In smoke mode, what happens to the radar fan regarding the ECS draw Thru?

In smoke mode, the radar fan is secured to prevent any potential interference with the aircraft's systems and to mitigate fire risks. This is crucial because when smoke is detected, the priority shifts to ensuring the safety of the aircraft's environment by minimizing airflow that could spread contaminants. Securing the radar fan aligns with protocols intended to maintain safety in situations where smoke is detected, making it a critical part of the emergency response procedure.

The other choices do not accurately reflect the protocol in smoke mode. Continuous operation of the radar fan would risk circulating smoke and could be hazardous. Allowing the fan to remain unchecked wouldn't provide the necessary control needed in an emergency. Lastly, monitoring the fan remotely does not address the immediate concerns of safety and contamination during smoke conditions. Therefore, securing the radar fan is the appropriate action in this scenario.