Final answer:
During engine start, if the EGT is rising rapidly or exceeds the specified limit, it is necessary to shut down the engine to prevent damage and ensure safety.
Step-by-step explanation:
During engine start, if the Exhaust Gas Temperature (EGT) is rising rapidly or exceeds the specified limit, it is necessary to shut down the engine. The specific limit may vary depending on the type of engine and the manufacturer's recommendations. EGT is an important parameter to monitor because exceeding the limit can lead to engine damage, such as turbine blade failure, or even catastrophic failure.
For example, in aircraft engines, the EGT is closely monitored during start-up. If the EGT rises too quickly or goes beyond the upper limit, it indicates a potential problem, such as a fuel leak or combustion issue. In such cases, shutting down the engine is essential to prevent further damage. Overall, monitoring EGT during engine start ensures the safety and proper functioning of the engine, preventing potential damage and ensuring optimal performance.