What happened
The pilot attempted to initiate a takeoff from a calm section of a reservoir. Despite the selection of a relatively sheltered area, wave heights were estimated to be between four and six feet. During the ground roll, the aircraft struck several waves. The right wingtip dragged in the water, causing the aircraft to nose over. The aircraft came to rest inverted and partially submerged. The pilot managed to pull his son and daughter from the aircraft before he drowned.
The investigation
The investigation focused on the conditions present during the takeoff attempt. The primary factor identified was the interaction between the aircraft and the water surface. The presence of waves, despite the calm appearance of the reservoir section, played a critical role in the loss of control. The dragging of the right wingtip disrupted the stability of the aircraft during the acceleration phase.
Findings
The incident highlights the risks associated with takeoff operations on bodies of water with even moderate wave activity. The pilot's decision to attempt takeoff in conditions with four to six foot waves contributed significantly to the accident. The amphibious aircraft was unable to maintain directional control and stability due to the hydrodynamic forces acting on the wingtip. The pilot survived the initial impact but succumbed to drowning after rescuing his children. 1 fatal, 2 not injured.
Safety message
Pilots operating amphibious aircraft must carefully assess water conditions before attempting takeoff. Even areas that appear calm may have significant wave action that can compromise control during the critical acceleration phase. Adequate clearance from waves is essential to prevent wingtip contact and subsequent loss of control.