Final answer:
When shutting down a piston-powered turbocharged engine, it is important to follow specific precautions to prevent damage. These include idling the engine before shutdown and avoiding immediate shut-off after high-speed or heavy-load operation.
Step-by-step explanation:
When shutting down a piston-powered turbocharged engine, there are several precautions that should be taken to ensure its proper functioning and minimize any potential damage. Firstly, it is crucial to allow the engine to idle for a few minutes before shutting it down. This allows the turbocharger to cool down gradually, preventing damage to the bearings and other components. Additionally, it is important to avoid immediate shut-off after high-speed or heavy-load operation, as this can cause heat build-up and potential damage to the engine.