Reliability characteristics of the TCE1-FRG, TCE1 Mod 3, and CE1 Mod 3 catapults were determined and are presented as a function of both test program length and mission size. Dolly and cable operations had to be separated from the aircraft operations in order to more accurately determine catapult performance. Expressions are developed which permit the prediction of catapult reliability for any mix ratio of aircraft, cable, and dolly launchings. Valid ...