THREE GROUPS OF SUBJECTS WERE TRAINED TO PRIVATE PILOT PROFICIENCY, USING A GROUND PILOT TRAINER, TO FIND HOW MANY HOURS OF GROUND TRAINING CAN BE SUBSTITUTED FOR AIRCRAFT DUAL INSTRUCTION. TRAINING TIME REQUIRED WAS COMPARED BETWEEN GROUPS AND WITH THAT OF A CONTROL GROUP NOT USING A TRAINER. THE GROUP THAT USED THE TRAINER MOST NEEDED SIGNIFICANTLY LESS TIME FOR PRIVATE PILOT CERTIFICATION AND SOLO. HOWEVER, SUCCESS WAS ATTRIBUTED PRIMARILY TO THE INSTRUCTOR'S INFLUENCE. WHEN GROUPS WERE COMPARED BY TOTAL FLIGHT TIME PLUS GROUND PILOT TRAINER TIME (OR OBSERVER), THE CONTROL GROUP HAD THE LEAST TOTAL TIME IN TRAINING. RESULTS WERE CONSIDERED INCONCLUSIVE. TEN PILOTS WERE ALSO TRAINED IN INSTRUMENT PILOT PROFICIENCY USING A GROUND TRAINER TO FIND THE SHORTEST TIME REQUIRED TO MEET CERTIFICATION STANDARDS. AVERAGE TIMES WERE NEAR THE MINIMUMS CURRENTLY REQUIRED. PILOTS WITH LESS THAN TOTAL FLYING EXPERIENCE REQUIREMENTS WERE AS SUCCESSFUL AS THOSE WITH HIGH EXPERIENCE LEVELS. FURTHER STUDY IS NECESSARY TO DETERMINE IF TOTAL EXPERIENCE REQUIREMENTS CAN BE LOWERED. (THE DOCUMENT INCLUDES TABLES, CHARTS, FIVE PHOTOS, AND APPENDIXES.) THIS DOCUMENT, AD-653-736, IS AVAILABLE FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VA. 22151. MICROFICHE $0.65, HARDCOPY $3.00. (AUTHOR/LY)