MIL-DTL-25427B
4.2 Inspection lot. A lot shall consist of all parts of a given part number made from the
same material, same manufacturing processes, manufactured during the same period of
production, and presented for inspection at essentially the same time.
4.2.1 Sampling for inspection. Sample from each lot of couplings for inspection shall be
randomly selected per ANSI/ASQ Z1.4, 1% AQL, Level II and shall pass the qualification
inspections specified in table V.
4.3 Maintaining record of inspection. The contractor shall maintain a record of
inspections performed on each lot and shall be available to the acquiring activity upon request.
4.4 Inspection conditions.
4.4.1 Temperatures. Unless otherwise specified, the inspection shall be conducted at
room temperature 70 °F to 90 °F and a fluid temperature of 70 °F to 110 °F measured within 12
inches of the test sample. The actual temperature of the fluid during the inspection shall be
recorded.
4.4.2 Test fluid. Hydraulic fluids used in all tests shall conform to MIL-PRF-5606,
MIL-PRF-83282, or MIL-PRF-87257.
4.5 Qualification inspection. Qualification inspection shall consist of all examinations
and tests specified in table V. Qualification tests shall be performed at a laboratory acceptable to
the Government. The test samples shall be products produced with consistent equipment and
procedures used in production. The test methods are described in 4.8.
4.5.1 Test samples. Test samples submitted for qualification shall be as specified by the
qualifying activity. When the tests are conducted at a location other than the government testing
facilities, the contractor shall get approval from the qualifying activity prior to testing.
4.6 Conformance inspection. Conformance inspection shall be conducted as specified in
table VI and test methods are described in 4.8. Results of this inspection shall be submitted to
the qualifying activity.
4.6.1 Inspection of product for delivery. Products for delivery shall be inspected to
ensure they pass the conformance inspection specified in table VI. Marking shall be in
accordance with 3.8.
4.6.2 Periodic inspection. If there is no production for 3 years, periodic inspection shall
be performed and shall consist of those tests listed in table VII. Where the results of these
inspections show noncompliance with the applicable requirements (see 4.6.3), delivery of
products which have previously passed the qualification inspection requirements shall be
withheld pending corrective action taken to the satisfaction of the qualifying activity. Periodic
inspection samples shall be representative of products which are qualified and listed on the
qualified product list.
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