What is the typical rate of increase for ITT that indicates a hot start?

The typical rate of increase for Interstage Turbine Temperature (ITT) that indicates a hot start is recognized as being more than 1000 °C. A hot start generally refers to a condition when the engine experiences excessive temperatures during the start sequence, potentially leading to engine damage or operational failures. When ITT rises above this threshold, it signifies significant heat accumulation that can compromise the integrity of the engine components.

Recognizing a hot start is crucial for maintaining safety and engine performance, which is why understanding the specific temperature indicators is important for operators. In the context of engine operations, adherence to these temperature limits helps prevent adverse effects, such as thermal distress or component failure. Thus, the identification of an ITT exceeding 1000 °C serves as a vital warning sign during the engine start process.