You have an avionics overheat situation while on the ground. What should you do if the cooldown requires extensive time?

In the scenario of an avionics overheat situation while on the ground, the most appropriate action is to turn off the Inertial Reference Units (IRUs) to prevent further battery drain. IRUs consume significant power, and if the system is overheating, keeping them on can exacerbate the problem. By turning them off, you can help conserve battery life and allow other critical systems that may be necessary for managing the overheat situation to continue functioning or remain powered longer.

Turning off the IRUs also permits the avionics systems to cool down, potentially alleviating the overheat condition more effectively. The focus here is on maintaining system integrity and ensuring that no additional strain is placed on the aircraft's power management systems, which could lead to further complications. In this context, conserving as much power as possible is a prudent decision while addressing the overheating issue.