Incident Overview
During the landing flare, the aircraft suffered a loss of power. The pilot attempted to mitigate the touchdown by pulling the collective control from an altitude of approximately 30 feet above ground level. Despite this action, the landing was hard.
Engine Examination
A post-accident examination of the engine was conducted. The inspection identified a failure of the #1 turbine disc. Laboratory analysis of the disc determined that the failure resulted from overheating and fatigue.
Fuel Control Quadrant Inspection
An airworthiness directive (AD) was in effect that aimed to prevent after fires resulting from incomplete fuel cut-off during engine shutdown. The AD specified adjusting the fuel control quadrant to read minus 2 degrees when the throttle lever is against the minimum stop. Investigation into the accident aircraft revealed that the fuel control quadrant indicated 0 degrees with the throttle lever against the minimum stop, indicating non-compliance with the AD.