FAA Powerplant Written Practice Test

What is a consequence of "flash-over" in a distributor?

1. Increased engine power

2. Electrical shorts

3. Conductive carbon trail

4. Loss of ignition

The correct answer is: Conductive carbon trail

The occurrence of "flash-over" in a distributor is particularly relevant to ignition systems as it refers to the phenomenon where a high-voltage spark jumps from one terminal to another instead of traveling through the intended path to the spark plug. This type of failure can create a conductive carbon trail. When a flash-over happens, the high voltage can cause carbon deposits to form in the distributor. These deposits can act as conductive pathways, allowing electricity to travel through unintended routes. This can lead to misfiring or weak sparks, which may severely affect engine performance. As a result, a conductive carbon trail forms from the flash-over, creating a potential for further electrical issues down the line if not properly addressed. Therefore, recognizing the consequence of flash-over and its ability to create these conductive paths is crucial for diagnosing and maintaining ignition systems effectively.