Incident Overview
A pilot was informed of icing conditions before entering clouds. Despite the aircraft's prohibition from flight into known icing conditions, the pilot chose to continue and land at the planned destination. Upon entering the clouds, the aircraft immediately began accumulating ice, which prevented it from achieving a significant climb rate and required a nearly full-power approach at an airspeed 30 to 40 knots faster than the normal flaps-up landing speed.
Approach and Landing
The pilot executed an instrument landing system (ILS) approach to an airport 5 miles from the destination. After breaking out below the clouds, the pilot canceled IFR and continued under VFR to the destination airport, whose runway is approximately 3,100 feet shorter than the runway used for the ILS approach. On final approach, about 30-50 feet above ground level, the pilot reduced power and extended flaps from 10 degrees to 20 degrees. The aircraft's speed immediately dropped, and the left wing descended. The aircraft descended and landed hard, bouncing once before settling on the runway.
Post-Landing Inspection
After taxiing to the ramp, the pilot inspected the airplane and noted about 1/2 inch of ice on all flight surfaces.
Emergency Procedure Note
The pilot's operating handbook specifies that in an 'Inadvertent Icing Encounter,' wing flaps should remain retracted. The pilot extended flaps from 10 to 20 degrees during the approach.