# SDR CALA2026101220301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 9, 2026
- Submitted: October 12, 2026
- Operation: Air carrier
- Aircraft: [N15712](https://openairdocs.org/aircraft/N15712), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28783
- Aircraft time: 84,562 hours, 30,584 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997202AB
- Part serial: 40631997201AB
- Condition: Faulted
- Location: Zone 100
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026101220301

## Discrepancy

THIS IS A LEVEL"A" CHRONIC FOR AUTO FAIL LIGHT ILLUMINATED AND ALTN LIGHT ILLUMINATED. HAD SEVERAL LRU'S REPLACED DUE TO DECAY CHECK ISSUES.  BITE FAULTED CPC1 OFV OR WIRING.   CHANGED OUTFLOW VALVE AND TS WIRING TO OUTFLOW VALVE T/S IAW FIM 21-31 TASK 801. WIRING CHECKS GOOD, BETWEEN #1 PRESSURE CONTROLLER & CABIN PRESSURE.  OUTFLOW VALVE CONNECTOR D10732. GNDS AT D10732 ALSO CK. GOOD, IAW SSM 21-31-22-101. R & R OUTFLOW VALVE IAW AMM 21-32-01, OPS CHECKED GOOD.

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