# SDR CALA2026102120481

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2026
- Submitted: October 21, 2026
- Operation: Air carrier
- Aircraft: [N33103](https://openairdocs.org/aircraft/N33103), registered now
- Make and model: Boeing 757224
- Aircraft serial: 27293
- Aircraft time: 121,049 hours, 25,979 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Condition: False Activation
- Location: Zone 900
- Stage of operation: DE
- 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/CALA2026102120481

## Discrepancy

LAV SMOKE CAUTION MSG DURING DESCENT, PASSING 16000. NO SMOKE OBSERVED. AFT LT LAV.  DEBRIEF CREW & THEY STATED DIDN'T SMELL OR SAW SMOKE IN CABIN OR LAV.  AMBER CAUTION EICAS MSG & SMOKE DETECTOR CHIME CAME ON INFLIGHT & ON GROUND. VISUALLY INSPECTED SMOKE DETECTORS & NO OBVIOUS FAULTS NOTED. NO EICAS MSG ILLUM AT  MOMENT. DURING REMOVAL OF SMOKE DETECTOR IN AFT LEFT LAV. FOUND MULTIPLE WIRES CHAFED EXPOSING COPPER. FOUND SMOKE DETECTOR TO NOT BE MAKING ALARM SOUND. REMOVED AND REPLACED SMOKE DETECTOR IN AFT LEFT LAV IAW AMM 26-14-01. OPS CHKD GOOD. NO FURTHER DEFECTS NOTED. ON INSPECTION OF WIRES, NOTED NO DAMAGED OR EXPOSED CONDUCTOR. ACCOMPLISHED INSULATION REPAIR IAW WDM 26-14-11-1, & SWPM 20-10-13.

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