What is the purpose of injecting extinguishing agent into the AMAD bay?

Injecting an extinguishing agent into the AMAD (AUXiliary Maintenance Air-Duct) bay serves a crucial role in fire safety during aircraft operations. The AMAD bay can be susceptible to fires due to the presence of fuel and other flammable materials associated with aircraft systems. By introducing the extinguishing agent, the primary goal is to suppress any potential fire that may occur in this area. This action is vital not only to protect the aircraft structure and components but also to ensure the safety of personnel working around the aircraft.

Cooling down the structure of the aircraft does not directly address the immediate fire threat; it's an indirect consequence of extinguishing a fire if one exists. Preparing for engine maintenance is not relevant to the immediate purpose of injecting an extinguishing agent, as this action is focused on fire response rather than maintenance tasks. Checking for leaks also does not align with the function of the extinguishing agent, which is specifically aimed at fire suppression rather than inspecting structural integrity or fluid containment. Thus, the focus on extinguishing fires makes the second option the purpose of injecting extinguishing agent into the AMAD bay.