How is the Cessna 172 oil system designed?

The oil system of the Cessna 172 is designed as a wet sump system. In a wet sump system, oil is stored in the engine's crankcase and is circulated through the engine via an oil pump. This design is beneficial because it simplifies the oil supply system and reduces weight, as there is no need for an external oil tank.

In the Cessna 172, the oil is drawn from the sump when the engine is running, lubricating the various components of the engine, and then it returns back to the sump after circulating through the engine. This system maintains proper oil levels and temperatures during operation, which is crucial for engine performance and longevity.

Other types of oil systems, like dry sump systems, involve a separate oil tank and a complex system of hoses, which can add weight and complexity to the aircraft. The closed and open system classifications are not applicable in this context, as they refer to different aspects of oil containment and circulation but do not accurately describe the Cessna 172’s oil system. Thus, the choice of a wet sump system aligns with the operational needs and design of the aircraft’s engine.