# SDR CALA2026100820232

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 5, 2026
- Submitted: October 8, 2026
- Operation: Air carrier
- Aircraft: [N77538](https://openairdocs.org/aircraft/N77538), registered now
- Make and model: Boeing 737824
- Aircraft serial: 63694
- Aircraft time: 30,223 hours, 11,587 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 2193301AD
- Part serial: 0895835
- Condition: Faulted
- Location: Cabin Pressure
- Part time: 58,508 hours, 21,427 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026100820232

## Discrepancy

CABIN PRESSURE  DIFF IS ABOVE LIMITS,  DESCENDED FROM FL 390 TO 350.   REMOVED AND REPLACED CPC NR 2 IAW AMM 21-31-01, OPS CHKD GOOD.  INSPECTED BOTH PACK BAYS FOR LEAKS, NONE NOTED. INSPECTED OUTFLOW VALVE AND OVER PRESSURE VALVES. NO DEFECTS NOTED.

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