What is required for the drill concerning fires behind the panelling?

The correct approach for addressing fires behind the panelling involves using a crash axe to open the panel. This action is necessary for several reasons. First, it allows flight crew to access the source of the fire and observe its extent, which is vital in assessing the situation accurately. Once the panel is opened, crew members can determine whether the fire is manageable or if further action is necessary, such as evacuation procedures.

Using a crash axe signifies a proactive response to the fire hazard, as opposed to ignoring the fire or simply utilizing water to extinguish it, which may not be safe or effective in this context. Water can potentially exacerbate electrical fires or create additional hazards, and assessing severity is part of the critical decision-making process but does not directly address the immediate need for assessing and containing the fire.

Opening the panel is part of standard emergency procedures and reflects the importance of having the right tools and knowledge when handling potentially dangerous situations on an aircraft.