Incident Overview
A Stinson floatplane experienced a structural failure shortly after takeoff from rough water. The pilot reported a loud pop in the right front area of the aircraft during climb, followed by severe vibration. This prompted a decision to perform a precautionary landing.
Sequence of Events
The aircraft had climbed to approximately 200 feet above the river when the loud pop was heard. The pilot, not realizing that the floats had separated from the airplane, attempted a normal water landing. Upon touchdown, the fuselage impacted the water directly, and the aircraft ultimately sank.
Investigation
The investigation focused on the separation of the floats from the airframe. No probable cause was determined from the available information.