Aircraft Accident Investigation Report

33 The ignition harness was damaged by impact and by fire; there was no further examination of this component. The starter was securely attached at the mounting with impact damage to the bottom of the housing; there was no further examination of this component. The rear-mounted vacuum pump was secure at the mounting pad but had sustained fire damage. Identification such as part number and serial number could not be obtained due to destroyed data tag. The oil filter was not present with the engine at the time of examination. The oil suction filter screen was removed from the sump and found to be in a clean condition with a ridge of solder along one edge of the screen. The oil hoses and lines were in place but largely fire damaged. A borescope inspection of the cylinders was conducted; there was light rust inside the cylinder wall of the No. 2 cylinder, the cylinder borescope did not reveal any other findings. The No. 3 cylinder rocker arm cover was damaged; this was consistent with impact damage. The No. 2 cylinder intake rocker arm did not have any shims under the rocker arm as seen in Figure 34. Figure 34 No. 2 Engine Cylinder