What happened
Prior to departure, the pilot conducted a weather briefing using the company's digital system and reviewed the data with the chief pilot. While the pilot was aware of the general forecast, the briefing failed to include critical in-flight weather advisories, specifically the AIRMET Zulu regarding moderate icing.
During the initial climb to 12,000 ft msl, the aircraft type encountered light rime ice, which was managed using the onboard de-icing equipment. Seeking smoother conditions, the pilot requested a descent to an altitude between 5,000 and 6,000 ft msl. As the aircraft descended, it entered light to moderate icing conditions. Although the pilot considered diverting to an alternative airport, clearance was not obtained until the flight was nearing its destination.
Shortly after, the aircraft entered severe icing conditions. In an effort to preserve altitude, the pilot applied maximum engine power. The aircraft eventually emerged from the cloud layer approximately 500 ft above the ground. Due to the inability to maintain altitude, the pilot performed an off-airport emergency landing. During the impact, the landing gear separated from the airframe, and the aircraft sustained significant damage to the fuselage and wings. The aircraft remained upright following the event.
Findings
Post-accident inspection revealed structural icing on the airframe. The aircraft was operating within its maximum gross weight, and no mechanical failures were reported prior to the encounter. The investigation determined that the severe icing conditions involving supercooled large droplets exceeded the performance capabilities of the aircraft to maintain flight altitude.