What is the first step in the PPPS operating instructions for fire extinguishers?

In the context of using fire extinguishers, the first step outlined in the PPPS operating instructions—often referred to as the PASS technique—is to pull the safety pin. This action prevents accidental discharge of the extinguisher and allows the user to prepare for effective use. By pulling the pin, you disable the locking mechanism, making it possible to operate the extinguisher safely. This foundational step sets the stage for the subsequent actions of aiming the nozzle, squeezing the handle, and sweeping from side to side to effectively extinguish flames. Understanding the rationale behind this order is crucial, as it emphasizes the importance of safely preparing the extinguisher before attempting to combat a fire.