# SDR P5CA2021100300374

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 2021
- Submitted: October 6, 2021
- Operation: Air carrier
- Aircraft: [N454PA](https://openairdocs.org/aircraft/N454PA), registered now
- Make and model: Boeing 747-46NF
- Registry model: [Boeing 747-46NF](https://openairdocs.org/model/boeing-747-46nf) (OpenAirDocs)
- Aircraft serial: 30812
- Aircraft time: 13,707 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Module
- Part number: 285U0084215
- Part serial: D02636
- Condition: Faulted
- Location: Fire Warning
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2021100300374

## Discrepancy

INTERMITTENT FIRE BELL/MASTER WARNING IN CLIMB, CRUISE AND DESCENT, NO OTHER INDICATIONS.  REMOVED AND REPLACED MAWEA MASTER MODULE A, AND MASTER MODULE B, OPS CHECK GOOD IAW AMM 31-51-00.

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