Operations, but countdown clock holds will increase the 4.

DRAINAGE HOLOING POND WATER TANK ORAINAGE HOLDING POND PAD TERMINAL CONNECTION ROOM (PTCR) LIQUID HYDROGEN FACILITY DRAINAGE HOLOING POND WATER TANK ORAINAGE HOLDING POND PAD TERMINAL CONNECTION ROOM (PTCR) LIQUID HYDROGEN TANK LIQUID OXYGEN VENT VALVE AND FAIRING А INTERTANK LIQUID OXYGEN INTERTANK TANK UMBILICAL PLATE Figure 2-17.—Space Shuttle Extemal Tank. HYDROGEN TANK PRELAUNCH COOLANT LOOP UMBILICAL SERVICE PANEL (DISCONNECTED — AT T — 10 min Range.