How long can the maximum transient ITT of 870ºC be maintained?

• A. 5 seconds
• B. 20 seconds
• C. 60 seconds
• D. 5 minutes

Answer: (B)

The maximum transient ITT (Interstage Turbine Temperature) of 870ºC can be maintained for a duration of 20 seconds. This limit is established to protect the engine from overheating and potential damage. During transient conditions, such as during takeoff or climb, engines are sometimes subjected to higher temperature thresholds to optimize performance. The 20-second limit allows pilots to manage engine performance effectively without risking damage, while also ensuring safety protocols are adhered to.

Maintaining the transient ITT beyond this specified time could lead to serious engine complications. Thus, understanding these limitations is critical for pilots, especially in Part 135 operations, where adherence to operational standards and safety measures is paramount. It highlights the importance of monitoring engine parameters during critical phases of flight to ensure aircraft integrity and compliance with regulatory requirements.