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MIL-E-52649B
3.7 Type III safety accessories.  When specified (see 6.2), thermal
controls to protect an engine against ether injection after warmup, and
cranking controls to protect against hydraulic block by excessive ether
injection prior to cranking shall be furnished.
3.7.1 Temperature control.  When a thermal control is specified, either of
the following types may be furnished.
3.7.1.1 Engine coolant temperature control.  The temperature control
device shall receive thermal energy from the cooling system. The device shall
prevent the flow of ether when the coolant temperature rises above 100 F.
Upon cooling, the device shall open to allow ether flow at 50F or below
engine coolant temperature.
3.7.1.2 Engine manifold temperature control.  The temperature control
device shall receive thermal energy from the exhaust manifold. The device
shall prevent the flow of ether when the exhaust manifold temperature rises
above 140 `F.  Upon cooling, the device shall allow ether flow at 50 F or
below exhaust manifold temperature.
3.7.2 Cranking control.  The cranking control shall be a pressure-
sensitive valve.  The valve shall be normally closed, inhibiting the flow of
primer fuel between the metering equipment and the air induction system. The
valve shall open at an oil pressure of 5 pounds per square inch (psi) and
above, and will close when oil pressure falls below 3 psi.  The control design
shall be such that primer fuel can only be injected into the manifold when oil
pressure due to cranking reaches 5 psi and above. The pressure sensor shall
have 1/8-inch pipe threads in accordance with FED-STD-H28.
3.7.3 Temperature and pressure control combination.  When applicable,
safety controls may be furnished separately or in combination.  For
combination use, utilizing the pressure-sensitive valve (see 3.7.2), the
thermal valve (see 3.7.1) shall be placed in the primer line between the
metering device and the oil-pressure sensor plug.  This combination will
inhibit injection of primer fuel when the oil pressure of the engine is below
3 psi, and when the block temperature of the engine rises above 50F.
3.8 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. -
3.9 Treatment and Painting.  Unless otherwise specified (see 6.2), the
painting of the primer equipment shall be the supplier's standard. When
specified (see 6.2), painting shall be in accordance with MIL-T-704, type F or
G as applicable, topcoat color as specified.
3.10 Identification markings.  Identification markings shall be in
accordance with MIL-STD-130, method optional, and shall include as a minimum
the following:
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