Hung start

Understanding the Concept of “Hung Start” in Gas Turbine Engines

Hung start is a term used in reference to the condition of a gas turbine engine, where there is a normal light off but the RPM remains at some low value rather than increasing to the normal idle RPM. The primary cause of the hung start is the insufficient power required for the engine to initiate from the starter.

It is important to note that a hung start is a dangerous condition and may cause significant engine damage if not attended to immediately. In such a circumstance, the engine should be shut down as soon as possible to avoid any further damage.

The phenomenon of a hung start occurs due to various reasons, including problems with fuel supply, electric control systems, and mechanical torque. Many modern gas turbine engines are equipped with advanced systems that help prevent hung-start issues. These systems help ensure the engine receives sufficient power needed during the start-up process.

Factors such as temperature, altitude, and engine type also play a crucial role in causing a hung-start event. Therefore, engine manufacturers conduct rigorous testing and analysis to minimize the risk of hung start and ensure the safety and reliability of the engine.

In conclusion, a hung start is a condition where a gas turbine engine starts, but the RPM remains at some low value rather than increasing to the normal idle RPM. It is a dangerous situation that may damage the engine and should be avoided by promptly shutting down the engine. Engine manufacturers continuously innovate and develop advanced systems to prevent hung start and ensure the safety and reliability of gas turbine engines.