Which entity sets mandatory replacement times for critical components of turbine engines?

The correct answer is the engine manufacturer because they are responsible for the design and construction of the turbine engine and its components. The engine manufacturer conducts extensive testing and analysis to determine the operational limits and expected lifespan of critical components. Based on this data, they establish mandatory replacement times to ensure safe operation and reliability of the engine throughout its service life. These guidelines help to mitigate risks associated with component failure and ensure that maintenance practices are in line with safety regulations and standards in the aviation industry.

The other entities mentioned have different roles; for instance, the aircraft maintenance manual provides detailed instructions for maintaining the aircraft and its systems but does not set mandatory replacement times for engine components. The pilot in command is responsible for the operation of the aircraft but does not dictate maintenance schedules or replacement times for parts. The aviation safety board focuses on investigation and regulation enforcement rather than establishing specific maintenance requirements for engine components.