# SDR DALA2022040402264

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2022
- Submitted: April 4, 2022
- Operation: Air carrier
- Aircraft: [N589NW](https://openairdocs.org/aircraft/N589NW), registered now
- Make and model: Boeing 757351
- Aircraft serial: 32989
- Aircraft time: 66,191 hours, 21,563 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: None
- Condition: None
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2022040402264

## Discrepancy

SHIP 5809 - PRES - EMERGENCY DESCENT DUE TO LOSS OF PRESSURIZATION. FLIGHT CONTINUED TO DESTINATION. CORRECTIVE ACTION: REPLACED RELAYS K21 AND K10646. MTC FOUND LT HIGH STAGE VALVE STICKING. REPLACED HIGH STAGE VALVE, FAN AIR TEMP SENSOR, AND REVERSE CONTROLLER. C/W NO-GO PROCEDURES.

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