FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

Practice this question and more.

Which of the following is likely to reduce the lifespan of a spark plug?

Regular maintenance
Using appropriate fuel type
Excessive heat buildup
Proper installation

The correct answer is: Excessive heat buildup

Excessive heat buildup is a significant factor that can reduce the lifespan of a spark plug. When a spark plug operates at higher than designed temperatures, it can lead to several detrimental effects. This elevated temperature can cause the electrodes to wear down more quickly, leading to a shorter operational lifespan. Additionally, excessive heat can result in pre-ignition or detonation within the engine, which can further erode the plug and impair engine performance. In contrast, regular maintenance helps ensure the engine runs efficiently, using the appropriate fuel type can prevent issues related to combustion, and proper installation ensures that the spark plug functions as intended, all contributing to the longevity and performance of the spark plug. Excessive heat, however, directly impacts the composition and durability of the materials used in the spark plug, making it a primary concern for lifespan reduction.