Cosmos Phase II Ultralight Rolls on Side After Landing at Prineville Airport

A Cosmos Phase II weight-shift-control ultralight, registration N145W, sustained substantial damage during a landing at Prineville Airport (PRZ) in Prineville, Oregon, on May 2, 2026. The aircraft experienced a "duckwalk" — a side-to-side oscillation — during its rollout, according to federal incident data.

The oscillation caused the right tire to blow, sending the aircraft rolling onto its side. No fatalities or injuries were reported. Authorities have not publicly identified the pilot or owner, and no operator information has been released in federal incident summaries.

The Cosmos Phase II is a recreational trike featuring a hang-glider-style wing and weight-shift controls. Depending on configuration, such aircraft may operate under FAA Part 103 regulations, which do not require a pilot certificate or medical for single-seat ultralights. Previous incidents involving the Cosmos Phase II model have included low-altitude power line strikes and engine failure due to fuel exhaustion.