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Almost never. Jet engines on aircraft are usually overhauled rather than being replaced. Each model of engine has specific requirements to be inspected at regular hour intervals. Also, usually at some limit of hours of operation, they must be rebuilt. Some engines can extend the hours to overhaul if the inspections show the engine wear is low enough. A typical interval for overhaul might be 4000 hours, but each model is different. These engines can cost millions of dollars. It is very cost effective to overhaul rather than replace.

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