Manual 5, Aviation Fuel Quality Control Procedures: 5th Edition is an educational publication for entry-level fuel handling personnel. Fuelhandling jobs are not considered skilled labor, require no college, and there are no educational programs available. Some seminars address aspects of aviation fuel handling, but it is not a true “trade.” The book is also meant to educate more advanced readers, who are, for example, skilled laboratory workers, but who have no knowledge of aviation fuel handling. Section A is dedicated to field tests and field sampling techniques. Section B addresses the determination of solid particulate contamination. Section C is dedicated to water detection in fuel. Section D covers aviation fuel filtration, including the correct choice of filters, and the use, inspection, and maintenance of vessels and controls. Section E is dedicated to the problem of microbes that grow in fuel systems, which feed on fuel or one another.