MIL-DTL-81581/6B
3.5 Performance. The performance of the hose assemblies shall be in accordance with the
general specification and with the added performance requirements specified herein.
3.5.1 Group IA and IB hose assemblies (Drawing 281AS100).
3.5.1.1 Flow verification (hose assemblies with Drawings 289AS100 or 290AS100 quick
disconnect). The hose assembly shall permit oxygen flow through the proof assembly prior to
engagement of the electrical pins when engaging the disconnect of the hose assembly when
tested as specified in 4.3.1.1. Oxygen shall continue to flow through the proof assembly until
after disengagement of the electrical pins when the disconnect of the hose assembly is
disengaged.
3.5.1.2 Leakage. The hose assembly shall not exhibit a leakage rate greater than 1.00 cubic
centimeter per minute per foot when tested as specified in 4.3.1.2.
3.5.1.3 Flow check (hose assemblies with Drawing 289AS100 quick disconnect). The hose
assembly shall show no indication of leakage during the initial 3-minute period after the
applicable pressure has been attained when tested as specified in 4.3.1.3.
3.5.1.4 Pressure drop. The pressure drop through the hose assembly shall be not greater
than 5 psi when tested as specified in 4.3.1.4.
3.5.1.5 Quick disconnect endurance. The hose assembly shall not exhibit any distortion,
difficulty in engagement or disengagement, or any other change that will affect performance
when tested as specified in 4.3.1.5.
3.5.2 Group II hose assemblies (Drawing 281AS100).
3.5.2.1 Flow check. The hose assembly shall show no indication of leakage when tested as
specified in 4.3.2.1
3.5.2.2 Leakage. The hose assembly shall show no additional indication of leakage above
that specified in the applicable specification sheet when tested as specified in 4.3.2.2.
3.5.2.3 Pressure drop.
3.5.2.3.1 Hose assembly (Drawing 286AS100). The pressure drop across the complete
hose assemblies minus the tare value, shall be not greater than 4.5 inches of water when tested as
specified in 4.3.2.3.1
3.5.2.4. Connector endurance. The hose assembly shall not exhibit any distortion or any
other change that will affect its performance when tested as specified in 4.3.2.4.
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