MIL-STD-1168C
assembly of such items is accomplished, as noted herein and in accordance with the provisions of 4.4.3, 4.4.5.1.1, 4.4.5.1.3.3, 4.4.6.3, and 4.4.6.4.
The following reflects the situations noted above:
4.4.5.1.3.1 Different type projectiles. Different type projectiles of the same caliber manufactured or assembled by the same manufacturing activity shall be assigned different blocks of interfix numbers. However, projectiles of different calibers may be assigned the same interfix number.
4.4.5.1.3.2 Different type cartridge cases. Different type cartridge cases of the same caliber manufactured by the same manufacturing activity shall be assigned different blocks of interfix numbers. However, cartridge cases of different calibers may be assigned the same interfix number.
4.4.5.1.3.3 Different rounds of the same caliber. Different complete round items of the same caliber assembled at the same facility shall be assigned different blocks of interfix numbers. However, complete rounds of different calibers may be assigned the same interfix number.
Example:
A LAP facility is loading the 81mm cartridge, M375. The lot currently being produced is numbered NNN97H011-006. At this point the same plant starts production on the 81mm cartridge, M374. The M374 cartridge production will be assigned a block of interfix numbers, preferably "020" through "039." The first M374 cartridge lot number would be NNN97H020-001, etc. When the M375 cartridge production finished the "019" interfix, interfix block "040" through "059" should then be assigned. These procedures are in accordance with 4.4.3.1.
4.4.5.1.3.4. Different type bombs or rocket motors. Different type bombs of the same size with identical manufacturer's identification symbols shall be assigned different blocks of interfix numbers, but bombs of different sizes may be assigned the same
interfix number. These procedures also apply to rocket motors.
4.4.5.1.4 New contract. Whenever a new contract is issued to the same manufacturing activity for the same item, the materiel delivered under the new contract shall have a new interfix number assigned. Interfix number assignments from one contract to the next shall be issued in the normal sequence, or in accordance with the exceptions noted within this standard (see 4.4.3). Lot sequence numbers shall again begin with "001." The interfix number shall not revert back to "001" when production commences under a new contract for the same item with the same manufacturer's identification symbol, regardless of the number of years which may have elapsed since production or loading of the item was completed under the previous contract. The exception to this is if the manufacturing activity has run out of interfix numbers as discussed in 4.4.3.
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