MIL-PRF-27G
APPENDIX A
PROCEDURE FOR QUALIFICATION INSPECTION
A. SCOPE
A.1 Scope. This appendix establishes an evaluation system for transformers and inductors manufactured in
accordance with this specification. The manufacturer must maintain and demonstrate this system to the qualifying
activity as a prerequisite for qualification and retention of qualification. This appendix is a mandatory requirement of
this specification. The information contained herein is intended for compliance.
A.2. APPLICABLE DOCUMENTS. This section is not applicable.
A.3. SUBMISSION
A.3.1 Product levels. Qualification of the C level is predicated upon meeting the qualification requirements for M
level (see A.4.1). Qualification of the T level can be the basis for extending qualification to the M level and also the C
level (see A.4.1). The procedure for submitting samples to become qualified for the M level and T is specified in A.3.2
A.3.2 Sample.
A.3.2.1 Single-type submission. A sample consisting of seven of each type of transformer or inductor for which
qualification is sought must be subjected to the tests of table V. Three sample units must be subjected to the
inspections of group I. Seven sample units which include the three units from group I must be subjected to the
inspections of group II. Five sample units must be subjected to the inspections of group III. The two remaining
sample units from group II must be subjected to the inspection of group IV. Two additional sample units will be
required for group V, if the fungus test is performed.
A.4. EXTENSION OF QUALIFICATION
A.4.1 Extent of qualification by similarity. The qualification sample selected in accordance with 3.1 of appendix
can be used as the basis for extending qualification to similar transformers (i.e., other than the PIN selected in 3.2 of
appendix). Generally this extension must 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, etc.).
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.4.2 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 must 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 4.1). To obtain qualification to the T level, the manufacturer must also meet additional
requirements in Group A subgroup I as well as being approved by the qualifying activity on the capability to conduct
tests and examinations for T level product.
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