# SDR UIEA2026011200009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2026
- Submitted: January 14, 2026
- Operation: Air carrier
- Aircraft: [N419MC](https://openairdocs.org/aircraft/N419MC), registered now
- Make and model: Boeing 747-48EF
- Registry model: [Boeing 747-48EF](https://openairdocs.org/model/boeing-747-48ef) (OpenAirDocs)
- Aircraft serial: 28367
- Aircraft time: 119,995 hours, 20,741 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Wire
- Condition: Shorted
- Location: Fire Detector
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: E, F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026011200009

## Discrepancy

NUMBER 4 ENGINE FIRE INDICATION ON ENG SHUTDOWN.  PERFORMED ENG FIRE ON GROUND QRH.DISCHARGED BTH FIRE BOTTLES PER QRH INDICATION EXTINGUISHED AFTER SECOND BOTTLE.  C/W FIM 26-11 TASK 808, NO FIRE CONDITION, FOUND T5683 LP A SHORT TO GROUND AND LOOP B BROKEN WIRE. IAW SWPM 20-31-11/20-63-13,  REPLACED W5316-002-16R, IAW AMM 26-11-02, REPLACED T5683 ASSY & ENG FIRE OVHT DET SYS TEST NORMAL. IAW AMM 26-21-03,  REPLACED RT BOTH FIRE EXTINGUISHER BOTTLES & TEST NORMAL. IAW AMM 71-00-00, PERFORMED NR 4 ENG IDLE RUN AND CHKD NORMAL. REF IPC 26-21-03-01 ITEM 55 & IPC 26-11-02-02A, ITEM 100.

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