As a 3rd Assistant Engineer, what should you check if you experience fluctuating lube oil pressures in rough weather?

When faced with fluctuating lube oil pressures in rough weather, it is essential to refer to the round sheet for the last steady level taken. This sheet provides a historical record of lube oil pressure readings and other key operating parameters. By reviewing the last steady level, you can identify if the fluctuations are consistent with prior performance or if they represent a new or problematic trend. This context can help you determine if the fluctuations are due to external conditions or potential issues in the lubrication system itself.

Monitoring historical data enables an engineer to correlate the current situation with past trends, assessing whether the lube oil pressure should be expected to vary under certain conditions. In contrast, while checking the oil pump function, fuel oil levels, and temperature gauges can also be relevant in diagnosing engine performance issues, they do not provide the direct historical context needed to properly assess the significance of the current fluctuations in pressure. Thus, referring to the round sheet is critical for making informed decisions and ensuring the engine's reliable operation in challenging conditions.