MIL-DTL-26521L
3.6.3 Hose assembly static dissipation test. Electrical resistance of the hose assembly shall not
3.6.4 Adhesion. Minimum force required to separate adjacent layers of the hose shall be not less
than 17 lb/in (8 kg/24.5mm) width when pulled at 2 in/min (51mm/min). After bore aging the hose with
JP-4 in accordance with MIL-DTL-5624, JP-8 in accordance with MIL-DTL-83133 or commercial jet A and
A1 fuel for 168 ±2 hours at 72°F ±2° F (22.2°C ±1.1°C), the minimum force required to separate adjacent
layers shall be not less than 10 lb/in (5.5 kg/25.4 mm) width at 2 in/min (51 mm/min) pull rate. The test
shall be conducted in accordance with 4.6.3.8.
3.6.5 Low temperature flexibility. The hose shall be flexible at temperatures ranging down to -40°F
±2°F (-40°C ±1.1°C) and shall not break, crack, or have layer separation when tested in accordance with
3.6.6 Working pressure. The hose assembly working pressure shall be as specified in table II when
tested in accordance with 4.6.3.3.
3.6.7 Proof pressure. The hose assembly shall not leak, when tested in accordance with 4.6.3.4,
shall not change in length more than 7% or show any imperfections when subjected to proof pressure
specified in table II.
3.6.8 Burst resistance. The hose assembly shall not blow out the coupling, burst, or develop a blister
at or below the burst pressure as specified in table II. The test shall be in accordance with 4.6.3.5.
3.6.9 Age limit. The bulk hose that is covered by this specification shall not exceed the age limits as
specified in SAE-AS1933.
3.6.10 Collapsibility. Hose having ID of 2 inches (51 mm) shall coil to a diameter of 27 ±2 inches
(686 ±51 mm) and hoses having ID of 2.5 and 3 inches (64 and 76 mm) shall coil to a diameter of 30 ± 2
inches (762 ± 51 mm) when tested in accordance with 4.6.3.9. Four inch ID hoses shall coil to 32 ± 2
inches (813 ± 51 mm). Test length shall be 50 ft ±6 inches (15240 ± 152 mm).
3.6.11 Durability. There shall be no evidence of leakage, pull off of fittings or other malfunctioning of
the hose assemblies when tested in accordance with 4.6.3.10. After being cut the hose shall be
examined, if the hose has tube separation or the inner tube has cracks, cuts or pits, it shall be cause for
rejection.
3.6.12 Hose assembly cyclic surge. Hose assemblies when cyclic surge tested shall not have any
leakage or visible coupling movement, not more than .03 inches (0.76 mm), when tested as specified in
3.6.13 Coupler pressure cycling endurance test. A hose assembly when tested as specified in
4.6.3.12 assembly when no cuts exceeding .03 inch (0.75 mm) in depth or failure of the hose lining have
occurred.
3.7 Hose identification requirements. Each hose shall be legibly marked along the longitudinal axis
consisting of the following:
PIN
Manufacturer's Commercial and Government Entity (CAGE) code
Hose Cure Date (MMDDYYYY)
Contract Number
7
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