MIL-PRF-21038F
APPENDIX
PROCEDURE FOR QUALIFICATION INSPECTION
A.1. SCOPE
A.1.1 Scope. This appendix details the procedure for submission of samples for qualification inspection of
transformers covered by this specification. The procedure for extension of qualification is also outlined herein. This
appendix is a mandatory part of the specification. The information contained herein is intended for compliance.
A.2. SUBMISSION
A.2.1 Product levels. Qualification of C level product is predicated upon meeting the qualification requirements as
described herein for M level product. Qualification of the high reliability T level is predicated upon meeting
qualification requirements for the M level and the capability to perform the additional conformance inspections
required in group A.
A.2.2 Sample. This submission procedure prescribes qualification to the M level. A sample consisting of eight
transformers shall be subjected to the tests of table I. Unless otherwise specified (see A.2.1), the sample shall be a
specific part from a given specification sheet and selection of the specific PIN for qualification is the option of the
manufacturer. If the manufacturer does not certify to the fungus requirements, then one additional sample is required.
This qualification sample can be the basis for extending qualification to families of similar products (see A.3.1 of
appendix) and also extending qualification to C level product and T level product (see A.3.2 of appendix).
A3. EXTENT OF QUALIFICATION
A.3.1 Extension of qualification. The qualification sample selected in accordance with A.2.1 of appendix can be
used as the basis for extending qualification to similar transformers (i.e., other than the PIN selected in A.2.2 of
appendix). Generally this extension shall be in accordance with the following requirements, however, the
manufacturer may propose additional extensions for approval by the qualifying activity. (NOTE: The specific
specification sheet may provide additional recommendations for part qualification extensions.)
a.
Extension of qualification may be granted for similar products in a given specification sheet. Typically, these
products would be manufactured using the same or similar materials (e.g., same plastics for the case, same
lead materials and finishes.).
b.
Products must be manufactured in the same facility using manufacturing processes and materials that were
used to manufacture the product originally qualified.
c.
If the manufacturer wants to extend qualification to additional lead and terminal finishes other than that
originally qualified, qualification will be based on certification by the manufacturer that all requirements of this
specification are met by the alternate lead/finish.
To facilitate consideration of alternative extent of qualification proposals, the qualifying activity may request the
manufacture to demonstrate capability by existing internal test data similar to the group A and group B inspections.
A.3.2 Extension of qualification from M level to C level and T level. Upon successful qualification of M level, the
manufacturer may request qualification to C level and T level of this specification. The products involved shall be the
same design and manufactured in the same facilities using the same processes and materials as the M level parts. C
level and T level qualification will only be granted for the same envelope of products for which M level qualification
was granted (see A 3.1).
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