MIL-DTL-8788F
4.5.6.5 Change to manufacturing process, materials or equipment. The manufacturer shall notify the
qualifying activity, in writing, of any changes in the manufacturing process, materials, or equipment used
to manufacture a QPL product. Subsequently, the qualifying activity will notify the manufacturer, in
writing, if a full re-qualification, partial re-qualification, or no additional testing is required as a result of
these changes.
4.5.6.6 No production during reporting period (12 months). When no production occurs during the
reporting period, a report shall be submitted to the qualifying activity certifying that the manufacturer still
has the capability and facilities necessary to produce the QPL product.
4.5.6.6.1 Discontinuation and resumption of production of bulk hose (three years or more). If there
has been no production of any size hose for a period of three years or more, six (6) samples of any size
hose at the option of manufacturer shall be subjected to sampling and periodic inspections. Two hoses shall
be subjected to sampling inspection and four hoses shall be subjected to the periodic inspection (see
table V).
4.6 Test conditions.
4.6.1 Preparation of specimens. Test samples shall be assembled with samples of fittings of
applicable size conforming to MIL-DTL-8789. Assembly lengths shall be as shown in table I.
4.6.2 Temperature. Unless otherwise specified, room temperature shall be defined as +60°F to +90°F
(15.56°C to 32.22°C).
4.6.3 Test fluids. Unless otherwise specified, the test fluid shall be hydraulic fluid conforming to
MIL-PRF-5606, MIL-PRF-87257, MIL-PRF-83282, or water.
4.6.4 Aging of samples. When specified, specimens shall be either air aged (see 4.6.4.1) or oil aged
(see 4.6.4.2) prior to testing.
4.6.4.1 Air aging. Samples shall be exposed to air at a temperature of +158°F ±2°F (70 ±0.16°C) for
a minimum of 168 continuous hours.
4.6.4.2 Oil aging. Samples shall be completely immersed in fluid in accordance with MIL-PRF-5606,
MIL-PRF-87257, or MIL-PRF-83282 at a temperature of +158°F ±2°F (70° ±0.16°C) for a minimum of 168
continuous hours. The following details shall apply:
a. Air shall not be trapped in the bore of the tube during this aging period.
b. The volume of fluid used shall be sufficient to completely fill and cover the samples.
c. Both the samples and the fluid shall be placed in a non-pressurized closed type container or in
a reflux type condenser to prevent distillation of the volatile matter in the fluid.
d. For qualification tests, a new batch of oil shall be used for each group of test samples.
e. For quality conformance tests, a new batch of oil shall be used for each 10 or fewer tests.
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