During turbine engine startup, a hung start is indicated by which condition?

During turbine engine startup, a hung start is indicated by which condition?

• A. Exhaust gas temperature exceeds specified limits
• B. Fails to reach idle RPM
• C. N1 is normal but N2 is low
• D. Engine starts normally and reaches idle

Answer: (B)

A hung start happens when the engine ignites and begins to spool but cannot accelerate to the required idle speed. The defining sign is the engine starting but failing to reach idle RPM, so it remains at a low speed despite continued ignition and fueling. Even though exhaust gas temperature can rise during ignition, that rise isn’t the indicator of a hung start by itself—the critical point is the inability to reach idle. The other conditions describe different issues: excessively high EGT points to an overtemp scenario, normal N1 with a low N2 isn’t the typical hallmark of a hung start, and a normal start that reaches idle is simply a good start.

A hung start happens when the engine ignites and begins to spool but cannot accelerate to the required idle speed. The defining sign is the engine starting but failing to reach idle RPM, so it remains at a low speed despite continued ignition and fueling. Even though exhaust gas temperature can rise during ignition, that rise isn’t the indicator of a hung start by itself—the critical point is the inability to reach idle. The other conditions describe different issues: excessively high EGT points to an overtemp scenario, normal N1 with a low N2 isn’t the typical hallmark of a hung start, and a normal start that reaches idle is simply a good start.