What does the term "Hot Start" refer to in jet engine operation?

The term "Hot Start" in jet engine operation specifically refers to a condition where there is an excessively rich fuel mixture during engine start, leading to a rapid increase in exhaust gas temperature (EGT). When a jet engine starts with too much fuel and not enough air, the combustion process becomes inefficient, causing a significant rise in temperature within the combustion chamber. This can occur if the engine's fuel control system malfunctions or if the starting procedures are not followed correctly, resulting in an unsafe situation that could potentially damage the engine if not managed properly. Understanding this phenomenon is crucial for maintenance technicians, as it highlights the importance of proper fuel-air mixture regulation and monitoring during engine starts to ensure safe and effective operation.