How many times can the engine operate ON continuously before requiring longer OFF durations?

The correct answer is based on the operational limitations of the engines in the King Air 350, particularly concerning the cooling periods between operations. In the case of continuous operations, engines can run for a specified number of cycles before they require longer cooling off periods. For the King Air 350, the engines are designed to operate continuously for three cycles before they necessitate a more extended downtime to allow for proper cooling and to maintain engine health. This is a critical consideration in flight operations, as pushing the engines beyond their intended operational limits without adequate cooling can lead to overheating, increased wear, or potential engine failure.

Understanding this limitation is essential for maintaining the operational integrity of the aircraft and ensuring safety during flight operations.