What is one of the steps in the preflight check for the Lav fire extinguisher on the EMB?

Verifying that the gauge is in the green zone is a critical step in the preflight check for the Lav fire extinguisher on the EMB. The gauge provides an indication of the extinguisher's pressure, which is essential for its proper functioning in an emergency. If the gauge is not in the green zone, it suggests that the extinguisher may be undercharged or overcharged, which could prevent it from operating effectively when needed. Monitoring the gauge ensures that the fire extinguisher is ready for immediate use, thus maintaining safety onboard the aircraft.

The other options, while related to the overall condition and readiness of the extinguisher, do not serve the same immediate functional purpose as checking the gauge. Ensuring the inspection sticker is current is important for compliance and maintenance records but does not directly impact the extinguisher's performance. Checking the pin's security is also vital for safety, ensuring the extinguisher cannot be accidentally discharged, but it does not guarantee that the extinguisher is fully charged and ready to operate. Confirming the weight can indicate if the extinguisher has been tampered with or is leaking; however, the pressure gauge is the most direct and immediate indicator of whether the extinguisher can function properly in