Which of the following indicates no start?

The choice indicating no start is characterized by the absence of an ITT (Interstage Turbine Temperature) indication. In engine start procedures, ITT is a crucial parameter that reflects the temperature of the exhaust gases entering the turbine. If there is no ITT indication, it signifies that the engine did not ignite, meaning the start sequence has failed. This absence suggests that regardless of other parameters, the engine has not successfully initiated combustion.

The other options present different scenarios that do not definitively indicate a no start condition. For example, a slow rising ITT may show that the engine is attempting to start but not performing optimally, while a loss of power or airspeed could indicate engine performance issues post-start. Similarly, a rapid decay of N1 could imply engine malfunction or shutdown after the start has occurred, rather than signaling a failure to start in the first place. Thus, the absence of an ITT indication is a clear and direct sign of a no start situation.