# SDR UIEA2013071600367

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2013
- Submitted: July 16, 2013
- Operation: Air carrier
- Aircraft: [N498MC](https://openairdocs.org/aircraft/N498MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29259
- Aircraft time: 60,512 hours, 9,057 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Wire
- Condition: Chafed
- Location: Apu Fire Loop
- Stage of operation: CR
- 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/UIEA2013071600367

## Discrepancy

APU FIRE WARNING IN FLIGHT.  REPLACED AFLOTS CARD, FIRE LOOP A, FIRE LOOP B, R8052 RELAY, R 7782 RELAY, MEGGED WIRING FROM D63P AND D67P TO DW3206E AND DW3205E, THEN REPLACED WIRING FROM BOTH FIRE LOOPS TO THE APU FIREWALL AFTER FINDING CHAFED WIRES UNDER THE CLAMPS.

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