THE PILOT NOT FOLLOWING WAKE TURBULENCE (VOTEX) AVOIDANCE PROCEDURES, WHICH ARE DETAILED IN FAA PUBLICATIONS, RESULTING IN THE AIRPLANE ENCOUNTERING WAKE TURBULENCE. FACTORS IN THIS ACCIDENT WERE: 1) THE PILOT'S INABILITY TO CONTROL THE AIRPLANE AFTER ENCOUNTERING WAKE TURBULENCE, AND 2) INADEQUATE ALTITUDE TO EFFECT A RECOVERY FROM THE UNCONTROLLED DESCENT.