Which parameter indicates the remaining life of an engine component before replacement or overhaul?

The correct answer is the LLP expiry date. LLP stands for Life Limited Parts, which are components that have a specific operational lifespan determined by the manufacturer. These parts must undergo replacement or overhaul after reaching their pre-defined limits to ensure safety and reliability. The LLP expiry date is crucial because it provides a clear indicator of how much operational life remains on a given engine component before it must be taken out of service.

This parameter is particularly important in aviation maintenance practices, as it helps maintenance personnel to schedule maintenance activities, ensure compliance with regulations, and maintain the safety of operations. Monitoring the LLP expiry date allows for proactive maintenance actions rather than reactive ones, which can prevent potential failures and expensive repairs.

In contrast, the last inspection date might indicate when a component was last checked for safety and performance, but it does not directly provide information about how much life remains before the component should be replaced or overhauled. Power setting pertains to the operating conditions under which an engine runs, which does not reflect the component’s remaining life in service. Aircraft age could suggest the overall wear and tear on the aircraft but does not specifically indicate the condition of individual engine components and their need for replacement based on life limits.