# SDR KCSA2017053107

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2017
- Submitted: June 1, 2017
- Operation: Air carrier
- Aircraft: N402KZ
- Make and model: Boeing 747481F
- Aircraft serial: 34017
- Aircraft time: 40,399 hours, 7,792 cycles
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Fire Loop
- Condition: Dirty
- Location: Nr 3 Nacelle
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KCSA2017053107

## Discrepancy

NR 3 ENGINE FIRE LOOP A AND B STATUS MESSAGES. INSPECTED THE ENGINE FIRE LOOPS, FOUND SILVER MIGRATION. CLEANED FIRE LOOP CERAMIC HEADERS IAW CMM 26-10-65. PERFORMED RESISTANCE CHECK, NO DEFECTS NOTED. PERFORMED SYSTEM OPERATIONS CHECK IAW MM 26-11-00. NO DEFECTS NOTED.

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