MIL-DTL-28748D
4.2.4 Assembly distributor. Assembly distributors must be listed on, or approved for listing on, the applicable qualified products
list. The qualified connector manufacturer shall certify that the assembly distributor is approved for the distribution of the
manufacturer's parts. The assembly distributor shall use only piece parts supplied by the qualified connector manufacturer. No
testing other than visual examination is required of certified piece parts obtained from the qualified connector manufacturer, except
when there is cause for rejection. All assemblies produced at the assembly distributor's plant shall be subjected to examination of
product to assure that the assembly process conforms with that established at the qualified manufacturing plant. Quality control
requirements, including Government inspection surveillance, shall be the same as required for the qualified connector manufacturer.
4.2.5 Statistical process control (SPC). A SPC program shall be established and maintained in accordance with EIA-557.
Evidence of such compliance shall be verified by the qualifying activity as a prerequisite for qualification and retention of qualification.
4.3 Materials inspection. Materials inspection shall consist of certification supported by verifying data that the materials, as
specified in 3.3 and on the specification sheets (see 3.1), used in fabricating the connectors, are in accordance with the applicable
referenced specifications or performance requirements prior to such fabrication (see 3.5, 4.7.2, and 6.2).
4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the Government (see 6.3)
on sample units produced with equipment and procedures normally used in production. Use of alternate materials, plating, and
processes shall be identified for inclusion in the product test documentation (see 3.3.1).
4.4.1 Preparation of samples.
4.4.1.1 Contacts. Preparation of samples; MIL-C-39029/34, /35, /36, and /37 contacts shall be wired using wire conforming to
MIL-W-22759.
4.4.1.2 Shields (if applicable). Shields shall be assembled.
4.4.1.3 Connectors. Completely assembled plugs or receptacles, complete with guide pins, jackscrews, back-up plates, contacts,
and shields (if applicable) shall be subjected to qualification inspection as follows.
4.4.1.3.1 Connectors with nonremovable or removable contacts. The completely assembled plugs and receptacles (six each for
crimp terminations and eight for non-removable contacts), with the insert arrangement of the largest size connector in accordance
with the applicable military specification sheet, and two each completely assembled plugs and receptacles for all other connector
sizes for which qualification is desired shall be submitted.
4.4.1.3.2 Nonremovable contacts. Forty sets of pin and socket contacts shall be subjected to qualification inspection.
4.4.2 Inspection routine. The sample shall be subjected to the inspections specified in tables IX and X, as applicable, in the order
shown.
4.4.2.1 Connectors. The six mating connector assemblies (for crimp contact terminations) or eight mating connector assemblies
(for nonremovable contacts), shall be divided equally into three groups (for crimp terminations) or four groups (for nonremovable
contacts) of two units each for groups I, II, III, and V (group V is for solder terminations only) tests of table IX. Any two additional
mating connector assemblies shall be designated as group IV sample units of table IX.
4.4.2.2 Nonremovable contacts. The sample shall be divided equally into two groups of 20 units each for groups I and II of table
IX and subjected to the inspection for their particular group. For salt spray test, 10 sets of contacts shall be unwired and unmated
and 10 sets shall be mounted as shown on figure 4.
4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval.
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