MIL-DTL-27267D
4.6.2 Tube tests.
4.6.2.1 Tube roll and tube proof pressure. Each length of tubing shall be subjected to a tube roll and
a tube proof pressure test in accordance with SAE-AS2078, using a proof pressure specified for a
1500 psi hose. Conformance shall be as specified in 3.5.2.1.
4.6.2.2 Tensile strength and elongation. The tube shall be subjected to both the tensile strength and
the elongation tests in accordance with SAE-AS2078. Conformance for tensile strength shall be as
4.6.2.3 Specific gravity. The apparent specific gravity of the tube shall be determined in accordance
with ASTM D792 while the relative specific gravity of the tube shall be determined in accordance with
SAE-ARP1153. If test samples are obtained from a braided hose, the braid impressions shall be
removed prior to testing. Conformance shall be as specified in 3.5.2.4.
4.6.2.4 Tube conductivity. A 14-inch (356 mm) length of tube shall be subjected to testing in
accordance with SAE-AS2078, Electrical Conductivity test procedure under "Tests on PTFE Inner Tubes".
When test samples are obtained from a braided hose, the braiding shall be removed prior to testing.
Conformance shall be as specified in 3.5.2.5.
4.6.3 Hose and assembly tests.
4.6.3.1 Braid flare. A hose when tested for braid flare shall meet the requirements of 3.5.3.1, the
following details shall apply:
a. A length of hose, no longer than 12 inches (305 mm), shall be sized by expanding the flared-
out end over a plug.
b. The diameter of the plug shall be as specified in the "expansion diameter" column of table IV.
c. The plug shall be inserted into the flared-out end of the hose to a depth of .187 inch (4.75 mm)
and then removed.
d. After this sizing operation, the sample shall then be inserted through a ring with the bottom of
the flare extending 6 inches (152 mm) above the top of the ring.
e. The inside diameter of the ring shall be as specified in the "maximum flare diameter - ring
inside diameter" column of table IV. From this position, the sample shall be allowed to pass,
by its own weight, through the ring.
4.6.3.2 Proof pressure. A hose assembly when proof pressure tested shall meet the requirements of
3.5.3.2, the following details shall apply:
a. Prior to testing, the hose assembly shall be examined to ensure that it is properly assembled.
b. The test sample shall then be subjected to testing in accordance with SAE-AS2078 using the
applicable proof pressure specified in table III.
c Test fluid shall be water; however, fluid conforming to MIL-PRF-5606, MIL-PRF-83282, or
MIL-PRF-87257 may be used during qualification testing.
4.6.3.3 Elongation and contraction. Samples shall be subjected to elongation and contraction testing
in accordance with SAE-AS2078, shall meet the requirements of 3.5.3.3. The test fluid shall be water or
fluid conforming to MIL-PRF-5606, MIL-PRF-83282, or MIL-PRF-87257.
4.6.3.4 Impulse. Hose assemblies when subjected to impulse testing shall meet the requirements of
3.5.2.4, the following details shall apply:
a. All test specimens, of length as specified in table III, shall be subjected to the proof pressure test
(see 4.6.3.2) prior to impulse testing in accordance with SAE-AS2078.
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