What condition must be met before performing full power operations in colder temperatures?

Before performing full power operations in colder temperatures, it is essential that the oil temperature exceeds 40°C. This requirement is critical because proper oil temperature ensures that the oil can effectively lubricate and protect the engine components. In colder conditions, engine oil may be more viscous, and operating at a lower temperature could result in inadequate lubrication, which increases wear and can lead to engine failure.

Exceeding 40°C helps to ensure that the oil viscosity is within an optimal range, allowing for improved flow and engine performance. While other options focus on different conditions, they do not specifically address the critical aspect of oil temperature in relation to ensuring safe and effective full power operations in colder environments.