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43 = PAYLOAD BAY DOORS ACTUATION AND LATCHING DEPLOYABLE RADIATORS ACTUATION AND LATCHING DEPLOYABLE RADIATORS ACTUATION AND LATCHING Figure 3-20.— Mechanical subsystems. EXTERNAL SEPARATION FORWARD EXTERNAL TANK UMBILICAL PLATE Figure 2-17.—Space Shuttle Extemal Tank. HYDROGEN TANK LIQUID OXYGEN INTERTANK TANK UMBILICAL PLATE Figure 2-17.—Space Shuttle Extemal Tank. HYDROGEN TANK LIQUID OXYGEN 1.