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

Correct Answer: Option C — Annually.

46 CFR 95.15-15 requires fixed CO2 systems to be inspected annually to verify that cylinder contents are within 10% of the stamped full charge weight. This periodic verification ensures that sufficient extinguishing agent is available to flood the protected space effectively in the event of a fire.