What type of lubrication system is installed on each engine?

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

Answer: (A)

Dry sump lubrication is used because it keeps oil in a separate external reservoir rather than in the engine itself, with pumps to feed the engine and scavenger pumps to return oil to the tank. This setup provides a reliable and constant oil supply and pressure even during extreme flight attitudes or maneuvers, and it allows the engine to be mounted where space is limited without needing a large crankcase oil cavity. Wet sump would store oil in the crankcase and is more prone to starvation in high-G or inverted flight, splash lubrication relies on splash from moving parts and may not maintain sufficient film at high speeds, and boundary lubrication describes a thin film at surfaces rather than a complete, active system. So the installation described uses a dry sump.