# SDR ASAA2021071935440

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2021
- Submitted: July 23, 2021
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 27,305 hours, 8,810 cycles
- System (JASC): [2697 · Fire Protection System Wiring](https://openairdocs.org/jasc/2697)
- Part: Wire Harness
- Part number: CA24402
- Condition: Faulted
- Location: Nr 2 Fire Loop
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021071935440

## Discrepancy

#2 ENGINE FIRE DETECTION LOOP B HAS A FAULT LOOP A DOES NOT SHOW A FAULT. GROUNDED - YES.  REMOVED AND REPLACED NR 2 ENGINE MW0326 CORE FIRE DETECTOR HARNESS REF B737-900 AMM 26-11-02. ACCOMPLISHED ENGINE FIRE DETECTION OPS CHECK REF AMM 26-11-00-710-801 ALL TEST PASS. GROUND VERIFICATION TEST SUCCESSFUL.

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