# SDR IPXA2023082152186

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 2023
- Submitted: August 21, 2023
- Operation: Air carrier
- Aircraft: [N609UP](https://openairdocs.org/aircraft/N609UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 64254
- Aircraft time: 21,832 hours, 3,231 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Part number: 474660
- Part serial: AEP1080
- Condition: Warning Message
- Location: Unknown
- Stage of operation: CR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2023082152186

## Discrepancy

BOTH FIRE LOOP A AND B  STATUS MESSAGES PRESENT AFTER DET FIRE/ OUT 1 EICAS MESSAGE. THIS RESULTED IN AND AIR TURN BACK. C/W FIM 26-11-00-810-818 AND AMM 26-11-00-730-801, FOUND FIRE DETECTOR LOOP A AND LOOP B HAVE HIGH RESISTANCE.  REMOVED AND REPLACED FIRE DETECTOR TS883 PER AMM 26-11-02/401. RESISTANCE CAME BACK INTO RANGE.   OPERATIONS CHECK GOOD.

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