What are the indications of a hung start?

A hung start is characterized by a slow increase in ITT (Interstage Turbine Temperature) during the starting sequence, coupled with lower than expected N1 (the first engine speed) and Np (propeller speed) readings compared to normal start parameters. This situation indicates that the engine has not reached the required conditions to continue the start process effectively, primarily due to a lack of sufficient airflow or fuel flow, which causes the temperature to rise slowly instead of ramping up quickly to normal operational levels.

The other choices present scenarios that do not align with the characteristics of a hung start. For instance, high ITT along with high N1 and high torque would suggest a normal start or potential over-temperature conditions. The absence of ITT and Np indications does not typically occur during a hung start and would indicate a more severe malfunction or a completely failed start. Similarly, the rapid decrease in ITT while achieving a higher N1 indicates a different issue, potentially related to engine performance after startup. Thus, the correct identification of a hung start is indicated by the slow rising ITT along with lower N1 and Np values.