# SDR ASAA12511470

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2012
- Submitted: April 30, 2012
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 22,299 hours, 6,612 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Condition: Malfunctioned
- Location: Nr 2 Nacelle
- 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/ASAA12511470

## Discrepancy

NR 2 ENGINE B SYSTEM, FIRE DETECTION INOPERATIVE.  ACFT GROUNDED. UNABLE TO DUPLICATE. ACCOMPLISHED ENG/APU FIRE DETECT CONTROL MODULE BITE NO FAULTS.  ACCOMPLISHED RESISTANCE CHECK NR 2 ENG FIRE DETECT "B" LOOP IAW AMM TASK 26-11-00-730-801 AND TASK 26-11-01-211-801,  NO DEFECTS.  ENGINE/APU FIRE DETECTION CONTROL MODULE BITE TESTED GOOD.  VERIFIED NR 2 ENG FIRE DETECTION B-LOOP SYS OPS TESTED GOOD ON GROUND.

---
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.