# SDR NWAA094376743

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 17, 2009
- Submitted: December 18, 2009
- Operation: Air carrier
- Aircraft: N643NW
- Make and model: Boeing 747249F
- Aircraft serial: 22245
- Aircraft time: 97,299 hours, 22,159 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Ground Wire
- Condition: Loose
- Location: Smoke Detector
- Stage of operation: CL
- 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/NWAA094376743

## Discrepancy

DURING CLIMB, CAPT'S MASTER WARNING LIGHT ILLUMINATED INTERMITTENTLY WITH NO BELL.  MAINTENANCE FOUND A LOOSE GROUND WIRE AT MAIN DECK SMOKE DETECTOR 1A.  PROBLEM WAS DUPLICATED BY MOVING WIRE.  GROUND WIRE WAS TIGHTENED.  ALL SMOKE DETECTORS TESTED GOOD.

---
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.