What should thrust be kept below for credit towards the cooldown period?

Keeping thrust below 80% N2 is necessary to ensure that the aircraft maintains operational integrity and does not exceed the limitations set forth for safe cooldown periods. This threshold is crucial for both engine health and the overall safety of the flight operation. When thrust is maintained under this level, it allows for a sufficient cooldown time that prevents potential overheating or undue stress on engine components. Adhering to this guideline supports compliance with operational procedures designed for the longevity and reliability of the engine, thus promoting the safety and efficiency of flight operations.