MIL-DTL-28837C
4.6.2 Periodic inspection. Periodic inspection shall consist of group B. Except where the results of these
inspections show noncompliance (see 4.6.2.2) with the applicable requirements, delivery of products which have
passed group A shall not be delayed pending the results of these periodic inspections. Frequency of periodic
inspection is defined by qualifying activity to be every 24 months, consistent with period of qualification validation.
4.6.2.1 Group B inspection. Group B inspection shall consist of the inspections specified in table V, in the order
shown. Group B inspection shall be made on sample units selected from inspection lots which have passed the
group A inspection (see 4.6.2.2). Group B inspection may cover a family of structurally similar mixer stages built on
the same header in accordance with MIL-H-28719.
TABLE V. Group B inspection.
Inspection
Requirement
Test method
paragraph
paragraph
Subgroup I (2 sample units)
Thermal shock ---------------------------------------------------------
Vibration ---------------------------------------------------------------
Shock --------------------------------------------------------------------
Seal-----------------------------------------------------------------------
Barometric pressure 1/----------------------------------------------
Electrical characteristics 2/ --------------------------------------
Subgroup 2 (2 sample units)
Solderability 2/ --------------------------------------------------------
4.7.10
Resistance to solvent 2/ --------------------------------------------
Resistance to soldering heat 2/-----------------------------------
Temperature extreme ------------------------------------------------
Terminal strength 2/ -------------------------------------------------
4.7.14
Moisture resistance---------------------------------------------------
4.7.15
Salt atmosphere 1/ --------------------------------------------------
Electrical characteristics 2/ --------------------------------------
1/ When specified (see 3.1).
2/ As applicable (see 3.1).
4.6.2.2 Noncompliance. If a sample fails to pass group B inspection, the manufacturer must notify the qualifying
activity and the cognizant inspection activity of such failure and 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 materials and processes, and which are considered subject to the same failure. Acceptance
and shipment of the product must be discontinued until corrective action, acceptable to the qualifying activity has
been taken. After the corrective action has been taken, group B inspection must be repeated on additional sample
units (all inspection, or the inspection which the original sample failed, at the option of the qualifying activity). Group A
inspection may be reinstituted; however, final acceptance and shipment must be withheld until the Group B inspection
has shown that the corrective action was successful. In the event of failure after reinspection, information concerning
the failure must be furnished to the cognizant inspection activity and the qualifying activity.
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