THREE PRECEDING REPORTS PRESENTED THE EFFECTS OF SHORTENING TRAINING TIME IN AVIONICS FUNDAMENTALS AND AVIATION ELECTRONICS TECHNICIAN (RADAR) TRAINING UPON THE FINAL COMPREHENSIVE EXAMINATION IN THESE COURSES AND UPON PERFORMANCE IN A SUBSEQUENT EQUIPMENT COURSE. THIS REPORT COMPARES THE ON THE JOB PERFORMANCE OF GRADUATES FROM FOUR GROUPS MATCHED ON THE BASIS OF GRADES MADE IN A SHORT COURSE TAKEN PRIOR TO TRAINING IN AVIATION ELECTRONICS. EACH GROUP RECEIVED DIFFERENT LENGTHS OF TRAINING. IN GENERAL, FLEET PERFORMANCE WAS AFFECTED BY THE LENGTH OF TRAINING--THE LONGER THE TRAINING, THE BETTER THE PERFORMANCE. SHORTENING THE FUNDAMENTAL ELECTRONICS COURSE APPEARED TO AFFECT ON THE JOB PERFORMANCE MORE THAN SHORTENING THE EQUIPMENT COURSE. HOWEVER, THE FUNDAMENTALS COURSE WAS FIVE WEEKS SHORTER WHILE THE EQUIPMENT COURSE WAS THREE WEEKS SHORTER. WHILE THE GROUPS DIFFERED ON THE FINAL EXAMINATION ACCORDING TO THE LENGTH OF THE COURSE, THE DIFFERENCE IN SCORES WAS UNDEFINED IN TERMS OF ON THE JOB PERFORMANCE. THIS DOCUMENT, AD-661-858, IS AVAILABLE FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VA. 22151. MICROFICHE $0.65. HARDCOPY $3.00. 27 PAGES. (AJ)