MIL-PRF-6081D
4.2.3 Requalification. Requalification shall be required when any change is made in source of manufacture, purity,
or composition of the lubricating oil base stocks or additives. A minor change in the oil formulation may be made
without requalification testing, but only after notification to, and approval by, the qualifying activity (see 6.3). Each
reformulation request shall include a certified test report (see 4.2.2).
4.3 Conformance inspection. Conformance inspection of production lots shall consist of all the tests specified in
table II. Failure of production lots to pass any of the conformance tests shall be cause for rejection of the lot.
4.3.1 Sampling. Each bulk lot (see 6.7) of material shall be sampled at random in accordance with ASTM D4057 or
ASTM D4177 for the conformance inspection tests (see 4.3).
4.3.2 Inspection. Inspections shall be conducted in accordance with FED-STD-791, method 9601, "Inspection
Requirements"
4.3.2.1 Examination of filled containers. A random sample of filled containers from each lot (see 6.7), taken in
accordance with ASQC-Z1.4, shall be examined for conformance to MIL-STD-290 with regard to fill, closure,
sealing, leakage, packaging, packing, and markings. Reject any container having one or more defects or for being
under the required fill. If the number of defective or underfilled containers exceeds the acceptance number for the
appropriate sampling plan of ASQC-Z1.4, reject the lot represented by the sample.
4.3.3 Conformance inspection test report. A copy of the conformance inspection report on each lot of oil produced
for US Government use shall be forwarded to the Propulsion Directorate, AFRL/PRSL, Bldg 490, 1790 Loop Road
North, Wright-Patterson AFB OH 45433-7103.
4.4 Test methods. All tests shall be performed in accordance with tables I and II.
4.4.1 Reported data. Test results of all determinations shall be included in reporting data.
TABLE II: Conformance tests.
Test
Test Method
Characteristic
Paragraph
ASTM
Copper strip corrosion (see table I)
--
D130
Viscosity stability at -54ºC (-65ºF)
--
D2532
and 40ºC (-40ºF), %1/
Acid number, mg KOH/g
--
D974
(see table I)
Viscosity (see table I), cSt
--
D445
at 37.8 °C (100 °F)
D445
at -40 °C (-40 °F)
D2532
at 54 °C (-65 °F)
Flash point ºC (ºF). (see table I)
--
D92
Pour point ºC (ºF). (see table I)
--
D97
ASTM color (see table I)
--
D1500
Trace sediment in lubricating oils
--
D2273
(see table I)
Viscosity measurements taken at the specified temperature after three hours at test temperature, 121ºC (250ºF).
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