THE PILOT'S FAILURE TO MAINTAIN AIRCRAFT CONTROL AFTER BECOMING SPATIALLY DISORIENTED. FACTORS RELATING TO THE ACCIDENT WERE: THE PILOT'S LACK OF PROFICIENCY (RECENT EXPERIENCE) IN INSTRUMENT FLYING, AND IMPROPER APPROACH CONTROL SERVICE BY VECTORING THE AIRPLANE ONTO THE ILS LOCALIZER COURSE AT AN INADEQUATE DISTANCE FROM THE OUTER MARKER AND AT AN INTERCEPT ANGLE THAT DID NOT ALLOW THE PILOT TO ESTABLISH A STABILIZED APPROACH.