MIL-PRF-28861D
4.4.1.2 Test routine. Qualification samples shall be subjected to the tests of table III. All sample units shall be
subjected to the tests of group I. The sample filters shall then be divided into five groups and subjected to the tests of
groups II, III, IV, V, and VI in the order shown.
4.4.1.3 Failures. Failures in excess of those allowed in table III shall be cause for refusal to grant qualification.
4.4.2 Class S filters. Initial qualification to class S will be granted under the following provisions:
a. Class B qualification (class S qualification will be limited to those products qualified to class B).
b. Pass the class S product audit.
4.4.3 Verification of qualification.
4.4.3.1 Class B filters. To retain qualification, every 12 months the manufacturer shall provide verification of
qualification to the qualifying activity. Continued qualification is based upon meeting the following:
a. MIL-STD-790 program.
b. The filter design has not been modified.
c. Group A inspection requirements are met.
d. Group B inspection requirements are met.
In the event that no production occurred during the reporting period, a report shall be submitted certifying that the
company still has the capabilities and facilities necessary to produce the item. If during two consecutive reporting
periods there has been no production, the manufacturer may be required, at the discretion of the qualifying activity, to
submit his qualified products to testing in accordance with the qualification inspection requirements.
4.4.3.2 Class S filters. To retain qualification for class S filters, the manufacturer shall provide verification of
qualification at 12-month intervals to the qualifying activity. The qualifying activity shall establish the initial reporting
date. Continued qualification is based upon meeting the following:
a. Continued class B qualification on the same device type.
b. The filter design has not been modified.
c. Group A inspection requirements are met.
d. Group B inspection requirements are met.
e. Lot-by-lot analysis as specified by the qualifying activity.
In the event that no production occurred during the reporting period, a report shall be submitted certifying that the
company still has the capabilities and facilities necessary to produce the item. If during two consecutive reporting
periods there has been no production, the manufacturer may be required, at the discretion of the qualifying activity, to
submit his qualified products to testing in accordance with the qualification inspection requirements.
4.4.3.2.1 Records. Test records shall be in accordance with the format in MIL-STD-790. The manufacturer shall
maintain the DPA samples, x-ray films or real time x-ray digital images, and group B samples for a minimum of 5
years.
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