Which of the following describes a hung start?

A hung start is characterized by a situation in which the engine fails to reach the required RPM for normal operation, resulting in a start failure. During this condition, the engine’s temperature, specifically the Interstage Turbine Temperature (ITT), does not increase; it typically remains stable or may even drop. This lack of increase in ITT indicates that combustion is not occurring as expected within the engine, which is diagnostic of a hung start condition.

In contrast, other outcomes such as delayed starts or conditions with fluctuations in power are indicative of different scenarios, such as a slow or unsuccessful ignition process or reaching a normal start phase, where the engine is operational but experiencing instability. Understanding the specific characteristics of a hung start aids in appropriate troubleshooting and corrective measures during aircraft engine operations.