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8-15 APPROACH AND LANDING GEAR BODY FLAP ROTARY ACTUATORS HYDRAULIC MOTOR-DRIVEN ELEVON FOUR-CHANNEL SERVOACTUATORS Power Generation ..................... 4-9 Environmental Control and Life Support System s. Last eres 4-17 Thermal Protection .................... 4-25 Purge, Vent, and Drain System .......... 4-33 AVIONICS .............................. 4-37 5 ORBITER CREW ACCOMMODATIONS AND EQUIPMENT 19 — TOW-WAY TO VEHICLE ASSEMBLY BUILDING The Vehicle Assembly Building in the.