When the SPR valve is moved to DRAIN, to which tank does the manifold drain fuel go?

• A. No.1 Main Fuel Tank
• B. No.2 Main Fuel Tank
• C. No.3 Main Fuel Tank
• D. No.4 Main Fuel Tank

Answer: (C)

When the SPR valve is moved to DRAIN, the drain line is connected to a dedicated tank path so that any fuel in the manifold is directed into a specific drain tank. In this system, that drain goes to the third main fuel tank. This arrangement helps ensure drainage is captured in a single location for proper handling, while keeping the other tanks and normal fuel feed paths unaffected. The other tanks aren’t targets for drainage in this position because they are tied to the normal fuel feed and transfer routes, not the drain path.