# SDR SB06087

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 2, 2006
- Submitted: September 5, 2006
- Operation: Air carrier
- Aircraft: N435US
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24557
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Part number: 6131508551
- Condition: Faulty
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SB06087

## Discrepancy

CLT - FLIGHT DEPARTED DCA, EN ROUTE TO FLL, WITH THE NR 1 ENGINE A-LOOP FIRE DETECTION ON MEL 26-2A.  DURING CRUISE, THE NR 1 ENGINE B-LOOP FAULT LIGHT ILLUMINATED.  CREW PERFORMED FIRE TEST AND HANDLE WOULD NOT TEST IN B-LOOP.  WITH NO FIRE PROTECTION ON THE NR 1 ENGINE, FLIGHT DIVERTED TO CLT AND LANDED WITHOUT FURTHER INCIDENT.  NO EMERGENCY WAS DECLARED.  MAINTENANCE TROUBLESHOT NR 1 ENGINE -A- AND -B- LOOPS IN ASSOCIATION WITH MM 26-11-00-1, FIGURE 101.  ALSO CHECKED EACH INDIVIDUAL LOOP.  ALL CHECK GOOD.  REMOVED AND REPLACED NR 1 ENGINE CORE HARNESS PER MOC REQUEST.  OPERATIONAL CHECK OF FIRE WARNING OK.  ACCOMPLISHED ENGINE TEST FOR HARNESS CHANGE PER MM 71-00-00.  CLEARED MEL 26-2A FOR NR 1 ENGINE -A-

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