EXPERIMENTAL FLIGHT TRAINING WAS CONDUCTED IN CONJUNCTION WITH A COMMERCIAL MODEL GROUND TRAINER TO DETERMINE ITS EFFECTIVENESS IN CONTRIBUTING TO THE PROFICIENCY LEVEL USUALLY OBTAINED BY STUDENTS UNDERGOING A RIGIDLY CONTROLLED FLIGHT SYLLABUS WITHOUT USE OF SYNTHETIC TRAINING DEVICES. DIFFERENTIAL LEVELS OF TRAINING WITH THE GROUND TRAINERS WERE PRESCRIBED FOR THREE EXPERIMENTAL GROUPS OF STUDENTS. ALL STUDENTS IN THE EXPERIMENTAL GROUPS WERE PERMITTED TO ACCELERATE THEIR INDIVIDUAL TRAINING WITH RESPECT TO THEIR DEMONSTRATED PROFICIENCY. RESULTS INDICATE THAT NO APPRECIABLE REDUCTION IN TOTAL AIRCRAFT TRAINING TIME WAS EVIDENT, PARTICULARLY IN VIEW OF THE ADDITIONAL HOURS OF TRAINING IN THE GROUND TRAINER. HOWEVER, AIRCRAFT TIME WAS REDUCED FROM 50 HOURS TO 43 HOURS BUT AT THE COST OF GROUND TRAINER TIME. A SECOND PHASE OF THE EXPERIMENTAL PROGRAM INVOLVING USE OF THE TRAINER WAS THE INSTRUMENT TRAINING FOR A CONTROL GROUP HAVING PRIVATE PILOT QUALIFICATIONS. PHYSICAL FEATURES AND EQUIPMENT OF THE TRAINER WERE ALSO EVALUATED, AND COMMENTS ARE INCLUDED IN THE DISCUSSION. THIS DOCUMENT, AD-653-729, IS AVAILABLE FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VA. 22151. MICROFICHE $0.65, HARDCOPY $3.00. (AUTHOR/LY)