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|  MIL-T-62032H
4.3.10 Fluid flow tests. Test fluid shall be a clean commercial solvent with viscosity
equal to gasoline or turbine fuel, but having a higher flash point and lower vapor pressure.
4.3.10.1 Bottom loading system and calibration test. Using either leg of the bottom
loading adapter, at the manufacturer's option, the tank of the first production vehicle shall be
loaded from empty at a rate of not less than 600 gpm through a calibrated meter. Failure of the
tank to accept 600 gpm, failure of the tank compartment to accept less than its required capacity
before closing of the bottom loading valve, acceptance by the tank compartment of more than its
required capacity (in excess of 1 percent) or liquid contact with or liquid flow from the vents
shall constitute failure of the test. The capacity marker of 3.5.10 shall be checked against the
meter reading for proper setting. Upon any failure, corrections shall be made and the entire test
repeated until successful.
*
4.3.10.2 Fuel servicing tests. The tank of the first production truck shall be completely
discharged through the onboard meter and fuel servicing system(s) (gravity discharge for
type V). The recorded flow out through the onboard meter shall be compared to the amount of
fluid pumped into the truck to insure proper calibration of the onboard meter. During discharge,
the flow rate (except on type V) shall be rapidly varied from 0 to 100 gpm for overwing refueling
and closed-circuit fuel servicing and from 0 to 200 gpm for underwing fuel servicing. On
type III and IV trucks, the nozzle pressure shall be observed and the time from no-flow to
full-flow measured for conformance to 3.8.4.2.(b). For type I and III vehicles with the optional
75 gpm automatic nozzle (see 3.6.1.2), the automatic nozzle shall be replaced with a 100 gpm
nozzle for the purpose of these tests.
4.3.10.3 Self-load test. To determine conformance to 3.6.4.1, the four 10-foot lengths of
hose shall be connected from the suction stub of the first production truck to a storage tank or
other typical fuel source below ground level. A flow rate of not less than 100 gpm shall be
maintained for a minimum of 3 minutes.
4.3.10.4 Defuel tests. The first production truck of type III and IV shall be tested to
simulate defueling through the overwing and the underwing nozzles. The rate of flow during
defueling shall be measured for conformance to 3.8.4.1(b), 3.8.4.1(c) and 3.8.4.2(b). The tank
shall be filled to capacity during defueling to check automatic closing of the bottom loading
valve during defueling.
4.3.10.5 Recirculation test. The recirculation system shall be tested for conformance
to 3.8.4.5.
4.3.10.6 Deadman control. The deadman control shall be tested to insure immediate fuel
flow stoppage when the control is released.
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