Salt water ballast is to be discharged into the #6 port and starboard wing tanks. Which combination of valves, illustrated, must be opened, and which valves should be closed? GS-0139

Correct Answer: Option C — 1, 3, 5, 6, 8 and 10 open; 2, 4, 7 and 9 closed.

To direct ballast flow to specific wing tanks, the suction and discharge valves must be aligned to create a path from the sea chest to the tank manifold. Opening valves 1, 3, 5, 6, 8, and 10 establishes this flow path while isolating the system from other tanks and overboard discharges.