MIL-PRF-83772C
d. Test documentation requirements (see 4.3).
e. Required level of preservation and packaging, and packing (see 5.1).
f. Reporting requirements (see 6.6).
g. Hose marking requirements (see 6.7, 6.8).
6.3 Definitions. For the purpose of this specification, the following definitions will
apply.
6.3.1 Hose assembly. The ten foot hose including the male and female end fittings
attached at either end.
6.3.2 Servicing pressure. The pressure of the cryogenic liquid (45 ±5 psi) which will be
transmitted through the hose assembly to the aircraft requiring liquid nitrogen or oxygen.
6.3.3 Purging. The process of flowing liquid nitrogen or oxygen fluid through the hose
assembly which was previously empty. Gaseous vapor of the cryogenic fluid is usually seen first,
and purging is complete when the hose assembly has cold soaked sufficiently such that liquid
cryogenic fluid begins to flow out the end of the hose assembly.
6.3.4 Servicing cycle. A servicing cycle is defined as transferring cryogenic liquid under
pressure from one vessel to another.
6.3.5 Hose filler valve. A valve which attaches to the end of the hose, is cylindrical with
an OD of 2.25 inches, a length of 7 inches and a weight of approximately 2 lb 11oz. The USAF
part number is 20C-0021-2.
6.3.6 Aircraft filler valve. The aircraft filler valve is a valve to which the hose filler
valve connects in order to transfer cryogenic liquid. It is 2.375 inches long and weighs
approximately 9oz. The USAF part umber is 20C-0003-6.
6.4 Liquid or gaseous oxygen and nitrogen. MIL-PRF-27210 provides the
characteristics and requirements for type I (gaseous) and type II (liquid) oxygen when used for
aviator's breathing purposes. Commercial Item Descriptions (CIDs) A-A-59503 and A-A-59155
prescribes the characteristics and requirements for type I (gaseous) and type II (liquid) nitrogen.
6.5 Hose assembly. In the past, a metal braid was used to surround and protect the inner
hose.
6.6 Test Report. In the past, a test report was written based upon the results of
preproduction testing within 20 days after the completion of the tests. The test report was
submitted to the procuring activity. MIL-HDBK-831 was used as guidance for writing the report.
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