Learning Objective: Identify operating principles and maintenance safety pre-cautions for missile liquid cooling utility systems.

The liquid cooling system in the F-14 aircraft is used with both the radar and missile systems. The cooling system heats and cools the Phoenix missile. The temperature control system consists of a weapons control system (WCS) cooling loop for the radar system and a missile cooling loop for the missile system; both loops are controlled by a common controller. In each loop, a dielectric coolant fluid is circulated by a motor-driven pump. The fluid is filtered to remove air, moisture, and foreign matter. The right Phoenix missile fairing (fig. 1-17) contains the mis-sile coolant pump assembly and the missile

Figure 1-17.- Missile fairing.

air-moisture contaminant remover. When the missile cooling loop is not required, the fairing is removed from the aircraft. The ultimate heat sink is ram air and/ or refrigeration system air for cooling; hot air from the bleed manifold 400 F temperature control system provides heating. The WCS/ missile temperature control system also uses cooling air from the ground cooling system when ground operation is required.