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WAVEGUIDE PRESSURIZATION SYSTEM
SYSTEM OPERATION - 14020_34

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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waveguide pressure during an overpressure condition. Air Desiccators The waveguide pressurization system contains two air desiccators. The desiccators remove moisture from the regulated air. The desiccators contain desiccant to absorb moisture and a silica gel for an indicating agent. During normal operation, the silica gel is blue. When moisture saturation occurs, the gel turns pink. The color change is visible through an inspection window on the housing of the desiccator. Ground Test Ports The waveguide pressurization system contains two test ports, one for electronic countermeasures and one for the radar waveguide. The two test ports provide a method of using a ground air source to pressure test the system. MISSILE LIQUID COOLING UTILITY SYSTEM 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. 1-23







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