DI-S-1818A (Continued) Code Explanation BLANK Not required (Not necessary to remove from data base, if entered). A Mandatory for all items. X Required if appropriate. P Required for Contractor Recommended/Procuring activity selection. R Required for reparable assemblies (Repairability Codes 0, F, H, D). S Required if card is submitted. SEE NOTES APPENDED HERETO FOR SUPPLEMENTAL INSTRUCTIONS AS NOTED IN REMARKS COLUMN. APPENDIX A REGULATOR CODES Reference number category codes (RNCC). The RNCC indicates the category or relationship of the reference number to an NSN or other reference number. Code Explanation 1 Source control reference. The number assigned by design control manufacturer of an end item or equipment, including a Government activity, to a drawing which restricts procurement to the specified item(s) described on the drawing and to the stated source(s) of supply designed thereon. These restrictions are imposed by the cognizant design activity to insure procurement of the only item(s) known, as a result of test or evaluation, to be satisfactory for the stated critical application. Includes only those drawings which meet the definition for "source control drawing" in MIL-STD-100. Definitive Government specifications or standard designator reference. A part number, style number, or type designator included in, or developed in accordance with a Government specification or standard which has the effect of fully identifying an item or supply. This code shall also be used for a Government specification or standard which, although not including part numbers, style numbers, or type designators, cover a single item of supply. 2 3 Design control reference. The primary number used to identify an |