What happened
On 10 June 2008, a Cessna U206A seaplamne, registration SE-IIX, was performing a landing on the eastern part of Lake Norasjön in Örebro county. The pilot, returning from a flight to Kilafors, had previously checked weather reports indicating strong winds across Sweden. Upon approaching the landing site, the pilot observed breaking waves on the water surface.
After touching down on the open water, the pilot reduced engine power to idle with the intention of drifting backward to a nearby inlet. During this period, the aircraft was struck by a powerful gust or a whirlwind from the left. This force lifted the left wing significantly, causing the right float to submerge and the right wingtip to strike the water. The aircraft subsequently turned to the right, further increasing the lift on the left wing and causing the plane to pitch forward. The propeller struck the water, stalling the engine, and the aircraft quickly capsized onto its back. The occupants managed to exit the cabin before it became submerged, and were rescued by local emergency services via boat.
The investigation
The Swedish Accident Investigation Authority (SHK) examined the weather conditions, the flight sequence, and the aircraft's stability. Investigators compared wind measurements from nearby stations, noting that wind speeds on the open lake were likely higher than those recorded at the local airport or rescue station due to the influence of terrain and the presence of gusts. The investigation also reviewed the pilot's adherence to safety regulations, noting that the pilot was not wearing a life vest or shoulder straps at the time of the accident.
Findings
- The landing was conducted in wind conditions that exceeded safe operational limits for seaplane flight.
- The aircraft was likely struck by a strong gust or a localized whirlwind, which initiated the sequence of the wing submerging and the subsequent capsize.
- According to established seaplane handbooks, the wind conditions present were categorized as either requiring emergency-only flight or being impossible for seaplanes.
- While the pilot was not wearing a life vest or shoulder straps, these factors did not directly impact the survival of the occupants in this specific instance.