What is the primary action during an electrical fire in flight?

In the event of an electrical fire during flight, the primary action is to take immediate steps to mitigate the fire while ensuring the safety and control of the aircraft. Opening the cabin vents helps to ventilate the area, potentially reducing harmful smoke accumulation and allowing fresh air to enter, which can be crucial for crew and passenger safety. This action provides immediate relief and visibility, making it easier for the pilot to manage the situation.

While activating the fire extinguisher is also a critical step in fighting an electrical fire, it typically comes after ensuring adequate airflow through the cabin. Closing the cabin heat can help minimize further ignition sources, and turning off all avionics may prevent additional electrical loads, but these actions might not be as immediate or effective in addressing smoke and toxic fumes as increasing ventilation. Therefore, opening the cabin vents is recognized as a primary and immediate response to enhance safety during an electrical fire in-flight.