# SDR P5CA0701532

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 2007
- Submitted: September 18, 2007
- Operation: Air carrier
- Aircraft: [N452PA](https://openairdocs.org/aircraft/N452PA), registered now
- Make and model: Boeing 747-46NF
- Registry model: [Boeing 747-46NF](https://openairdocs.org/model/boeing-747-46nf) (OpenAirDocs)
- Aircraft serial: 30810
- Aircraft time: 28,797 hours, 4,910 cycles
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Circuit Card
- Part number: 285T0035202
- Part serial: D5229
- Condition: Malfunctioned
- Location: Power Supply
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA0701532

## Discrepancy

MASTER WARNING AND FIRE BELL CONTINUOUSLY DISPLAYED ACTIVATED WITH NO ASSOCIATED EICAS OR STATUS MESSAGES.  RESEATED MAWEA CARDS AND SYSTEM BITE TESTED OK PER AMM 31-51-00-715-014 AS PRECAUTIONARY REPLACE MAWEA PWR SUPPLY CARDS PER MM 31-51-01 AND C/W MM 31-52-00; OPS SYSTEM FUNCTION TESTED NO FAULTS NOTED. SYSTEM RETURN TO SVC.

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