Which of the following actions should NOT be taken in a fire emergency during a flight?

In a fire emergency during a flight, the decision to evacuate all passengers immediately is not typically advised due to the potential for increasing risk and chaos within the cabin. Evacuating passengers can lead to a number of complications, such as panic, injuries, or even preventable loss of life, especially if the aircraft is still in the air. The flight crew must first assess whether it is safer to manage the situation while remaining airborne or to land and evacuate.

The other actions outlined are standard operating procedures in a fire emergency. Discharging Halon is critical if a fire is detected, as it is effective for extinguishing most onboard fires. Keeping the flight deck door closed helps to prevent smoke or fire from entering and provides the flight crew with the ability to manage the situation effectively without distraction. Disconnecting the EFB from the power source is also prudent to eliminate any risk of electrical ignition from devices during a fire. Each of these actions plays a role in ensuring the safety of both crew and passengers in an emergency scenario, while the immediate evacuation of passengers is a scenario that must be carefully evaluated based on circumstances.