What is the second step in the emergency engine shutdown on the ground?

The second step in the emergency engine shutdown on the ground is to pull the firewall shutoff handle. This action is crucial as it isolates the engine from its fuel supply, effectively stopping fuel from reaching the engine, which is essential during an emergency situation.

In the context of aircraft operations, the procedure is designed to quickly stop an engine that may be malfunctioning or on fire. Pulling the firewall shutoff handle cuts off fuel flow and aids in mitigating further risks, such as an explosion or additional fire spread.

Understanding this step’s significance underlines the operational priority of securing the aircraft and crew's safety during an emergency. The other steps, such as turning the power control lever (PCL) off or initiating the engine shutdown, are part of the overall process but are not the immediate second action required after recognizing the need for an emergency shutdown.