How does the Refuel/Defuel system work?

How does the Refuel/Defuel system work?

• A. It is basically a manifold with a single point ground or in-flight input and an outlet in each internal and external fuel tanks.
• B. It uses separate hoses for each tank.
• C. It uses a single fixed fuel line to the engine.
• D. It only operates on the ground with power off.

Answer: (A)

The system is built around a single fueling manifold that serves as the gateway for all refueling and defueling operations. One input point, which can be connected to ground support equipment or an in-flight refueling source, feeds fuel into this common manifold. From there, outlets lead to each internal fuel tank and to external tanks as needed. Valves control which tanks receive fuel or are drained, allowing fuel to be added to or removed from any tank through the same centralized path. This arrangement simplifies plumbing, enables rapid distribution and balance among tanks, and supports both ground and in-flight operations with a single point of connection. The other concepts don’t fit because they imply separate hoses for each tank, a direct engine fuel path as the primary line, or operation limitations to ground power-off scenarios, none of which accurately describe how a unified refuel/defuel manifold handles all tanks from a single input.

The system is built around a single fueling manifold that serves as the gateway for all refueling and defueling operations. One input point, which can be connected to ground support equipment or an in-flight refueling source, feeds fuel into this common manifold. From there, outlets lead to each internal fuel tank and to external tanks as needed. Valves control which tanks receive fuel or are drained, allowing fuel to be added to or removed from any tank through the same centralized path. This arrangement simplifies plumbing, enables rapid distribution and balance among tanks, and supports both ground and in-flight operations with a single point of connection.

The other concepts don’t fit because they imply separate hoses for each tank, a direct engine fuel path as the primary line, or operation limitations to ground power-off scenarios, none of which accurately describe how a unified refuel/defuel manifold handles all tanks from a single input.