# SDR K11A2026090400388

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 4, 2026
- Submitted: September 4, 2026
- Operation: Air carrier
- Aircraft: [N403CK](https://openairdocs.org/aircraft/N403CK), registered now
- Make and model: Boeing 737-4Q8
- Registry model: [Boeing 737-4Q8](https://openairdocs.org/model/boeing-737-4q8) (OpenAirDocs)
- Aircraft serial: 26280
- Aircraft time: 60,985 hours, 37,326 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Controller
- Part number: 7638101
- Part serial: 73113060
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K11A2026090400388

## Discrepancy

AUTO FAIL LIGHT ON IN AIR, CABIN ALT NOT CONTROLLABLE IN MANUAL MODE.    REMOVED AND REPLACED PRESSURE CONTROLLER IAW AMM 21-31-21. CONTROLLER OPS CHECK PERFORMED IAW AMM 21-31-00 OPS TEST GOOD PERFORMED CABIN PRESSURE LEAK TEST IAW AMM 05-51-91, OPS CHECK GOOD NO LEAKS NOTED AT THIS TIME.

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