What is the maximum transient ITT allowed for a brief period?

The maximum transient ITT (Interstage Turbine Temperature) allowed for a brief period is 870 degrees Celsius. This limit is established to ensure engine safety and prevent damage due to overheating. Transient conditions are typically short-duration operations that can occur during specific phases of flight, such as takeoff or during an emergency, allowing for temporary excursions above normal operating limits.

Exceeding this temperature can lead to thermal stress and potential engine damage, which is why this specific threshold is crucial for maintaining engine integrity while still providing flexibility during critical maneuvers. The established limit reflects a balance between operational necessity and ensuring the longevity and reliability of the engine. Understanding these limits is essential for pilots in managing engine parameters effectively during flight.