MIL-STD-1OOG
d. When the CAGE Code is shown in the PL, it may be omitted from the part callout on the face of the drawing.
406.12 Numbering of related parts. Numbers to identify special relationships between parts shall be assigned as follows:
406.12.1 Matched part designation. Matched parts shall be marked with the word "SET" next to the PIN assigned to identify the matched set or pair of parts. See also ASME Y14.24M.
406.12.2 Symmetrically opposite (mirrored) parts. Symmetrically opposite parts, if not described by separate drawings, shall be described using one of the following methods:
a. Detail each part in a separate view. Each part shall be identified by the suffix identifier system. See 406.6. Do not specify "SHOWN" and "OPPOSITE".
b. Detail one of the parts in a view and identify each part by the suffix identifier system. See
406.6. For example, include on the drawing under the view the designation "765432-1 SHOWN" and "765432-2 OPPOSITE" or "-1 SHOWN" and "-2 OPPOSITE". The use of odd suffix identifiers for the parts shown and even suffix identifiers for the opposite parts is preferred. This method is useful if the view is clear enough to distinguish the opposite part.
406.12.3 Inseparable assembly. When two or more pieces are permanently fastened together by welding, riveting, brazing, cementing, bonding, or other processes to form an inseparable assembly, the assembly shall be assigned an identifying number. The individual pieces may be assigned PINs as described in 406.10 and called out on the inseparable assembly.
406.13 Change requiring new identification. When a repair part within an item is changed so that it is no longer interchangeable with its previous version, it shall be assigned a new PIN. A new PIN shall also be assigned to the next higher assembly for the changed repair part and to all subsequent higher assemblies up to and including the level at which interchangeability is re- established. The design or procuring activity shall assign new PINs when a part or item is changed in such a manner that any of the following conditions occur:
Condition 1. Performance or durability is affected to such an extent that superseded items must be discarded or modified for reasons of safety or malfunction.
Condition 2. Parts, subassemblies, or complete articles are changed to such an extent that the superseded and superseding items are not interchangeable.
Condition 3. When superseded parts are limited to use in specific articles or models of articles and the superseding parts are not so limited to use.
Condition 4. When an item has been altered, selected, or is a source control item. (see Chapter
200 and ASME Y14.24M)
406.13.1 Computer program. When an item is changed in such a way that it necessitates a corresponding change to a computer program for operation, self test or maintenance test, the PIN of the item and its next assembly and all progressively higher assemblies shall be changed up to and including the assembly where computer programs are affected.
406.14 Changes not requiring new identification. When a part or assembly is changed in such a manner that conditions of 406.13 do not occur, the PIN shall not be changed. Under no condition shall the PIN be changed only because a new application is found for an existing part. When an item has been furnished to the Government, the applicable PIN shall not be changed unless conditions in 406.13 apply. However, when a design activity desires to create a tabulated
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