MIL-PRF-83867D (USAF)
4.6.4 Leakage.
The jig that is described in 4.6.2 shall be used for this test. The hose connection port shall be
blocked by using an elastometric cap. An internal pressure of 1 psi shall be applied at
temperatures of 77 ±18 °F, -65 ±2 °F, and 160 ±2 °F. The total leakage shall not exceed 0.01
LPM.
4.6.5 Pressure drop through connector.
With the valve closed, pressure or suction shall be applied to the connector to obtain a flow of
15 LPM from the regulator end to the mask end. The pressure drop through the connector shall
be 4 to 6 inches of water. The pressure tap shall be a suitable device (see 6.6) located on the
mask side if suction is used and on the regulator side if pressure is used. The flow duct shall be
constructed to ensure a straight flow for at least 6 inches immediately after leaving the
connector if suction is used or for at least 6 inches immediately before entering the connector if
pressure is used. The connector housing shall be mounted in a vertical position and its location
shall permit free flow into the connector if suction is used and free flow out of the connector if
pressure is used.
4.6.6 Pressure drop through connector with jig.
The connector shall be connected to the same jig as in 4.6.2. With the valve actuator located at
the top of the slots, pressure shall be applied to the jig to obtain flows in the range of 0 to 135
LPM from the regulator end to the mask end. The pressure drop through the assembly shall be
measured by a suitable device such as described in 6.6. Pressure drops through the assembly
shall not exceed the values specified in table I.
4.6.7 Reliability.
If required in the acquisition documents (see 6.2), the sample of connectors used for this test
shall be subjected to simulated breathing cycles at a rate of 10-20 breathing cycles per minute
at room temperature (77±18 °F). Cyclic breathing of the connectors shall be accomplished with
a peak flow rate of 30 LPM inhalation and exhalation, with the restrictor valve in the open
position. During 20% of the time that the connectors are subjected to breathing cycles, they
shall be vibrated at a frequency ranging from 500 to 2,500 cycles per minute, at a double
amplitude of not less than 0.018 inch nor more than 0.020 inch. The connector shall be vibrated
alternately in each of the 3 axes for 6 hours per axis. At least once every 24 hours of the
breathing cycles, each connector shall be subjected to and shall meet the inspections specified
in 4.6.2 (room temperature), 4.6.4, and one 20-cycle run as described in 4.6.7. No parts shall be
replaced as preventative maintenance during reliability testing. Sufficient testing shall be
conducted to demonstrate an MTBF of 600 hours at a confidence level of 0.9. At the conclusion
of this testing the connectors shall be subjected to inspection as specified in 4.3.1.
4.6.8 Longevity.
If required by the acquisition documents (see 6.2), the operating life span shall be verified by
extending the reliability test to reach 2,000 hours of operation by each connector.
4.6.9 Odor.
Gaseous oxygen shall be allowed to pass through the assembled connector at a rate not
greater than 10 LPM for 1 minute. A smell test shall be conducted in a manner that shall prevent
exterior odors from influencing the test. Using a minimum of 6 persons as testers, no more than
33% of the testers shall judge any odor as objectionable.
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