MIL-DTL-52649C
3.5.7 Type V gas propellant fully automatic priming equipment. Type V primer equipment shall
be as follows:
a.
Utilize an 18-ounce (.51 kg) or 21-ounce (.60 kg) cylinder, in
accordance with MS39254, charged with engine primer fuel with
propellant as specified in O-F-1044, type III.
b.
The primer equipment shall be attached to the primer container by
screw threads in accordance with FED-STD-H28 and a rubber gasket
conforming to ASTM D2000 class M3BG614C12EO34F19, shall be
provided for a leak-free connection.
c.
The primer equipment mounting shall fix and support the fuel
container vertically and shall prohibit movement horizontally. The
mount shall hold the container by friction, over-center type, or screw-
type clamping device.
d.
The clamping device shall permit changing of the fuel container by an
operator wearing arctic-mittens.
e.
The primer equipment engine temperature sensor switch shall
determine when the system shall function.
f.
When needed, the solenoid valve shall be activated automatically
during engine cranking, then the primer fuel shall be released
from the pressurized cylinder, flows through the valve, through the
metering orifice at full cylinder pressure, through flexible copper or nylon
tubing and, out of an injector nozzle located in the engine's air intake
system.
g.
The valve shall have a reservoir that maintains flow of primer fuel
after cranking to prevent the just-started engine from faltering or
dying.
h.
The primer equipment shall deliver not more than 0.25-cc of primer
fuel per 100 cubic inches of engine displacement per second.
i.
The primer fuel flow shall be continuous throughout the cranking
operation.
3.5.7.1 Type V safety accessory. The type V primer equipment shall be with a factory-preset
interlock engine temperature sensor which shall prevent the primer equipment from supplying primer fuel
to a warm engine.
3.6 Performance.
3.6.1 Diethyl ether stability. When tested in accordance with 4.7.2, non-metallic material shall not
swell, harden or soften rendering the non-metallic parts unfit for the endurance test (see 4.7.3).
3.6.2 Endurance. When tested in accordance with 4.7.3, the plastics, rubbers, and fibers utilized in
the fabrication of primer equipment shall remain functional.
3.6.3 Thermal stability and discharge volume. When tested in accordance with 4.7.4 the primer
equipment shall operate to discharge a repeatable volume of fuel within 0.5 cc of the specified volume,
without leakage, in temperatures ranging from -65 to +100 °F for 1,000 cycles.
3.6.4 Valve actuation. The solenoid-actuated valve shall activate when voltage is applied to it.
3.6.5 Leakage. No leakage shall be observed coming from the primer after the activation of
the valve.
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