MIL-DTL-26499E
4.7.7 Tensile strength test (see 3.5.5). The hose assembly shall be subjected to tensile strength test
and shall meet the requirements of 3.5.5. The following details shall apply:
a. Attached by the end connections to the heads of a tensile testing machine and pulled at the rate of
approximately 1 inch (25.40 mm) per minute up to 1,000 pounds (453.59 kg) pull.
b. Any failure below 1,000 pounds (453.59 kg) shall be cause for rejection of the lot.
4.7.8 Burst pressure test (see 3.5.6). The hose assembly shall be tested for burst pressure and shall
meet the requirements of 3.5.6. The following details shall apply:
a. Hydraulically pressurized from 0 to 9,600 psig in approximately 2 minutes.
b. If any component of the hose assembly bursts or the assembly cracks at any junction, the lot shall
be rejected.
4.7.9 Cleaning effectiveness (see 3.6). Cleaning effectiveness testing shall be in accordance with SAE
AS611 (quality assurance provisions). If a hose assembly fails any part of the quality assurance
inspections the entire lot shall be rejected. If the lot is rejected, the hose assemblies shall be recleaned in
accordance with 3.6 and a new sample taken for compliance with this test. If the test shows the cleaning
methods to be satisfactory, the hose assemblies, if required, shall be re-cleaned in accordance with the
quality assurance provisions of SAE AS611 and preserved in accordance with 3.6.3.
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.)
6.1 Intended use. The hose assemblies covered by this specification are intended for use as flexible
manifold connections on ground servicing equipment supplying breathing oxygen to aerospace
equipment. The use is military unique in its intended application the hose assembly will be used in
charging aerospace vehicle breathing oxygen systems and must be able to operate satisfactory with a
nominal working pressure of 2,400 psig (165.47 bar) in the operating temperature range from -65°F to
+160°F (-53.89°C to +71.11°C).
6.1.1 Oxygen system cleanliness needs. This specification specifies cleanliness in accordance with
SAE AS611, class II. Users are cautioned that the hose assembly should be evaluated to their
cleanliness requirements before installing in any equipment. Only qualified technical personnel with
knowledge for the selection of cleaning methods for oxygen rich environments should make the
determination as to what cleanliness level is acceptable for their application.
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