How long is the cool down period after starter attempts 3 to 5?

The correct answer indicates that the cool down period after starter attempts 3 to 5 is 5 minutes. This cool down period is crucial because it allows the starter motor to cool down and prevents overheating, which could lead to damage to the starter system or the engine.

Proper management of starter attempts is essential for safe engine start procedures. The guidelines for cool down periods are established to ensure that all components function within their operational limits and minimize the risk of component failure. In the case of the CRJ 900, following this 5-minute cool down period between consecutive starter cycles helps maintain the integrity and reliability of the engine starting system.

Understanding these limitations is vital for flight safety and effectiveness in operational scenarios, as they reflect industry best practices for maintaining aircraft systems.