What is the maximum transient ITT limit during operation?

The maximum transient ITT (Interstage Turbine Temperature) limit during operation is 870ºC for a duration of 20 seconds. This limit is critical because it allows for temporary excursions above normal operating temperatures, which can occur in various situations such as during takeoff or when experiencing sudden increases in power demands.

While the engine can tolerate these transient temperatures for a limited time without causing damage, exceeding this duration or temperature could lead to serious engine degradation. The transient ITT limit is carefully defined to ensure that pilots and maintenance crews can maximize engine efficiency while still protecting the integrity of the engine components.

Understanding this limit is crucial for safe flight operations, particularly for those who operate under Part 135 regulations, where adherence to manufacturer's specifications and limitations is mandatory for compliance and safety.