NTSB Probable Cause

THE FLIGHTCREW'S DECISION TO CONTINUE AN UNSTABILIZED INSTRUMENT LANDING SYSTEM (ILS) APPROACH THAT LED TO A STALL, MOST LIKELY OF THE HORIZONTAL STABILIZER, AND LOSS OF CONTROL AT LOW ALTITUDE. CONTRIBUTING TO THE ACCIDENT WAS THE AIR TRAFFIC CONTROLLER'S IMPROPER VECTORS THAT POSITIONED THE AIRPLANE INSIDE THE OUTER MARKER WHILE IT WAS STILL WELL ABOVE THE GLIDESLOPE. CONTRIBUTING TO THE STALL AND LOSS OF CONTROL WAS THE ACCUMULATION OF AIRFRAME ICE THAT DEGRADED THE AERODYNAMIC PERFORMANCE OF THE AIRPLANE.