Which component of the ignition system is checked during powerplant inspections?

The component of the ignition system that is checked during powerplant inspections is the spark plugs and associated wiring. Spark plugs play a critical role in the combustion process within the engine by igniting the air-fuel mixture. During inspections, it is essential to examine the condition of the spark plugs to ensure they are functioning properly. This includes checking for wear, carbon deposits, and ensuring there are no signs of damage that could lead to misfiring or inefficient combustion.

The associated wiring is equally important, as it connects the ignition system components and carries the necessary electrical current to the spark plugs. Any issues with the wiring, such as insulation failure or corrosion, can result in poor ignition performance, which would adversely affect engine performance.

Other components listed, like battery terminals, generator coils, and starter motors, play vital roles in the overall operation of the aircraft but do not pertain directly to the ignition system. Battery terminals are essential for providing electrical power, generator coils are involved in charging the system, and starter motors facilitate the initial engine start. However, they do not directly impact the ignition system's effectiveness in igniting the fuel-air mixture within the cylinders.