# SDR CALA2026010612699

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 4, 2026
- Submitted: January 6, 2026
- Operation: Air carrier
- Aircraft: [N77871](https://openairdocs.org/aircraft/N77871), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 33526
- Aircraft time: 61,021 hours, 17,818 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Part number: 4755713
- Condition: False Activation
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026010612699

## Discrepancy

FWD LAV A FIRE ALARM WENT OFF IN CRUISE FOR 2 -3 MINUTES. NO SMOKE/FIRE INDICATIONS. STOPPED. VERIFIED NO INDICATIONS OF FIRE ON LAV A TRASH WAHL TEMP PLATE RECORDER. REPLACED SMOKE DETECTOR PER AMM 26-14-01-400-801-003 INSTALLATION SEL TEST PASSED PARTS USED:  60-2500-3-0009,QTY :1

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