FAA Powerplant Written Practice Test

In reference to a shower of sparks ignition system, which statement is true?

1. Only the retard breaker points are unnecessary

2. Both breaker points are essential during starting

3. Only the timed opening of the retard breaker points is designed to prevent engine "kickback"

4. Both breaker points malfunction under high load

The correct answer is: Only the timed opening of the retard breaker points is designed to prevent engine "kickback"

The statement about the timed opening of the retard breaker points being designed to prevent engine "kickback" is accurate. In a shower of sparks ignition system, the timing of the retard breaker points is crucial during the starting process. The retard breaker points operate to delay the ignition spark until after the engine has completed its compression stroke, which reduces the likelihood of the engine "kicking back" against the starter. This kickback can damage the starter or injure personnel, making the timing of the spark crucial for safe operation. The retard breaker points enhance the overall reliability of the ignition system by ensuring that ignition occurs at the optimal moment in relation to the engine cycle. By delaying ignition until the appropriate moment, it ensures smoother engine starts and helps to mitigate the effects of excessive pressure within the combustion chamber at startup. This understanding is key when working with avionics and powerplant systems to ensure safe and effective engine operation.