If the pressure drop across the filter element
condition) advisory light to illuminate. Also, a thermal
exceeds 16 3 psi, the red differential pressure
switch will open when 230 5F is reached. This
indicator button extends to warn of a clogged filter. If
switch causes the pump to stop and also illuminates the
the pressure drop exceeds 21 to 25 psi, the relief valve
MSL COND light. The coolant pump is located in the
passes coolant around the filter element. When the filter
right Phoenix fairing.
bowl is removed, an automatic shutoff valve closes to
prevent loss of coolant.
Coolant Fluid Expansion Tank
Missile Controller
The expansion tank (fig. 5-30) is located in the right
Phoenix fairing. The tank maintains a constant coolant
The controller (fig. 5-30) is the brain of the liquid
fluid pressure at the pump inlet, accommodates thermal
cooling system. It receives electrical input from the
expansion of the coolant, and provides a coolant reserve
sensors and controls component operation. It keeps the
for the missile loop in case of leakage. The tank has a
hot and cold modulating valves from opening at the
bellows, fluid sight and level indicator, fluid relief
same time. The controller also provides electrical
valve, and a pneumatic pressure indicator. The bellows
signals to the naval flight officer (NFO) caution
is pressurized to maintain a positive fluid pressure of 30
advisory indicator.
to 70 psi at the pump inlet. Should pressurization reach
45 2.3 psi, the fluid pressure relief valve will open
and vent fluid. The fluid sight and level indicator
Coolant Temperature Sensor
displays fluid level, and the pneumatic pressure
indicator extends to indicate air pressure by tem-
Two sensors are located in the cooling loop. The
perature degrees.
sensors are isolated from the coolant by being installed
in wells that are filled with thermal grease. Both sensors
Missile Bypass Valve
are identical in construction, but each has a different
purpose in the system. One sensor is mounted in the
missile return line. The other sensor is in the missile
The missile bypass valve is used to bypass the
supply line of the missile loop. Each sensor contains
missile when the fluid pressure within the missile
two sensing elements. One performs the primary
reaches 89 +0, -5 psi. When the condition exists, the
sensing function, and the other is used for the built-in
bypass valve opens. This allows a portion of the coolant
test (BIT).
fluid to flow from the supply line to the return line
without passing through the missile.
Fairing Interlock Switch
Missile Air-Moisture-Contaminant Remover
The fairing interlock switch provides an electrical
connection for the missile coolant pump motor and
The remover (fig. 5-30) is mounted in the right
pressure switch circuits. The switch is closed when the
Phoenix fairing. It removes air, moisture, and foreign
Phoenix fairing is installed.
particles from the coolant, but it does not remove
standing water. The remover consists of a cleanable
filter element, a replaceable removal cartridge, a
Liquid Cooling Control Panel
fail-safe valve and indicator, a relief valve, and an
automatic shutoff valve. If the removal cartridge fails,
The liquid cooling control panel is located on the
the fail-safe valve prevents coolant loss by securing the
NFO's left side console. When the liquid coolant switch
air-water removal overboard port. If this occurs, a
is set to the AWG-9/AIM-54 position, it activates both
yellow indicator button is released to warn of cartridge
the radar and missile cooling loops of the system.
failure.
5-27
