What should you do if you experience a hung start during the engine start sequence?

Experiencing a hung start during the engine start sequence means that the engine has not reached its intended RPM and stabilization, indicating that the start process is not proceeding normally. In this situation, the appropriate action to take is to turn the affected engine to STOP.

This procedure is crucial because allowing a hung start to continue may risk engine damage or an unsafe condition. By shutting down the affected engine, you remove the risk of further complications while also allowing for a safe environment to diagnose and rectify any issues related to the start failure.

Continuing with the start process, increasing thrust, or shutting down all engines would not address the specific issue of the hung start and could lead to more serious operational problems or safety hazards. Thus, turning the affected engine to STOP is a critical step in engine management and safety protocols during the starting procedure.