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MIL-E-52649B
device-shall permit changing of the fuel container by an operator wearing
arctic-mittens.
Control shall be by mechanical or electro-mechanical linkage.
The metering device shall be double acting.  The primary action shall open the
container valve to allow the fuel and propellant gas to flow into an isolated
chamber in the volume specified by the applicable size.  The secondary action
of the metering valve shall allow the container valve to close to prevent
continued flow, and at the same time, the chamber outlet valve shall open,
allowing the accumulated gas to propel the charge of primer fuel through
flexible copper or nylon tubing to the atomizer.
3.5.1 Size 3.  Size 3 primer shall deliver 2-1/2 0.5 cc of primer fuel at
the atomizer during one operating cycle.
3.5.2 Size 4.  Size 4 primer shall deliver 4 O.5 cc of primer fuel at the
atomizer during one operating cycle.
3.5.3 Size 5.  Size 5 primer shall deliver 5 O.5 cc of primer fuel at the
atomizer during one operating cycle.
3.5.4 Size 6.  Size 6 primer shall deliver 6 O.5 cc of primer fuel at the
atomizer during one operating cycle.
3.5.5 Size 12.  Size 12 primer shall deliver 12 1.O cc of primer fuel at
the atomizer during one operating cycle.
3.6 Type V. gas prop ellant fully automatic priming eq uipment.  Type V
primer equipment shall utilize an 18-ounce or 21-ounce cylinder, conforming to
MS39254, charged with engine primer fuel with propellant as specified in
O-F-1044, type III.  The primer equipment shall be attached to the primer fuel
container by screw threads conforming to FED-STD-H28 and a rubber gasket
conforming to ASTM D 2000, class M3BG614C12E034F19 shall be provided for a
leak-free connection.  The primer equipment mounting shall fix and support the
fuel container vertically and shall prohibit movement horizontally. The mount
shall hold either size container by a friction, over-center type, or
screw-type clamping device.  The clamping device shall permit changing of the
fuel container by an operator wearing arctic mittens. The primer equipment
engine temperature sensor switch shall determine when the system shall
function.  When needed, the solenoid valve shall be activated automatically
during engine cranking, then primer fuel shall be released from the
pressurized  cylinder, flows through the valve, through the metering orifice at
full cylinder pressure, through the flexible copper or nylon tubing, and out
of an injector nozzle located in the engine's air intake system.  The valve
shall have a reservoir that maintains flow of primer fuel after cranking to
prevent the just-started engine from faltering or dying. The primer equipment
shall deliver not more than 0.25-cc of primer fuel per 100 cubic inches of
engine displacement per second.  The primer fuel flow shall be continuous
throughout the cranking operation.

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