MIL-DTL-8789F
4.9.7 Low temperature flexibility test. Hose assemblies when subjected to low temperature flexibility
testing shall meet the requirements of 3.6.6. The following details shall apply:
a.
Two samples of the lengths specified in table II.
b.
Both hose assemblies shall be assembled with fittings as specified herein.
c.
One sample shall be unaged, while the other shall be oil aged prior to testing.
d.
Samples shall be filled with fluid in accordance with MIL-PRF-5606, MIL-PRF-83282, or
MIL-PRF-87257 and then exposed for 24 hours in a chamber at a temperature of -65 ±2°F
(-53.9°C +1.11°C).
e. Size 16 hose may be exposed to a temperature of -40° ±2°F (-40°C ±1.11°C).
f. After the 24 hour exposure and while still at the specified temperature, the samples shall be
flexed through 180° at each extreme travel (see figure 2), considered as one cycle, to the
applicable inside bend radius specified in table II.
g. Each sample shall be subjected to one cycle only, the duration of which shall be no greater
than four seconds.
h. After the flexing cycle (see figure 2), samples shall be removed from the cold chamber and
subjected to the proof pressure test (see 4.9.3).
FIGURE 2. Flexibility test set up.
4.9.8 Over-tightening torque test. Flared and flareless type fitting when subjected to over-tightening
type fittings shall be installed on mating adapter ends (SAE-AS4395 or SAE-AS33514).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of material is to be performed by DoD or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Service or Defense Agency, or within the Military Service's System
Commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
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