THE PILOT'S IMPROPER IN-FLIGHT DECISION, HIS FAILURE TO FOLLOW PROPER IFR PROCEDURES, AND AN IMPROPERLY PLANNED APPROACH, WHICH RESULTED IN AN INFLIGHT COLLISION WITH RISING TERRAIN DURING THE EXECUTION OF THE MISSED APPROACH PROCEDURE. FACTORS RELATED TO THE ACCIDENT WERE: THE PILOT'S IMPROPER PREFLIGHT PLANNING AND PREPARATION.