MIL-DTL-26518C
TABLE IX. Group B inspection.
Class R
Class H
Inspection
Requirement
Method
sample number
paragraph
paragraph
1
2
3
4
5
6
All
X
X
X
X
X
X
X
4.7.1.1
3.1, 3.3, 3.5,
Inspection of product
3.7, and 3.8
3.6.4
X
X
X
X
X
X
X
4.7.5
Maintenance aging
3.6.6
X
X
X
X
X
X
X
4.7.7
Thermal shock
3.6.7.1
X
X
X
4.7.7.1
Dielectric withstanding voltage 1/
3.6.12
X
X
X
4.7.13
Moisture resistance
3.6.13.1
X
X
4.7.14.1
Insulation resistance
3.6.19.1
X
X
4.7.20.1
Air leakage (Class R)
3.6.19.2
X
4.7.20.2
Air leakage (class H)
3.6.21
X
X
X
X
X
4.7.22
Altitude immersion
3.6.13.2
X
X
X
4.7.14.1
Insulation resistance
3.6.3
X
X
X
X
X
X
4.7.4
X
Mating and unmating forces
3.6.7.1
X
X
X
X
4.7.7.1
X
Dielectric withstanding voltage (unmated)
1/
3.6.20
X
4.7.21
X
3.1, 3.3, 3.5,
Contact retention
X
X
X
X
X
X
4.7.1.1
X
3.7, and 3.8
Inspection of product
1/ Sea level.
4.6.2.3 Failures. If any sample units fail to pass periodic inspection, the entire lot shall be considered to have failed.
4.6.2.4 Noncompliance. If a sample fails to pass group B inspection, the contractor shall take corrective action on the materials or
processes, or both, as warranted, and on all units of product which can be corrected and which were manufactured under essentially
the same conditions, with essentially the same materials, processes, etc., and which are considered subject to the same failure.
Acceptance of the product shall be discontinued until corrective action, acceptable to the Government, has been taken. After the
corrective action has been taken, group B inspection shall be repeated on additional sample units (all inspection, or the inspection,
which the original sample failed, at the option of the Government). Groups A inspections may be reinstituted; however, final
acceptance shall be withheld until the group B reinspection has shown that the corrective action was successful. In the event of
failure after reinspection, information concerning the failure and corrective action taken shall be furnished to the cognizant inspection
activity and the qualifying activity.
4.6.2.5 Disposition of sample units. Sample units, which have been subjected to the periodic inspection, shall not be delivered on
a contract or purchase order.
4.7 Methods of inspection.
4.7.1 Test methods. The following identified tests and test methods assure connector and contact integrity within typical operating
conditions and applications. Alternate commercial industry standard test methods are allowed however when an alternate method is
used, the alternate method must be coordinated with the qualifying activity prior to performance of the test. The test methods
described herein are proven methods and shall be the referee method in cases of dispute.
4.7.1.1 Inspection of product. Connectors and associated hardware shall be examined to verify that the design, construction,
physical dimensions, marking, and workmanship are in accordance with the applicable requirements (see 3.1, 3.3, 3.5, 3.7, 3.7.1 and
3.8).
4.7.1.2 Final inspection of product. Final examination of crimp contacts shall include a thorough examination to insure that
identification markings are legible, the contact is free from mechanical defects, there are no cracks around the crimp area, and the
contacts meet the physical requirements specified herein. Examination shall be made with a device having magnification power of
approximately 3X.
4.7.2 Dry arc resistance. A minimum of 5 disk specimens of insert material conforming to designation ASTM D5948 Phenolic
mineral/glass filled, shall be tested in accordance with ASTM D495, employing the circuit shown on figure 1 with details as follows:
a.
A 12-kV (minimum) transformer.
b.
The kVA rating of the transformer not specified, but 10 milliamperes (rms) shall be obtainable.
c.
Sufficient external resistance may be added in the leg of the circuit that is not grounded if
necessary to obtain the required 10 milliamperes across the electrodes in air (not reading on
test specimen).
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