What is the limitation imposed on engine operations at lower temperatures?

The correct answer indicates that engine oil must exceed 40°C prior to full power operation. This limitation is critical for ensuring the proper functioning and longevity of the engine. At lower temperatures, engine oil tends to be more viscous and does not flow as freely, which can lead to inadequate lubrication of engine components. When the oil temperature is below the specified limit, the engine might not only produce more wear and tear due to insufficient lubrication but also risk overheating or damage, which could compromise performance and safety.

Adhering to this temperature requirement allows for optimal oil viscosity, ensuring that the oil adequately coats the engine's moving parts, thus preventing mechanical failures and ensuring efficient engine operation. This operational limit is established based on the engine design and the characteristics of the oil used, ensuring that pilots maintain a safe margin during engine operations.