# SDR CALA2025102010321

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 20, 2025
- Submitted: October 21, 2025
- Operation: Air carrier
- Aircraft: [N77571](https://openairdocs.org/aircraft/N77571), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67193
- Aircraft time: 7,764 hours, 2,598 cycles
- System (JASC): [5270 · Door Warning System](https://openairdocs.org/jasc/5270)
- Part: Sensor
- Condition: Dirty
- Location: Zone 800
- 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/CALA2025102010321

## Discrepancy

MAINT OVERHEAD LIGHT ON LANDING PICTURE UPDATE MAINTENANCE LIGHT OUT UPON ENTRY INTO COCKPIT. NON ACTIVE MAIN. MESSAGE 52-7111. CLEANED SENSORS ON FORWARD ENTRY DOOR. CYCLED DOOR TWICE WITH COCKPIT VERIFICATION OF DOOR CLOSED AND OPEN. NO PREVIOUS HISTORY.

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