Private Pilot Private Practice Exam

The primary purpose of the dual ignition system in an aircraft engine is to improve engine performance. This system utilizes two separate ignition sources for each engine cylinder, which ensures more reliable engine operation. In the event that one spark plug fails, the other can still ignite the fuel-air mixture, preventing engine failure and allowing for continued operation, which is critical for safety. Additionally, dual ignition can provide more complete combustion of the fuel, leading to smoother operation and reduced risk of engine roughness, which enhances overall performance.

While enhancing fuel efficiency is a possible benefit of improved combustion, it is not the primary purpose of the dual ignition system. Similarly, the system does not specifically aim to reduce engine weight or increase propeller speed; those factors are influenced by other engine design choices and operational parameters.