Which statement is true about No.3 Main Fuel Tank?

• A. It receives drain from the manifold drain when SPR valve is in DRAIN
• B. It stores LOX
• C. It houses life rafts
• D. It powers the braking system

Answer: (A)

Fluid routing and valve positions determine where drains go in a propulsion or vehicle fuel system. The No.3 Main Fuel Tank acts as the collection point for manifold drainage when the SPR valve is set to DRAIN. In that position, the drain line is connected toward the tank, so any drain from the manifold is directed into No.3 Main Fuel Tank for collection. This makes sense because LOX is stored in a separate oxidizer system, life rafts are kept in safety or emergency equipment areas, and the braking system is powered by hydraulics or electric systems—not by a fuel tank. So the statement about receiving the manifold drain when the SPR valve is in DRAIN correctly describes how the drainage routing works.