Question 70 AEL01 - Assistant Engineer - Limited

The Correct Answer is D **Explanation of why Option D is correct:** A safety shutdown triggered by high lubricating oil temperature indicates a critical failure in the engine's cooling or lubrication system, which can lead to rapid catastrophic damage (e.g., piston seizure, bearing failure) if the engine continues to run or is immediately restarted. 1. **Cool Down is Essential:** High temperatures cause thermal stresses and potential warping of components. Allowing a significant period (typically hours, depending on engine size and ambient temperature) for the engine to cool ensures that temperatures normalize, reducing the risk of personnel injury during inspection and allowing potential heat-related issues (like seized components or degraded oil) to stabilize before troubleshooting begins. 2. **Inspection and Correction Before Restart:** The primary safety principle is to **never** override a safety shutdown without first identifying and correcting the root cause. Attempting to restart without inspection (as suggested in B and C) guarantees further, potentially irreparable, damage to the engine. Option D ensures a structured, safe, and professional approach to maintenance. **Explanation of why the other options are incorrect:** * **A) Immediately perform the engine inspections to determine the cause of the high oil temperature safety shutdown.** This is incorrect because the engine components, especially the lubrication system and engine block, will be dangerously hot immediately after a high-temperature trip. Inspecting immediately exposes personnel to severe burn hazards and does not allow the engine structure to cool and stabilize before detailed inspection can occur. * **B) Immediately restart the engine, and monitor the oil temperature to verify the cause of the shutdown.** This is fundamentally dangerous and incorrect procedure. Restarting an engine that has just tripped on a critical safety alarm (like high oil temperature) is an operational violation that guarantees further and severe damage. The trip already verified the problem; restarting only exacerbates it. * **C) Allow the engine to cool off for two minutes, then restart and monitor the lubricating oil temperature to verify the cause of the shutdown.** Two minutes is completely insufficient time for a large diesel engine to cool down from an overheated state, especially internally. Like option B, immediately restarting the engine without inspection and correction will cause severe damage and ignores the critical failure that caused the trip in the first place.