# SDR UIEA2015071300342

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2015
- Submitted: July 13, 2015
- Operation: Air carrier
- Aircraft: [N473MC](https://openairdocs.org/aircraft/N473MC), registered now
- Make and model: Boeing 747-45E
- Registry model: [Boeing 747-45E](https://openairdocs.org/model/boeing-747-45e) (OpenAirDocs)
- Aircraft serial: 27174
- Aircraft time: 91,717 hours, 16,167 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Warning
- Condition: False Activation
- Location: Cockpit
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2015071300342

## Discrepancy

AFTER B/O FIRE, MAIN DECK AFT EICAS MSG CONFIRMED.  NO FIRE RETURNED TO BLOCKS.  PERFORMED CMC FIRE WARNING TEST, SYS CHECKED NORMAL IAW AMM 26-14-00-735-067.  NO OTHER MSG NOTED.  NOTICED HIGH HUMIDITY, FOG, ON AFT MAIN DECK CAUSING THE AFT FIRE DETECTORS TO ACTIVATE.  ACFT OK FOR SERVICE.

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