# SDR CALA2026020213492

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2026
- Submitted: February 2, 2026
- Operation: Air carrier
- Aircraft: [N27724](https://openairdocs.org/aircraft/N27724), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28791
- Aircraft time: 82,288 hours, 30,372 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 2193301AD
- Part serial: 23210626
- Condition: Faulted
- Location: Zone 100
- Part time: 1,002 hours, 407 cycles
- Stage of operation: CL
- 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/CALA2026020213492

## Discrepancy

CREW ADVISES AUTO PRESS FAIL LIGHT CAME ON AFTER TAKE OFF & MANUAL WOULD NOT OPERATE CORRECTLY.  ACP WIRE CHECKS BTWN CPC,CPM & OUTFLOW VALVE, NO DEFECTS FOUND IAW WDM 21-31-23 & WDM 2/1-31-22.  R & R AFT OUTFLOW VALVE ASSY IAW AMM 21-31-03,  STILL HAS AUTO FAIL LIGHT ON P5 PANEL.  FOUND CPC 1 FAULT CODE 002.  R & R CPC 1 IAW AMM 21-31-01, OPS CHKD GOOD.

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