When turbine engine turbine blades are removed for inspection, how must they be reinstalled?

The correct approach when reinstalling turbine engine blades after inspection is to place them back in the same slot from which they were removed. This practice is critical because each blade is often individually balanced and matched to its specific position in the engine. The aerodynamic characteristics and stress distribution in the blades are finely tuned to work optimally in their designated locations.

When turbine blades are manufactured, they undergo precise machining and treatment processes that account for variations in material properties and design. Installing a blade in a different slot could lead to imbalances, increased vibrations, and uneven wear, which could adversely affect the engine's performance and longevity.

This method ensures consistency in the engine's operational parameters, maintaining safety and efficiency. The other choices suggest practices that do not adhere to these standard procedures and could compromise engine reliability and performance.