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GEAR VALVES FOUR-CHANNEL SERVOACTUATORS MAIN LANDING GEAR BRAKE/ANTISKID VALVES RUDDER/SPEEDBRAKE POWER DRIVE POSITIONING MECHANISM E ACTUATOR (PITCH) UPPER ARM POSITIONING UNIT MECHANISM ROTARY ACTUATOR ACCESS DOORS UPPER MAIN HONEYCOMB PANEL FORWARD LOWER COVER EQUIPMENT BAY FRAMES Figure 4-11.— Orbiter passive thermal control unit Shuttle space suit Fuel cell power plant Solid Rocket Boosters on the food trays. Meal preparation for the first manned lunar landing, a Space Shuttle.