MIL-STD-690D
w/ CHANGE 1
5.2 Procedure II, "Extension of qualification to lower FR levels". The manufacturer may extend the qualification granted under Procedure I to a lower FR level. Approval by the qualifying activity of such an extension shall be based on the same sampling plan, test duration, and failure criteria of Procedure I and the additional criteria prescribed in the procedure.
5.2.1 Applicable data.
a. Data shall be accumulated from ER tests performed during qualification at the initial FR level maintenance of qualification, and extended FR tests, and when specified, from lot conformance FR inspection.
b. Any data used to extend qualification shall include the results of all FR tests performed during the production period represented by the data. Data shall represent successive inspection tests starting with current production to the date of the oldest data submitted.
c. Unless approved by the qualifying activity in accordance with MIL-STD-790, the data shall represent a product which has not changed significantly (in terms of process, material, design, or construction) during the production period.
* d. Extension of qualification to levels "P", "R", "U", "S" or "V" shall not be granted based upon data which are wholly from incomplete FR tests. As a minimum, data from completed FR tests on the same sample size as that required for initial qualification shall be included in the total data submitted. Where the ER specification contains specified life acceleration factors and associated accelerated life tests, data from completed accelerated life test shall be considered as equivalent to data from completed extended FR tests (see 4.1a).
e. Data from FR tests conducted to specifications other than ER specification for which qualification is desired may be submitted for consideration to the qualifying activity. Complete information concerning the specification tested to the test procedures or requirements should be provided to support the validity of the data. Only data generated under conditions equal to or more stringent than those specified in the applicable ER specification shall be considered as valid.
* 5.2.2 Extent and limitation of coverage. Extension of the initially qualified FR level to the next lower level shall be within the same limits of qualification coverage as the initial qualification submission.
Example: When initial qualification is limited to the individual style submitted, the next lower FR level qualification shall be on the same basis. When extension of a qualified level to lower levels (such as "P" (0.1%/1,000 hrs.) to "R" or "U" (0.01%/1,000 hrs.) or "R" or "U" (0.01%/1,000 hrs.) to "S" or "V" (0.001%/1,000 hrs.)) is involved, consideration may be given to the combining of data from two or more styles of similar construction. In these cases, when permitted by the ER specification, permission to combine the data shall be obtained from the qualifying activity and shall be based on the similarity of design, construction, materials, and requirements of the styles involved. When data from two or more styles are combined, the data shall also be separately recorded for each style. Extension of qualification shall cover only the styles represented by the data (see 4.1a).
5.2.3 Details to be specified. The extent and limitation of coverage (see 5.2) is to be specified in the ER
specification.
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