Which area in an aircraft has a built-in fire suppression system?

The area in an aircraft that is equipped with a built-in fire suppression system is the lavatory waste bin. This system is crucial because the waste bins can pose a fire hazard due to the presence of flammable materials, such as paper and other waste items. The suppression system typically uses a fire-extinguishing agent that is automatically activated if a fire is detected, helping to prevent the spread of fire within the cabin.

In contrast, although other areas like the cockpit have fire detection and suppression measures, they are primarily focused on equipment and systems rather than specific waste areas. The cargo hold also has fire suppression systems but is not as directly related to waste and flammable materials as the lavatory bins. Overhead bins do not have built-in fire suppression features, and their main function is to store passenger items. Understanding these distinctions emphasizes the lavatory waste bin's specialized fire prevention role in maintaining overall aircraft safety.