What does the MPL contain?

• A. Serial number and part number
• B. Manufacturer name and model
• C. Serial number and vendor code
• D. Part number and lot number

Answer: (A)

The key idea is that items are identified by both their type and their unique instance. The MPL (Master Parts List) pairs a part number with a serial number, so you know exactly what item it is (the part type and its specifications) and which specific unit it is (the individual serial). This dual identification is essential for precise traceability, maintenance history, and lifecycle management.

If you only had the part number, you’d know what the item is, but not which specific unit you’re dealing with. If you only had the serial number, you wouldn’t know the standard part type or its configuration. The combination of serial number and part number allows you to track individual units across repairs, replacements, and inspections, tied to the correct part specification.

Other fields like manufacturer name, model, vendor code, or lot number aren’t the primary identifiers for the MPL’s purpose of unique item traceability. Lot numbers group items by production batch, and vendor codes relate to sourcing, not to the distinct identity of each item.