What happened
During the initial climb phase following takeoff, the aircraft experienced an uncontained failure of the right engine, which led to a loss of power. Due to the loss of performance, the aircraft was unable to maintain its climb, necessitating an emergency descent. To avoid obstacles including automobiles and street light poles, the pilot executed a forced landing on a street.
Upon touchdown, the aircraft performed a gear-up landing. During the landing sequence, the plane slid into a block wall. A fire broke out following the impact, triggered by a fuel leak originating from the left wing. There were 0 fatalities and 0 injuries reported in the immediate aftermath of the crash.
Findings
Investigations into the engines conducted at the manufacturer's facilities identified the source of the failure. The right engine showed evidence of an uncontained separation of the second stage turbine rotor disk. Analysis of the fragments from the disk indicated that the failure occurred via a low cycle fatigue fracture mode.
This fatigue process began at several points located at and near the inside diameter bore surface on the aft side of the disk. The engine manufacturer determined that these multiple initiation points were linked to porosity and primary carbides within the cast material that were too small to be detected during standard inspections. No other material or casting defects were found in the fractures throughout the wheel.