At about 1235 eastern time, a Gates Learjet 35A was damaged when taxiing after landing at Akron-Canton Regional Airport. The pilot and co-pilot were not injured. The pilot said the taxi from the runway to the ramp was normal. After making a 90-degree turn onto the ramp, the airplane began to slide on top of an ice layer. The brakes were ineffective and the co-pilot shut down the engines. Due to the downward slope of the ramp area and the wind conditions, however, the airplane continued to accelerate and struck a concrete retaining wall. An FAA inspector noted that the ramp area was covered with a 1-inch layer of smooth clear ice. Winds at the time were from 300 degrees at 16 knots, with 27-knot gusts.