ORBITER SUB-SYSTEMS THERMAL PROTECTION SYSTEM GUIDANCE NAVIGAT/ON, AND CONTROL HYDRAULIC · AUXLIARY POWER UNIT · LANDING SYSTEM CREW CABIN ELECTRICAL POWER ORBITAL MANUEVERING SYSTEM REACTION CONTROL SYSTEM COMMUNICATIONS ENVIRONMENTAL CONTROL AND LIFE SUPPORT PAYLOAD DEPLOYMENT AND RETRIEVAL STRUCTURESORBITER SUB-SYSTEMS • THERMAL PROTECTION SYSTEM • GUIDANCE, NAVIGATION, AND CONTROL • HYDRAULIC • AUXILIARY POWER UNIT • LANDING SYSTEM • CREW CABIN • E L E C T RIC A L P O W E R • ORBITAL MANUEVERING SYSTEM • REACTION CONTROL SYSTEM • COMMUNICATIONS • ENVIRONMENTAL CONTROL AND LIFE SUPPORT • PAYLOAD DEPLOYMENT AND RETRIEVAL • STRUCTURES 11