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MIL-V-85830(AS)
4.8 Inspection methods.
4.8,1 Visual examination.
4.8.1.1 Ventilator.  Every ventilator shall be examined visually for
critical defects to determine conformance to this specification.  In addition,
every ventilator, selected as a sample unit from the lot, shall be visually
examined for minor defects to determine conformance to this specification.
The classification of defects (see Table IV), shall be used to classify the
defects found.
4.8. 1,1.1 Dimensions.  Each ventilator, selected as a sample unit from the
lot, shall be checked dimensionally to determine conformance to the dimensions
herein.
4.8.1.2 Packaging.  Each of the fully prepared shipping containers,
containing ventilators, selected as a sample unit from the lot, shall be
examined to determine that the packaging, packing and marking conform to this
specification.  The list of defects (see Table V), shall be used to enumerate
the defects found,
4.8.2 Performance
4.8.2.1 Leakage.
4.8.2, 1.1 Suction.  The filter canister(s) shall be removed and the
canister ports blocked off using canister blanks.  A suction of three in. WG,
shall be applied to the outlet of the delivery hose and leakage shall be
measured for a period of one minute.  The leakage shall be as specified in
3.9.1.1.
4.8.2. 1.2 Pressure.  The filter canister(s) shall be removed and the
canister ports blocked off using canister blanks.  A positive pressure of five
in. WG. shall be applied to the outlet of the delivery hose and measured for a
period of one minute.  The leakage shall be as specified in 3.9.1.2.
4.8.2.2 Pressure drop.  The pressure drop through each filter canister
port shall be measured at a flow of 150 lpm. and shall be as specified in
3.9.2.
---
Back pressure.  With the filter canister blanks replaced with
4.8.2.3.
filter canisters and with an air flow of 100 lpm. applied to the outlet of the
air supply hose, the back pressure of the system shall be measured and shall
be as specified in 3.9.3.
4.8.2.4 Insulation resistance.  With the motor switch in the `OFF'
position the resistance between the battery connector terminals shall be
measured with a 250 volt d.c insulation tester as specified in 3.9.4.
4.8.2.5 Pressure and flow.
4.8.2.5.1 External power on ground. The ventilator shall be connected to
an external power supply of 28.0 volts d.c.  With the motor switch in the `ON'
position, the pressure at the outlet of the delivery hose shall be recorded at
an air flows of O, 25, 50, 75, 100, and 125 1pm. and shall be as specified in
3.9.5.1.

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