When you are working on your airplane's engine or just inspecting it to make sure that it's in good shape after a certain amount of flight hours, it isn't all that easy to look at the entire engine and see what is going on inside. It's not like your car engine that you could take apart and put back together again to look inside and see any problems. For one thing, your car's engine is a lot smaller than airplane's engine, and taking apart your airplane's engine if you don't have to requires a lot of time and a lot of space, especially you generally can't easily take an engine out of your airplane.
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