What happened
The pilot initiated the first attempt to take off from the water but aborted the maneuver due to the presence of boats and water skiers in the area. After clearing the immediate traffic, the pilot back-taxied the aircraft and prepared for a second takeoff attempt on rough water conditions. The aircraft became airborne approximately in the middle of the lake during this second attempt.
Shortly after becoming airborne, the aircraft stopped climbing as the pilot began to raise the flaps. In response to the lack of climb performance, the pilot pulled back on the second notch of flap extension and initiated a shallow turn. Subsequently, the aircraft mushed, collided with trees, and crashed.
The investigation
The investigation focused on the sequence of events during the takeoff phase. Key findings included the decision to abort the initial takeoff due to water traffic, the execution of a second takeoff on rough water, and the pilot's actions regarding flap retraction immediately after becoming airborne. The aircraft's failure to climb and subsequent loss of control were directly linked to the flap configuration changes made by the pilot.
Findings
The primary factors contributing to the accident included the rough water conditions which affected the initial takeoff performance, the pilot's decision to abort the first takeoff, and the critical error in managing flap settings during the second attempt. The abrupt retraction of flaps while at a low airspeed and altitude likely resulted in a stall or mushing condition, leading to the collision with trees.
Safety message
Pilots operating seaplanes must carefully consider water conditions and traffic when planning takeoffs. Abrupt changes in flap configuration during the initial climb phase can lead to a loss of lift and control. It is essential to maintain adequate airspeed and follow proper procedures for flap retraction to ensure a safe climb gradient.