What method is used to cool the flight deck avionics?

The method used to cool the flight deck avionics is through avionics exhaust fans. These fans are specifically designed to remove heat generated by the avionics systems during operation. The avionics in the flight deck often produce significant amounts of heat, which, if not properly managed, could lead to equipment failure or degradation of performance. The exhaust fans ensure that this heat is vented efficiently, maintaining optimal operating temperatures and contributing to the overall reliability and longevity of the avionics systems.

The other options, while they might have roles in the broader context of aircraft cooling, do not specifically target the heat produced by flight deck avionics in the way that avionics exhaust fans do. Aviation fans and external fans may not provide the focused cooling needed directly for avionics, and thermal blankets are used for insulation rather than active cooling, making them unsuitable for the specific cooling needs of avionics components.