# SDR NWAA094286743

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2009
- Submitted: December 16, 2009
- Operation: Air carrier
- Aircraft: N643NW
- Make and model: Boeing 747249F
- Aircraft serial: 22245
- Aircraft time: 97,254 hours, 22,152 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Warning
- Condition: False Activation
- Stage of operation: TO
- How discovered: O
- Nature of condition: N
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NWAA094286743

## Discrepancy

ON TAKEOFF, FIRE WARNING AND CHIME OCCURRED.  TAKEOFF ABORTED, RETURNED TO GATE.  MAINTENANCE TESTED ALL FIRE WARNING SYSTEMS, ALL NORMAL.  DUE TO HISTORY OF THE 1A MAIN DECK SMOKE DETECTOR, IT WAS PLACED ON MEL.  MAINTENANCE REPLACED THE SMOKE DETECTOR AT THE NEXT STATION.  OPERATION TEST WAS GOOD.  MEL WAS REMOVED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.