Which device is responsible for cooling the PFD?

The PFD (Primary Flight Display) fan is responsible for cooling the PFD. This fan helps to dissipate heat generated by the electronic components within the display, ensuring that the PFD operates efficiently and maintains optimal performance. Overheating can lead to malfunctions or reduced lifespan of electronic components, which is why cooling is critical. The fan typically activates automatically when the display reaches a certain temperature threshold.

The other options do not pertain directly to cooling functions. The PFD backup is a secondary system that provides flight information if the primary display fails, the PFD controller manages inputs to the display but does not cool it, and the PFD booster is not a recognized term related to the cooling or operation of the display.