Part Number - The part number is the "master" record identifier for the entire system. It is normally the number given to the part by its manufacturer to identify the particular part.
When available, you can click on the List with Part Numbers

icon to display the pop-up window and select a valid Part Number.

NOTE: We strongly suggest that you use the Part Number identified on the Certificate of Airworthiness, Part Label and/or Manufacturers documentation (IPC, CMM, etc.).