# SDR UIEA2026062800550

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2026
- Submitted: June 29, 2026
- Operation: Air carrier
- Aircraft: [N404KZ](https://openairdocs.org/aircraft/N404KZ), registered now
- Make and model: Boeing 747481F
- Aircraft serial: 34283
- Aircraft time: 71,505 hours, 13,224 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Wire
- Condition: Damaged
- Location: Fire Detector
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: F, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026062800550

## Discrepancy

FIRE APU WARNING MSG. DISCHARGED BOTTLE.  REF WDM 26-15-11-1 INSPECTED AND FOUND W720-452-18R AND W720-451-18R SHORTED TO EACH OTHER UNDER CLAMP. REPAIRED WIRES PER SWPM 20-30-12. FIRE SYSTEM TEST PASSED FOR APU LOOPS A ND B PER AMM 26-15-00-735-009. </P>)

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