7. During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?

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"a" class bulkheads must not allow flame or smoke passage for 60 minutes when subjected to a fire test

7. During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. «A» indicates which of the following?

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7. During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. «A» indicates which of the following?

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