MIL-STD-1168C
4.4.5.1.5 S equence numb er ex ceeds "999 ." The next higher interfix number shall be assigned in those rare instances where the lot sequence number for an ammunition item manufactured or assembled by the same manufacturing activity reaches "999" (exceeding three digits). The next lot produced shall require that the sequence number again start with "001."
Example:
The lot number for an item produced by a company with manufacturer's identification symbol "VVV" is VVV97A006-999. The next lot of this item produced will be numbered VVV97A007-001.
4.4.5.1.6 C hange in m anufactur er's identi fic ati on s ymbol . Any conditions which warrant a change in the manufacturer's identification symbol shall require a change in the pertinent interfix number (see 4.2.4). In these instances, the interfix number shall revert
to "001" (exceptions already noted) and the sequence number shall again begin with
"001."
4.4.6 Changes in interfixes for technical reasons.
4.4.6.1 Interruptions. Whenever production or loading of an item is interrupted for a period of time in excess of ninety (90) days, a change in the pertinent interfix number is required. If it is determined that an interruption period less than 90 days should apply, see 6.10.j. This applies even if no physical changes to the production facilities, processes, or personnel occurred during the shutdown. When production resumes, the next sequential interfix number shall be assigned and the lot sequence number shall again begin with "001."
4.4.6.2 Dismantling operations. When a manufacturing activity dismantles a production or loading line and then, at a later date, reassembles and commences production of the same item, such actions shall necessitate a change in the interfix
number to the next higher sequential number. The lot sequence number shall again revert
to "001."
4.4.6.3 Production line configurations. Production line configurations affect how the interfixes are assigned. A goal of the interfix is to identify any changes in manufacturing processes and to enable traceability of suspect product in the event of any problems during production or in the future during lifecycle management. The following direction applies for the production of lots of the same item.
a. If there is a production line with a number of operations performed in series to create lots of the same item, then only one interfix is required at a time.
b. If a production line is reconfigurable, then the interfix shall change each time the line is reconfigured to produce a different item. This process shall also follow the block of interfix procedure described in 4.4.3.1 to assign blocks of interfixes to the different models.
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