# SDR UPS01435591

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2001
- Submitted: April 18, 2001
- Operation: Air carrier
- Aircraft: N674UP
- Make and model: Boeing 747123F
- Aircraft serial: 20100
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Condition: Inoperative
- Location: Nr 4 Engine
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS01435591

## Discrepancy

NR 4 FIRE LOOP INOP.      REPLACED NR 4 ENG LOWER FWD SENSING ELEMENT AND OPS CHECK NORMAL PER M M 26-11-02 THIS CLEARS M212481

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.