FAA Ground School Practice Test

What is one purpose of the dual ignition system on an aircraft engine?

1. To increase fuel efficiency

2. To improve engine performance

3. To reduce weight

4. To simplify maintenance

The correct answer is: To improve engine performance

One of the primary purposes of a dual ignition system on an aircraft engine is to improve engine performance. This system includes two separate ignition sources that each fire at the same time, providing redundancy and enhancing reliability. If one spark plug or ignition system fails, the other can continue to operate, ensuring that the engine does not quit mid-flight. The dual ignition setup also contributes to more complete combustion of the fuel-air mixture, which can lead to smoother operation and increased power output. By having two sets of spark plugs for each cylinder, it helps to ensure a more consistent and effective ignition, which is particularly important in aviation where engine reliability and performance directly impact safety. Although the other choices touch upon various factors that might influence an aircraft's operation, they do not specifically relate to the critical role that dual ignition plays in enhancing engine performance and reliability. For example, while fuel efficiency might be a secondary benefit, it is not the main purpose of employing a dual ignition system. Similarly, simplifying maintenance or reducing weight are not primary objectives of this design, which is primarily focused on performance enhancement and safety assurance.