MIL-STD-1168C
increase the rate of manufacture. This modification requires a change in interfix number.
4.4.6.4.1 Production line splitting. If an existing production line is split into two or more production lines, then different block(s) of interfix numbers shall be assigned for those lots produced on the "new" production line(s). The lots being produced on the original production line shall continue with the old interfix number and in the lot sequence number order previously used until such time as a change is effected which normally requires an interfix number change. All changes and further assignment of interfix numbers shall be accomplished in accordance with the provisions of 4.4.
4.4.6.4.2 Production line merging. If two or more existing production lines are merged into a single line, then the lots produced on the new single line shall be assigned a different interfix number in sequence to the next highest number of those interfix
numbers used previously on the separate lines. The lot sequence number shall again
begin with "001."
Example:
Two (2) lines are producing lots with lot numbers VVV09H007-014 and VVV09H015-003. After the two (2) lines are merged the next lot produced on the new single production line will be numbered VVV09J016-001.
4.4.6.5 Same item - new designs. Lots of the same item made to new designs
shall be assigned different interfix numbers to the next higher interfix number with the lot sequence number reverting to "001" as shown in examples 1 and 2. However, when the basic model number changes, then the interfix number shall start over at "001" commencing with the first lot produced under the new basic model number. An example of this situation is presented in example 3.
Example 1:
A change in designation from igniter, rocket motor, M23A1 to igniter M23A2 will require a change in interfix number to the next higher interfix number. If the final production lot of the M23A1 was NNN97H011-007, then the first lot of the M23A2 would be numbered NNN97J012-001.
Example 2:
The final production lot of the rocket, M72A1, 66mm was NNN97D016-012. Extensive changes are made. As a result, only the rocket motor, rocket launcher, and igniter system remain the same. The changes are reflected by merely changing the model number to M72A2. The first production lot of the M72A2 would be numbered NNN97L017-001.
Example 3:
The M52A2 fuze is last produced in 1970. After a 40 year lapse, production is again started. However, some changes are made, such as altering a timing delay through an arming slider mechanism. The fuze model number is changed to
21
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