# SDR UIEA2021013000153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2021
- Submitted: February 3, 2021
- Operation: Air carrier
- Aircraft: [N408MC](https://openairdocs.org/aircraft/N408MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29261
- Aircraft time: 85,740 hours, 14,385 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Part number: PU90461R1
- Part serial: J0463
- Condition: False Activation
- Location: Crew Rest
- 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/UIEA2021013000153

## Discrepancy

CREW REST SMOKE ALARM SOUNDED IN FLIGHT, NO SIGNS OF SMOKE.  CREW VERIFIED NO SMOKE OR FUMES AND SILENCED THE ALARM.  CONTINUED TO ANC THE SCHEDULED DESTINATION.  MX FOUND A BAD DETECTOR AND DEACTIVATED IT AND PLACED ON DEFERRAL NR 141651 IAW MEL 26-14-02-01-02, LP 1338218: R & R LT BULK SMOKE DETECTOR.  OPS CHECK OK MM 26-14-51.  DMI 141651 IS CLOSED.

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