/MYWA110078

## Discrepancy

ETOPS SIGNIFCANT SYSTEM:  CABIN ALT WARNING SOUNDED WHILE CLIMBING OUT OF FL250.  CABIN ALT WAS APPROX 13,000FT PUT PRESSURIZATION MODE CONTROL PANEL TO MANUAL AND OUT FLOW VALVE TO CLOSE AND STARTED A DESCENT AT FL200 CABIN ALT WAS AT 9000 AND STOPPED THE DESCENT.  CABIN ALT SLOWLY RETURNED TO NORMAL FOR FL200 AND CONTINUED FLIGHT TO DESTINATION.  PERFORMED BITE CHECK ON DPCU 1 & 2 SYSTEM OK NO FAULTS FOUND AT THIS TIME IAW FIM 21-31 TASK 801.

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