What is the required cooling time after the third start sequence?

The required cooling time after the third start sequence is 30 minutes OFF. This cooling period is essential to prevent overheating and to allow the engine components to return to a safe operating temperature before initiating another start sequence. Each start sequence significantly increases the temperature and stress on the engine, and following the manufacturer's guidance ensures that the engine remains in optimal condition and reduces the risk of damage or failure. Adhering to this cooling time is critical in Part 135 operations, where safety and reliability are paramount.