MIL-STD-1168C
4.5.2 Correctness of lot sequence numbers. Additional or specific requirements for lot sequence numbers may be in the lot formation requirements defined in the TDP or the contract. The applicable lot(s) shall not be accepted if the lot sequence number is incorrectly applied.
4.5.3 Changes in lot sequence numbers. All conditions which necessitate a change in the lot interfix number shall also manifest themselves in a change in the lot sequence number (see 4.4.3, 4.4.4, 4.4.5, 4.4.6 and all subparagraphs thereof). Actions which require changes in lot sequence numbers to the next higher sequential number and where the interfix remains unchanged are described in each of the following events:
4.5.3.1 For administrative purposes.
4.5.3.1.1 Time. Lot sequence numbers may be required to change when the contractually stipulated time frame for a lot has been attained. Frequently, the contract states that specific production time frames such as a shift, a day, a week, a month, etc., shall constitute a production lot, regardless of the quantity produced during the period. When such requirements have been met, a new lot sequence number, continuing in the sequence of the previous production, shall be assigned.
4.5.3.1.2 Quantity. Lot sequence numbers may be required to change when the contractually stipulated quantity has been produced. In certain instances, a contract states that a particular number of units such as 5,000, 10,000, 20,000, etc., shall constitute a production lot regardless of the length of time required to produce such an amount.
When such requirements have been met, a new lot sequence number, continuing in the order of the previous production, shall be assigned.
4.5.3.2. For technical reasons.
4.5.3.2.1 Interruptions. When production or assembly of an item is interrupted and resumes again after a time lapse of more than thirty (30) days, a new lot sequence number, continuing in the order of the previous production, shall be assigned provided no design changes were made in the interim or the method or production was not altered.
4.5.3.2.2 Homogeneity. Lot sequence numbers shall be changed to ensure that the material in the lot is homogenous and can be expected to perform in a uniform manner (see 3.2.3 and 3.2.11). If a lot was originally determined by a different method, such as
by time or quantity, and it is determined that the material is not homogenous, then the sequence numbering method shall be changed and lots determined based upon homogeneity instead. Additionally, lot sequence number changes shall conform to the lot formation and homogeneity restrictions in place in other documentation such as the specifications, drawings, or contract.
Example:
A lot of material is made via a batch process. The lots are normally determined by a quantity of time (see 4.5.3.1.1) such as a one month period. Testing found
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