Missile Bypass Valve
The missile bypass valve is located at fuselage
station 372. It is used to bypass the missile when
the fluid pressure within the missile reaches
89 + 0, – 5 psid. When this condition exists, the
bypass valve opens. This allows a portion of the
coolant fluid to flow from the supply line to the
return line without passing through the missile.
Missile Air-Moisture-Contaminant
Remover
The remover is mounted in the right Phoenix
fairing. It removes air, moisture, and foreign
particles from the coolant, but it does not remove
standing water. The remover consists of a
cleanable filter element, a replaceable removal
cartridge, a fail-safe valve and indicator, a relief
valve, and an automatic shutoff valve. If the
removal cartridge fails, the fail-safe valve prevents
coolant loss by securing the air-water removal
overboard port. If this occurs, a yellow indicator
button is released to warn of cartridge failure.
If the pressure drop across the filter element
exceeds 16 ± 3 psi, the red differential pressure
indicator button extends to warn of a clogged
filter. If the pressure drop exceeds 21 to 25 psi,
the relief valve passes coolant around the filter
element. When the filter bowl is removed, an
automatic shutoff valve closes to prevent loss of
coolant.
Missile Controller
The controller is the brain of the liquid cool-
ing system. It receives electrical input from the
sensors and controls component operation. It
keeps the hot and cold air modulating valves from
opening at the same time. The controller also
provides electrical signals to the naval flight
officer (NFO) caution advisory indicator.
Coolant Temperature Sensor
Two sensors are located in the cooling loop.
The sensors are isolated from the coolant by
being installed in wells that are filled with
thermal grease. Both sensors 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
supply line of the missile loop. Each sensor
contains two sensing elements. One element
Figure 1-19.—Liquid coolant service unit.
1-26
