Final answer:
The 25ft lanyard is hooked to a fail-safe device called the "dead man switch" in the event of firing lever or linkage failure.
Step-by-step explanation:
In the event of firing lever or linkage failure, the 25ft lanyard is hooked to a fail-safe device known as the "dead man switch". This device is designed to automatically stop or disable the firing mechanism if the lever or linkage fails.
When the firing lever or linkage fails, the 25ft lanyard is connected to the dead man switch, which is typically located near the operator or in a convenient location for easy access. This ensures that if the lever or linkage fails, the lanyard can be pulled to activate the dead man switch and prevent any accidental firing during maintenance or operation.