What indicates a successful engine start in turbine engines?

A successful engine start in turbine engines is indicated by a rise in Exhaust Gas Temperature (EGT). During the starting sequence, fuel is introduced into the combustion chamber, which ignites and begins to produce combustion gases. As the engine starts, these gases flow through the turbine, producing thrust and causing the EGT to increase significantly. This rise in temperature is a critical indication that combustion is occurring as intended and the engine is beginning to operate effectively.

Monitoring EGT is crucial in assessing the health and functionality of the engine during startup. A stable and increasing EGT signal indicates that the engine has transitioned from standby to running in its normal operational mode. This is typically followed by other stabilizing conditions, such as RPM increases and air pressure stabilization, but the immediate signature of a successful start is indeed the rise in EGT.