What is the purpose of an engine run-up?

The purpose of an engine run-up is to evaluate engine performance before flight. This procedure typically occurs before takeoff and involves running the engine at various power settings, allowing the technician or pilot to observe its behavior under load. During the run-up, essential factors such as engine RPM, magneto examination, and vibration levels can be monitored to ensure everything operates within safe parameters. This process helps in identifying any possible issues that could affect performance or safety during the flight, allowing for any necessary adjustments or repairs to be made before departure.

While preparing the engine for maintenance, checking fuel quality, and adjusting engine parameters for efficiency are important aspects of aviation maintenance and operations, they do not specifically encapsulate the primary function of an engine run-up. The run-up's main focus is directly related to assessing engine performance capabilities and reliability just prior to flight.