What is the first step in the PASS technique for using a Type B extinguisher?

The first step in the PASS technique for using a Type B extinguisher is to pull the pin. This action is crucial because it unlocks the operating mechanism of the extinguisher, allowing the user to discharge the extinguishing agent. Without pulling the pin, the extinguisher cannot be activated, rendering it ineffective in combating the fire. The pin serves as a safety feature to prevent accidental discharge during transport or handling. Once the pin is removed, the user can proceed to follow the subsequent steps of aiming at the base of the fire, squeezing the handle, and sweeping side to side to effectively extinguish the flames. Understanding this initial step ensures that the extinguisher can be operated safely and effectively in an emergency situation.