# SDR ASAA2019052839467

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2019
- Submitted: June 3, 2019
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 42,050 hours, 12,738 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997201AB
- Part serial: 9919755
- Condition: Faulted
- Location: Cabin Pressure
- Part time: 13,573 hours, 3,941 cycles
- Stage of operation: TX
- 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/ASAA2019052839467

## Discrepancy

WHILE PARKED AT GATE WITH ENGINES SHUT DOWN, MASTER CAUTION ILLUMINATED WITH AUTO FAIL & ALT MODE ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED AFT OUTFLOW VALVE ASSY IAW AMM 21-31-03/401. PRESSURIZATION SYSTEM MANUAL AND GROUND TEST TESTED GOOD.

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