When a need is determined, phase maintenance kits are built based on the material requirements listed in which of the following sources of maintenance information?

The correct choice for building phase maintenance kits based on material requirements is the Maintenance Requirement Card (MRC). MRCs provide detailed instructions and specific material requirements necessary for maintenance tasks, including the parts and equipment needed to perform those tasks effectively. They are designed to ensure that maintenance personnel have the correct tools, materials, and methods at their disposal when servicing equipment.

MRCs are part of the Navy's standard maintenance documentation and play a critical role in ensuring the reliability and readiness of naval equipment. By using MRCs, personnel can identify the exact items required for maintenance operations and build the phase maintenance kits accordingly, ensuring that all required materials are readily available when maintenance is performed.

While other sources, such as the Maintenance Manual, Logistics Data Sheet, and Equipment Catalog, provide important information related to maintenance, they do not concentrate specifically on the material requirements for maintenance actions in the same way that MRCs do.