What does it mean if an engine part is within "serviceable limits"?

When an engine part is described as being within "serviceable limits," it indicates that the part is still functional and can be used without the need for immediate replacement. This term generally means that the part meets the minimum specifications set by the manufacturer for safe and effective operation.

Being within serviceable limits implies that the component still provides adequate performance and safety based on the defined criteria, such as wear, tolerance, and overall condition. Thus, maintenance personnel can continue to operate the aircraft without concerns about the part's integrity, as it remains compliant with operational standards.

In contrast, other options signify conditions that do not align with the definition of being within serviceable limits, such as needing immediate replacement or being unsuitable for use at all.