Incident Overview
A commuter flight was taxiing to the gate when the pilot observed a fire warning light for the No 2 engine. The fire bottle was discharged, and the fire was extinguished. An examination revealed that a fuel line, part number 3103385-1, had broken and started the fire.
Examination Findings
The fuel line exhibited tool marks. A laboratory examination determined that the line had failed due to fatigue, and the fatigue had originated in the area of the tool marks. The tool marks suggested that a crescent wrench or similar tool had been used to bend the line in order to align it with the attach fitting.
Company Response
The company was advised of the findings. A company directive was issued to discontinue the practice of bending fuel lines with tools.