The lifespan of an aircraft engine varies significantly depending on its type. Some engines necessitate major overhauls after only a few thousand flight hours. However, engines found on passenger aircraft are capable of operating for tens of thousands of hours. The exact limits are determined by rigorous inspection schedules and maintenance protocols. These protocols are essential for ensuring flight safety and preventing mechanical failures. Engine manufacturers and airlines closely monitor engine performance to determine when maintenance is required. Ultimately, the permissible lifespan balances operational efficiency with the critical need for safety in aviation operations within Indonesia.