What is the first step in the PASS application method?

The first step in the PASS application method is to pull and twist the pin to break the seal. This action is crucial as it allows the firefighter to access the fire extinguisher's contents. The pin serves as a safety feature that prevents accidental discharge of the extinguisher, ensuring that it remains secure until needed. By pulling and twisting the pin, the firefighter can prepare to use the extinguisher effectively and proceed with the remaining steps in the PASS method. This sequence of actions is essential for ensuring the extinguisher operates safely and efficiently when tackling a fire.