Accident Overview
A seaplane conducting a local test flight following an electric equipment post-maintenance check crashed shortly after liftoff. During the initial climb, the aircraft encountered difficulties gaining altitude, stalled, and crashed in flames in an open field. The aircraft was destroyed in the accident.
Occupant Injuries
Both pilots were killed, while three other occupants sustained serious injuries. The exact number of occupants on board was not specified.
Probable Cause
According to official findings, the probable cause of the accident was inadequate preflight preparation by the crew, who failed to obtain and maintain flying speed during takeoff. Investigators determined that the aircraft stalled due to an excessive accumulation of ice on the airframe. At the time of the accident, approximately 50% of the aircraft's surfaces were covered with frost that had not been removed prior to takeoff.
Flight Purpose
The flight was classified as a local test flight, specifically to check electric equipment after maintenance. The source also notes the flight involved mineral research, though further details are not provided.