What is a key activity during a visual inspection of an engine?

During a visual inspection of an engine, looking for leaks or loose parts is a critical activity. This process involves examining various components and systems for signs of fluid leaks, which can indicate underlying issues such as seals or gaskets that need repair. Additionally, identifying any loose parts is essential, as they can lead to mechanical failures or unsafe operating conditions if not addressed.

A visual inspection aims to catch potential problems early before they develop into more significant and costly repairs. Checking fuel levels, while important, is a different task and typically a part of routine maintenance rather than a focal point of a visual inspection. Changing the oil and replacing spark plugs are specific maintenance tasks that require additional steps and tools, whereas a visual inspection is often a quick first assessment to maintain engine health and safety.