The intent of this guide is to define the scope and narrow the field of study as far as possible to the aeronautical knowledge required for qualifying for the private or commercial pilot (glider) certificate. Briefly summarized are type of test items used, hints for taking the test, and certificate requirements. The study outline is the basic framework of aeronautical knowledge that the prospective commercial pilot should know and be able to apply to pertinent situations. Topics of the study outline are: Federal aviation requirements, National Transportation Safety Board, safety investigation regulations, flight information publications and aeronautical charts, principles of flight, weather, navigation, sailplane operation and performance, sailplane structure and maintenance, flight instruments, towing, equipment, thermal soaring, ridge soaring, wave soaring, strange field landings, instrument flight, and airport traffic procedures. The two appendixes consist of recommended and optional study materials and sample test items with answers and explanations. (BP)