Question 342Safety & Environmental - 1st Asst/Chief

The correct answer is C) "A" class bulkheads must not allow flame or smoke passage for 60 minutes when subjected to a fire test. The "A" classification for bulkheads refers to their fire-resistance rating, which requires them to maintain their integrity and prevent the passage of flame and smoke for a minimum of 60 minutes when subjected to a standard fire test. This is in accordance with the international safety regulations for construction and equipment of ships, which specify the fire performance requirements for different classes of bulkheads and other ship structures. The other answer choices are incorrect because they do not accurately reflect the fire-resistance time requirement for "A" class bulkheads, which is 60 minutes, not 15, 30, or 120 minutes.