Referring to the illustration, what would be the result if the upper oil/water interface detection probe became faulty? GS-0175

Correct Answer: Option C — The unit would not be able to transition from ending the oil discharge mode to initiating the separation processing mode.

The upper probe monitors the oil-water interface to terminate oil discharge. If faulty, the system cannot detect when the oil layer has been fully evacuated, preventing the transition back to the separation processing mode. This logic is critical for maintaining MARPOL compliance and preventing overboard discharge of oily water.