No ITT increase after 25 Seconds indicates which condition?

• A. Normal Start
• B. Hung Start
• C. Aborted Start
• D. Hot Start

Answer: (C)

During an engine start, ignition should cause the inter-turbine temperature (ITT) to rise as fuel begins burning and the engine starts to spool. If there is no ITT increase after about 25 seconds, ignition did not occur. This means the start sequence has failed to ignite, so you abort the start to prevent fuel from accumulating and potential damage. You would then follow the aborted-start procedures and prepare for a restart or other actions.

Normal starts show a normal ITT rise as ignition occurs and the engine accelerates toward idle. A hung start involves ITT rising but the engine not accelerating (N2 may not spool up). A hot start features ITT rising to an abnormally high value during ignition.None of those indicate a complete lack of ignition within the time window like an aborted start.