FAA Powerplant Written Practice Test

What unique feature do the royal 447, 503, and 582 engines have?

1. Single ignition per cylinder

2. Breaker-less magneto ignition system

3. Positioned cylinders

4. No coolant system

The correct answer is: Breaker-less magneto ignition system

The royal 447, 503, and 582 engines are known for incorporating a breaker-less magneto ignition system. This feature allows for a more reliable spark and improved engine performance, as it eliminates the need for mechanical points that wear out over time and require periodic adjustments. The breaker-less system provides a consistent and more accurate timing of the spark, enhancing the engine's efficiency and overall reliability. This innovation is particularly valuable in aviation, where engine performance and reliability are critical for safety and operational effectiveness. Additionally, the other options do not accurately describe the unique feature of these engines. For instance, having a single ignition per cylinder is not a standout characteristic of these models, as many engines use multiple ignitions for redundancy. Positioned cylinders and the absence of a coolant system are also common traits in various engine designs, making the breaker-less magneto ignition system a distinctive feature of the royal 447, 503, and 582 engines.