Incident Overview
A pilot reported an incident involving ice accumulation and a stall during an ILS approach. According to the pilot's account, after descending to a lower altitude, the airframe began picking up moderate to severe mixed ice. The pilot cycled the de-icing boots and turned on the windshield heat, then climbed back to a higher altitude, which cleared most of the ice.
Approach and Landing
The pilot was cleared for the ILS approach. The aircraft broke out of the clouds at about 400 feet and 1/4 mile from the runway. When the aircraft was over the runway numbers and approximately ten feet above the runway surface, the aircraft unexpectedly stalled. The pilot added full power, but the right main landing gear touched down hard, and the right wing tip contacted the runway surface.
Post-Landing Findings
The landing was completed, and the pilot taxied the airplane to the hangar. After exiting the aircraft, the pilot noted that most of the airframe was moderately to severely covered with ice, including the leading edges of the vertical and horizontal stabilizers and the propeller spinner.