How often must CO2 systems be inspected to confirm cylinders are within 10% of the stamped full weight of the charge?

Correct Answer: Option C — annually

46 CFR 109.223 requires that CO2 cylinders be weighed annually to ensure they remain within 10% of their stamped full charge weight. This inspection is critical to verify that the fixed fire extinguishing system retains sufficient agent capacity to effectively suppress a fire in the protected space.