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MIL-PRF-27 Transformers And Inductors \(Audio, Power, And High-Power Pulse\), General Specification ForThis specification covers the general requirements for power transformers, power inductors, audio transformers, audio inductors, high power pulse transformers, charging inductors, saturable transformers and saturable inductors for use in electronic and communication equipment. This specification covers transformers and inductors weighing 300 pounds or less or having root-mean-square \(rms\) test-voltage ratings 0f 50,000 volts or less, and also high-power pulse transformers where the peak pulse power is greater than 5 watts. Transformer and inductor assemblies incorporating any other active or passive components do not come within the scope of this specification.

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MIL-PRF-27G
4.4.1.3 Failure. One or more failures shall be cause for refusal to grant qualification approval.
4.4.2 Qualification inspection of transformers and inductors based on similarity. Qualification inspection shall be
performed only on those transformers and inductors which meet the requirements of A.4.1 of appendix A. Sample
units shall have previously passed all the requirements of the screening tests of table VI for the product level and grade
for which qualification is requested. Extensions of qualification requirements are also specified in appendix A.
4.4.2.1 Sample size. The number of sample units comprising a sample of transformers or inductors to be
submitted for inspection shall be as specified in appendix A.
4.4.2.2 Inspection routine. Sample units shall be subjected to the qualification inspection in table VI, in the order
shown.
4.4.2.3 Failure. One or more failures shall be cause for refusal to grant qualification approval.
4.5 Retention of qualification. When required and for listing on the QPL. To retain qualification, every 60 months,
the contractor shall meet the requirements of 4.4.1 and provide verification of the following requirements:
a.
Design of the transformer or inductor has not been changed.
b.
Conformance tests, and periodic tests have been performed as specified herein.
c.
The contractor retains the capability to manufacture and test transformers or inductors to this specification.
d.
Continued qualification to the product level C shall be based on continued maintenance of qualification for the
product level M.
e.
Continued qualification to the product level C and product level M shall be based on continued maintenance of
qualification for the product level T.
In the event that no production has occurred in this period, the contractor shall still verify to the qualifying activity that
the capability to manufacture and test the QPL transformer or QPL inductor still exists and that the contractor wants to
remain on the QPL.
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