# SDR DALA2023112709695

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 24, 2023
- Submitted: November 27, 2023
- Operation: Air carrier
- Aircraft: [N554NW](https://openairdocs.org/aircraft/N554NW), registered now
- Make and model: Boeing 757251
- Aircraft serial: 26501
- Aircraft time: 59,876 hours, 26,790 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: B, A, I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2023112709695

## Discrepancy

SHIP 5654 -DIV/PRES/DE- UNABLE TO MAINTAIN CABIN PRESSURE, PERFORMED AN EMERGENCY DESCENT. CORRECTIVE ACTION: T/S R/R THE CPC 1, EQUIPMENT OVERBOARD VALVE, CABIN SELECTOR PANEL, CABIN OUTFLOW VALVE AND REMOVED AND INSTALLED DUCT "Y" ASSY AND ELBOW. C/W NO GO ODI PREVENTION PROGRAM, EXCESSIVE CABIN PRESSURE LEAKAGE TEST AND SINGLE PACK PRESSURIZATION CONFIDENCE CHECK. ALL TEST PASSED.

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