THE PILOT'S VFR FLIGHT INTO INSTRUMENT METEOROLOGICAL CONDITIONS (IMC), FAILURE TO MAINTAIN CONTROL OF THE AIRCRAFT AFTER BECOMING SPATIALLY DISORIENTED, AND INADVERTENTLY EXCEEDING THE DESIGN STRESS LIMITS OF THE AIRCRAFT. FACTORS RELATED TO THE ACCIDENT WERE: THE ADVERSE WEATHER CONDITIONS, FAILURE OF THE PILOT TO OBTAIN A PREFLIGHT WEATHER BRIEFING, AND THE PILOT'S LACK OF INSTRUMENT EXPERIENCE.