<div class="htmlview paragraph">The use of jet pumps in aircraft fuel systems has attracted considerable attention in the past few years. This paper discusses the jet pump development program conducted on the Lear Jet Model 24, 8-passenger executive jet, and the 28-passenger Model 40 jet transport. Also discussed are the results of extensive laboratory testing of jet pumps. The data are presented in a manner that will assist designers of jet pump systems in sizing jet pumps with a minimum of laboratory testing.</div>