Which of the following is NOT considered a fire zone in powerplant fire detection?

In the context of fire detection systems in powerplants, a fire zone is typically defined as any area where flammable materials are present, and where the potential for a fire to originate is significant. This includes areas with high heat, fuel, or any other fire-related hazards.

The passenger cabin, while it may have some potential fire risks due to equipment and materials found inside, is generally not classified as a technical fire zone compared to areas where fire detection systems are specifically designed to monitor for ignition sources and contain fire risks more directly related to engine operations or fuel handling.

The engine power section, APU compartments, and compressor and accessory sections are all critical parts of an aircraft's engine where the combination of fuel, air, and high temperatures can lead to fires, necessitating dedicated fire detection systems. These zones are monitored closely for safety, emphasizing the operational importance of having fire detection capabilities there. A distinction is made that the passenger cabin does not demand the same level of specialized fire detection as the engine-related areas. Therefore, it is recognized that the passenger cabin is not considered one of the primary fire zones in the context of fire detection in powerplants.