The engine has an independent _________ _____________ lubrication system installed on each engine.

• A. Wet sump
• B. Dry sump
• C. Splash lubrication
• D. Boundary lubrication

Answer: (B)

Understanding oiling systems helps explain why one engine would have its own dry-sump setup. In a dry-sump lubrication system, oil is stored in an external reservoir rather than in the engine’s crankcase. The system uses a pressure pump to deliver oil to bearings, and scavenger pumps to pull used oil out of the crankcase and return it to the external tank. This arrangement allows each engine to have an independent oil supply and pump system, so oil pressure and volume stay reliable even during high-speed maneuvers or unusual attitudes. It also lets the oil tank be larger and not limited by the crankcase volume.

That independence and the external reservoir are the main reasons this option fits the statement. Wet-sump systems keep oil in the crankcase, which can lead to oil starvation in demanding flight conditions. Splash lubrication relies on splash from moving parts rather than a full-flow system, and boundary lubrication is a specific contact condition, not a complete engine oiling architecture.