Drawings of your deck plans show the use of A60 bulkheads. "A" indicates which of the following?

Correct Answer: Option C — "A" class bulkheads must not allow flame or smoke passage for 60 minutes when subjected to a fire test

Structural fire protection standards defined in 46 CFR 72.05 classify bulkheads based on their ability to resist fire. An A-60 rating signifies that the bulkhead must prevent the passage of smoke and flame for a duration of 60 minutes during a standard fire test, maintaining the vessel's fire-rated subdivision boundaries.