What happened
During a scheduled post-maintenance test flight, an aircraft experienced a critical engine failure shortly after departing the runway. The flight was being conducted to verify recent mechanical updates, which included the installation of a new carburetor on the right engine.
Following takeoff, the right engine ceased functioning properly. During the subsequent emergency, the propeller on the right engine failed to feather. This configuration led to an aerodynamic stall, causing the aircraft to impact the ground. The accident resulted in three fatalities and left two crew members injured.
Findings
Investigations into the crash identified several critical errors during the emergency phase of flight. While the specific reason for the initial right engine failure remains undetermined, investigators noted that the crew did not adhere to established emergency protocols. Specifically, the crew failed to manage the aircraft's airspeed effectively and did not execute the proper procedures required to handle an engine failure. Additionally, the investigation highlighted that the propeller remained unfeathered and the landing gear was still extended during the sequence of events leading to the stall.