MIL-STD-1168C
XM717 with the intention of creating a separate identity from the original M52 fuze series. Then only at this point will the manufacturing activity revert back to a "001" interfix for the item. The lot number would then be NNN10D001-001.
4.4.6.6 Explosives and chemicals. Unless otherwise specified (see 6.5), for explosives and chemicals including black powder, blank powder, nitrocellulose, etc., the interfix number shall be used to designate different types, grades, or classes of the same material.
Example:
Aluminum powder, type 1, grade 1, class 1 will be assigned interfix "001." For aluminum powder, type II grade 1, class 1 the interfix number will be "002." Any change in any designations of the basic item will necessitate a change in the interfix number.
4.4.6.7 Best interest of the Government. Changes in interfix numbers shall also
be accomplished when it is determined that it is necessary to change or the best interest of the Government will be served by changing interfix numbers (see 6.10.g).
4.4.7 Documenting changes in interfix numbers. Whenever changes in interfix numbers are effected, all such changes shall be appropriately documented on the ADC (see 6.10.a). Any and all reasons for interfix changes shall be clearly and precisely stated on the card for the first lot of the new interfix number. These comments shall be inserted in the remarks block of the ADC.
4.5 Ammunition lot number - lot sequence number.
4.5.1 Lot sequence number description. The three (3) digit lot sequence number identifies a lot according to the sequence of production, within each lot interfix number. A sequence number shall be assigned to each lot produced regardless of the final disposition (see 4.1.2). The lot sequence number within each interfix shall always begin with "001" and continue sequentially to a maximum of "999." The lot sequence number shall also begin with "001" following a successful first article.
Example:
A manufacturing activity submits lot XYZ12C001A001 as a first article sample. The first article test failed. The manufacturing activity then produces XYZ12D001A002 as a second First Article submission. This lot passed and the manufacturing activity was given permission to start production with lot XYZ12E001-001.
Note: First article failures often require significant corrective actions or production changes. These did not require interfix changes at this point because the production line configuration had not yet been approved.
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