Raytheon Beech King Air 90, Raleigh, N.C., April 27, 2006–The pilot of King Air N90CH reported a fire in the cockpit and diverted to Raleigh. The NTSB is looking into the incident and has requested that the windshield heating unit be sent for examination. There was no substantial damage to the airplane, which is registered to Chartco of Salisbury, N.C.