The C-5A propulsion system installation is described and discussed. Induction system, exhaust system, and thrust reverser configurations define the general nacelle concepts. Installation features of the various subsystems, including the air bleed, engine starting, and fire protection systems are discussed. Installation requirements which are influenced by the high bypass ratio, short duct, turbofan engine configuration are noted and discussed. Where significant, comparison is made with requirements for an assumed long duct configuration. Special emphasis is placed on cooling and venting. Accessibility and maintenance features are also highlighted in the discussions.