# SDR ASAA2020101133338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 11, 2020
- Submitted: October 13, 2020
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 24,853 hours, 8,023 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997201AA
- Part serial: 9719793
- Condition: Failed
- Location: Cabin Pressure
- Part time: 23 hours, 6 cycles
- 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/ASAA2020101133338

## Discrepancy

GOT AUTOFAIL LIGHT ON CLIMB OUT AROUND 10,000.  GROUNDED-YES.  REMOVED AND REPLACED AFT OUT FLOW VALVE ASSEMBLY, IN REF TO B737-900 AMM 21-31-03.  OPERATIONS CHECK NORMAL THIS CLEARS MEL 21-14C.  PUSH IN BREAKER ON P6-4 AUTO 1 BREAKER C/N 10039457 SEAM C SCOTT NOTIFIED.  PLACARD REMOVED PERFORMED TEST OF MANUAL MODE AND CABIN PRESSURE CONTROL SYSTEM.  OPERATIONS CHECK GOOD, IN REF TO B737-900 AMM 21-31-00710-801 AND 21-31-00-700-802.

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