What procedure is followed to take a LO sample?

To take a LO (Lubricating Oil) sample, the correct procedure involves using the Maintenance Requirement Card (MRC). This card is a key document that outlines the specific maintenance tasks required, including those for sampling lubricating oil. It provides detailed instructions and requirements for the proper sampling process, ensuring that the procedure meets safety, quality, and regulatory standards.

The MRC also helps technicians understand the frequency of sampling, the correct techniques, and any safety precautions that need to be taken. By adhering to the MRC, personnel can ensure that they follow best practices, which is crucial in managing and monitoring the condition of lubricating oil.

The other options, while they may have relevance in maintenance and operation procedures, do not specifically address the sampling of lubricating oil. The Maintenance Procedure Sheet focuses on specific maintenance procedures rather than sampling; the Lubrication Operation Procedure deals with lubrication tasks more broadly; and the Technical Requirement Card generally does not pertain directly to sampling processes. Therefore, the MRC is the most applicable choice in this context.