MIL-DTL-27272C
4.3.2.2 Over-tightening torque test for periodic. The over-tightening torque test shall consist of the test
specified in table V. This test shall be performed on two fittings at least once per year regardless of the
total number of fittings produced. The only exception is when there has been no production during the
past year, then this test is not to be performed. The fittings may be of any bend angle and joint
configuration. The two fittings selected shall be as representative as possible of the metals used for the
threaded parts if the parts have been produced from more than one type of metal (examples: aluminum
threads, steel threads) and the joint configurations shall be as representative as possible such as (one
piece, brazed joint, welded joint, mechanical joints, etc.).
4.3.2.3 Nonconformance. If a fitting fails to pass either periodic test, the manufacturer shall
immediately notify the qualifying activity and cognizant inspection activity of such failure and take
corrective action of the materials or processes, or both, as warranted, and on all units of product that can
be corrected and that were manufactured under essentially the same conditions, with essentially the
same materials and processes and that were considered subject to the same failure. Acceptance and
shipment of the product shall be discontinued until corrective action acceptable to the qualifying activity
has been taken. After that corrective action has been taken, the periodic test shall be repeated on
additional fittings (all inspections, or the inspection that the original sample failed, at the option of the
qualifying activity). Periodic tests may be re-instituted; however, final acceptance shall be withheld until
the periodic tests have shown that the corrective action was successful. In the event of failure after
inspection, information concerning the failure and corrective action taken shall be furnished to the
cognizant inspection activity and the qualifying activity.
4.3.2.4 Acceptance of conformance inspection data. For identical requirements and test procedures,
using an identical fitting, conformance inspection data from MIL-DTL-27267 or MIL-DTL-27272 shall be
accepted as conformance inspection data for MIL-DTL-25579, providing that documented approval has
been obtained from the qualifying activity. When conformance inspection data from MIL-DTL-27267 is to
be accepted as conformance inspection data for MIL-DTL-25579, two feet of bulk hose shall be
considered to be the equivalent of one hose assembly.
4.4 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of
sufficient accuracy, quality, and quantity to permit performance of the required inspection shall be used.
The establishment and maintenance of a calibration system to control the accuracy of the measuring and
test equipment shall be in accordance with ANSI/NCSL Z540-1 or equivalent.
4.5 Inspection conditions. All inspections shall be conducted in accordance with the test conditions
specified herein. Room temperature shall be 60 to 90°F.
4.5.1 Hose assemblies for fitting inspections. The hose assemblies used for fitting inspections shall be
assembled using hose conforming to MIL-DTL-27267 of the applicable size and become MIL-DTL-25579
hose assembly. An assembly shall include a nominal length of hose conforming to MIL-DTL-27267 with
one fitting installed at each end. The lengths shall be as specified in table II.
4.6 Test methods.
4.6.1 Examination of product. Fittings and their related records shall be visually examined to
determine conformance to this specification and the applicable specification sheet with respect to
materials, finish, dimensions, interfaces (mateability and hose compatibility), identification marking, and
workmanship (see 3.3, 3.4, 3.5, 3.7, and 3.8).
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