Dry-sump lubrication systems have which feature?

• A. Oil is contained in a separate tank and circulated through the engine by pumps; usually includes an air cooler
• B. Oil is stored in the engine crankcase only
• C. Oil is not circulated
• D. Oil has no cooling

Answer: (A)

Dry-sump lubrication stores oil in a separate reservoir and uses pumps to move it through the engine. Oil is pumped from this external tank to lubricate the engine, while scavenger pumps pull oil back to the tank, keeping the crankcase relatively oil-free. This arrangement typically includes an air cooler or external oil cooler to dissipate heat, which helps maintain oil temperature during operation. The separation of oil from the crankcase avoids oil starvation during high-G maneuvers and increases oil capacity and system reliability. Other setups store oil in the crankcase and circulate it there, or omit circulation and cooling, which are not characteristics of a dry-sump system.