Hot section inspections for modern turbine engines are required based on what criteria?

Hot section inspections for modern turbine engines are primarily mandated based on a time or cycle basis. This practice is critical as the hot section of the engine, which includes components like the combustion chamber, turbine blades, and nozzle, experiences extreme temperatures and stresses during operation. Over time and through repeated usage cycles, these components can undergo wear, thermal fatigue, or degradation, which can lead to potential failures if not addressed.

By implementing a time or cycle-based inspection schedule, operators can proactively identify and address any issues before they result in engine malfunctions. This approach also aligns with the manufacturer's recommendations and regulatory requirements, ensuring the safety and reliability of the engine over its operational lifespan. Thus, adhering to these inspection criteria keeps both the aircraft and passengers safe while maintaining optimal engine performance.