# SDR ASAA2023110446014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 2023
- Submitted: November 7, 2023
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 56,786 hours, 16,639 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: LD
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023110446014

## Discrepancy

UPON LANDING, PRESSURIZATION SYSTEM DID NOT OPEN THE OUTFLOW VALVE TO DEPRESSURIZE THE AIRCRAFT. GROUNDED - YES. BOTH CONTROLLERS, PERFORMED DCPC BITE REF FIM 21-31 TASK 801. NO EXISTING FAULTS NOTED. NO FAULTS NOTED ON INBD FL OR PREVIOUS ONE. GROUND TEST BITE PASSES BOTH CONTROLLERS.

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