Incident Overview
During the landing roll, a fire ignited in the right engine. The source of the fire was located near the point where the fuel supply line connects to the engine-driven fuel pump. The aircraft had just completed its first revenue flight following a replacement of the right engine. At the time of the engine change, the flexible fuel and oil hoses were not replaced.
Investigation Findings
Examination of the fuel system revealed that part of the fuel hose had become hardened, and two cracks were found in the rubber liner. When the boost pump was activated, fuel streamed from the line. It was determined that the 'B' nut at the fuel pump may not have been securely tightened during the installation of the replaced engine. This potential lack of secure tightening could have contributed to the fuel leak, leading to the fire.
Fuel System Condition
The fuel hose showed signs of degradation consistent with age or hardening, and the presence of cracks in the liner allowed fuel to escape under pump pressure. The decision not to replace the flexible hoses during the engine change left older components in service, which may have increased the risk of failure.