Commercial Pilot License (CPL) Practice Exam 2025 - Free Commercial Pilot License Practice Questions and Study Guide

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What is preignition in an aircraft engine?

Ignition of fuel/air mixture at the normal time

Ignition of fuel/air mixture caused by a hot spot

Preignition in an aircraft engine refers to the premature ignition of the fuel/air mixture in the combustion chamber, which occurs before the intended spark plug firing. This can happen due to a "hot spot" - an area within the combustion chamber that becomes excessively hot and ignites the mixture before the spark plug ignites it at the appropriate time. This uncontrolled ignition can lead to increased cylinder pressure and engine knocking, which can cause damage to engine components if not addressed.

Understanding preignition is critical for pilots, as it can impact engine performance and safety. It’s essential to maintain engine temperatures within normal ranges and ensure that the engine components are functioning correctly to prevent the formation of these hot spots that lead to preignition.

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Combustion occurring only in optimal temperature ranges

Delayed ignition leading to engine roughness

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