VFR FLIGHT INTO INSTRUMENT METEOROLOGICAL CONDITIONS (IMC) BY THE PILOT, AND HIS FAILURE TO MAINTAIN SUFFICIENT ALTITUDE AND CLEARANCE FROM MOUNTAINOUS TERRAIN. FACTORS RELATED TO THE ACCIDENT WERE: THE TERRAIN AND WEATHER CONDITIONS, THE PILOT'S OVERCONFIDENCE IN HIS PERSONAL ABILITY, HIS PERCEIVED PRESSURE TO COMPLETE THE FLIGHT, AND HIS LACK OF INSTRUMENT EXPERIENCE.