# SDR K11A2026040400376

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2026
- Submitted: April 6, 2026
- Operation: Air carrier
- Aircraft: [N730CK](https://openairdocs.org/aircraft/N730CK), registered now
- Make and model: Boeing 737-4C9
- Registry model: [Boeing 737-4C9](https://openairdocs.org/model/boeing-737-4c9) (OpenAirDocs)
- Aircraft serial: 26437
- Aircraft time: 62,572 hours, 33,281 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 7638101
- Part serial: P8101
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K11A2026040400376

## Discrepancy

AT FL 310 CABIN ALTITUDE WARNING LIGHT ILLUMINATED AND HORN SOUNDED, FOLLOWED QUICK ACTIONS ITEMS DECLARED EMERGENCY, IMITATED DESCENT, CABIN PRESSURE WAS CONTROLLABLE IN MANUAL MODE BELOW FL 240. TRANSFERRED TO DMI #73000189 CAT C DUE 4/14/2026 IAW B737 KC2 MEL REF 21-14-1 SPECIAL PROCEDURES 21-14-01, REQUIRED PLACARDS INSTALLED. REF LP 737-004-1462 ITEM #2 R&R CABIN PRESSURE CONTROLLER IAW B737AMM 21-31-21, OPS CHECK GOOD IAW B737 AMM 21-31-00, THIS ACTION CLEARS DMI #73000189, PLACARDS REMOVED.

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