# SDR IPXA2025012463945

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2025
- Submitted: January 27, 2025
- Operation: Air carrier
- Aircraft: [N608UP](https://openairdocs.org/aircraft/N608UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 64255
- Aircraft time: 27,822 hours, 4,088 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Warning Horn
- Condition: False Activation
- Location: Apu Fire
- Stage of operation: NR
- 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/IPXA2025012463945

## Discrepancy

UPON CREW PERFORMING FIRE TEST FOR PRE-DEPARTURE CHECK, APU FIRE WARNING HORN CIRCUIT BREAKER POP OUT. FIRE WAS SHOWING PASS. ALL COCKPIT AURAL WARNING AND INDICATION NORMAL DURING TEST. IAW GMM 03.05.01.03 DEFERRED FAULTS-ADDITIONAL ACTION WDM 49-61-21-1 CB C1144 @ P6 PANEL PULL COLLAR BREAKER AND PLACARD INSTALLED.

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