Which description correctly identifies a dry sump lubrication system?

Which description correctly identifies a dry sump lubrication system?

• A. Stores oil in a reservoir outside the engine using a scavenge pump and external tubing.
• B. Stores oil in a reservoir inside the engine.
• C. Has no scavenge pump.
• D. Stores oil in the wing fuel tank.

Answer: (A)

In a dry sump lubrication system, oil is stored in a reservoir outside the engine and circulated by external pumps. A pressure pump delivers oil from that external tank to the engine, while scavenger pumps remove used oil from the crankcase and return it to the external reservoir through external tubing. This setup keeps most of the oil volume away from the moving engine parts, increasing oil capacity and preventing oil starvation during high-G or inverted flight. The description that fits is the one that specifies oil is stored in a reservoir outside the engine and uses a scavenge pump with external tubing. Storing oil inside the engine describes a wet sump, which has a smaller onboard oil capacity and is more susceptible to starvation in aggressive maneuvers. The absence of a scavenge pump or storing oil in a wing fuel tank would not align with how a dry sump system functions.

In a dry sump lubrication system, oil is stored in a reservoir outside the engine and circulated by external pumps. A pressure pump delivers oil from that external tank to the engine, while scavenger pumps remove used oil from the crankcase and return it to the external reservoir through external tubing. This setup keeps most of the oil volume away from the moving engine parts, increasing oil capacity and preventing oil starvation during high-G or inverted flight.

The description that fits is the one that specifies oil is stored in a reservoir outside the engine and uses a scavenge pump with external tubing. Storing oil inside the engine describes a wet sump, which has a smaller onboard oil capacity and is more susceptible to starvation in aggressive maneuvers. The absence of a scavenge pump or storing oil in a wing fuel tank would not align with how a dry sump system functions.