Question 340Safety & Environmental - 1st Asst/Chief

The correct answer is B) "B" class bulkheads must not allow flame passage for 30 minutes when subjected to a fire test. According to the regulations, "B" class bulkheads are required to provide a certain level of fire resistance. Specifically, "B" class bulkheads must not allow flame passage for at least 30 minutes when subjected to a standard fire test. This is to ensure that in the event of a fire, the bulkhead can contain the flames and provide sufficient time for evacuation and firefighting efforts. The other options are incorrect because they specify different fire resistance requirements that do not match the definition of a "B" class bulkhead. Option A is too low, Option C is too high, and Option D is significantly higher than the actual requirement for a "B" class bulkhead.