MIL-STD-981C
5.6.4 Classification of inspections. The inspections specified herein are classified as follows:
a. Materials inspection.
b. First article inspection.
c. Quality conformance inspection.
5.6.5 Materials inspection. Materials inspection shall be as specified in MIL-PRF-27, MIL-PRF-15305, MIL-PRF-21038, MIL-T-55631, MIL-PRF-83446 or MIL-PRF-39010 as applicable. However, when a definite material is not specified, a material shall be used which will enable the parts to meet the performance requirements of this standard. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. In addition, polymeric materials
shall be tested for outgassing and hydrolytic stability, when applicable (see 5.1.1, 5.1.2 and 6.2).
5.6.6 First article inspection. (When specified on contract)
5.6.6.1 First article inspection requirements for qualification. First article inspection shall be performed in lieu of the qualification inspection specified in MIL-T-55631 as applicable. Requirements pertaining to First article inspection shall be as specified in MIL-T-55631. Qualification inspection specified under MIL- PRF-27, MIL-PRF-21038, MIL-PRF-39010, MIL-PRF-15305 and MIL-PRF-83446 shall serve as First
article inspection requirements and shall be performed for the applicable part type under MIL-PRF-27,
MIL-PRF-21038, MIL-PRF-39010, MIL-PRF-15305 and MIL-PRF-83446. First article approval is valid only on the contract under which it is granted, for a period not exceeding three years from the date of initial qualification, unless extended by the acquiring activity to another contract, provided that during this period the device has been manufactured at least once during each successive twelve month period.
5.6.6.2 Qualification of transformers and inductors based on similarity. Only a transformer or an inductor having passed the First article inspection requirements of 5.6.6.1 shall be used as the reference device to establish a qualification by similarity. A Class S device shall not be qualified on the basis of similarity. The Class B transformer or inductor to be qualified on the basis of similarity shall be manufactured at the same production facility utilizing the same processes as the reference device.
5.6.6.2.1 Similar transformers and inductors (Class B only)(Families 03, 04, 20, 21, 31, 36,37,
40, 41). A similar device defined as a transformer or inductor that meets the following conditions when compared to the reference device.
a. Same or lower operating temperature.
b. Same or lower operating frequency and the same or lower operating power. c. Same or lower ambient temperature.
d. To be used at an atmospheric pressure of the same or lower altitude.
e. To be used at the same or lower operating voltages and the same or lower dielectric strees per mil of same insulation.
f. Same or lower shock and vibration requirements. g. Same or greater life time expectancy.
h. Same or lower temperature class.
i. Same family as defined in 4.2 thru 4.7.
j. Same grade as defined in the applicable military specifications.
k. Same type of external and internal mounting, same type of case construction with nominal
wall thickness within 25 percent when a case is used, same shape, and same termination (pin or hook terminals).
l. Linear envelope dimensions neither greater than 150 percent nor less than 70 percent of the corresponding dimensions. The total volume of envelope not to exceed 250 percent.
m. Same or greater wire size (cross-sectional area), and the same wire coating material for corresponding windings.
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