What should be done if the main engine turbine rotors cannot rotate within 5 minutes?

If the main engine turbine rotors cannot rotate within 5 minutes, securing the main engine is the most appropriate action. This is crucial because a failure to rotate indicates a significant issue, such as a potential mechanical failure, gear binding, or a critical lack of lubrication, which could lead to severe damage if not addressed immediately. By securing the main engine, you prevent further damage to the turbine and associated components, ensuring safety and limiting potential hazards.

In a situation where the turbine rotors are stuck, simply increasing the turbine speed could exacerbate the problem, leading to more significant mechanical failures or a catastrophic event. Checking the fuel supply might be necessary in other contexts, but it is not a direct solution to a situation involving mechanical stasis. Notifying the engineering officer is an important step for communication and management, but it should come after taking immediate action to secure the engine to ensure safety first.