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Pressure Control Valve
Oxygen Regulators

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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Quick-Disconnect Couplings Liquid oxygen systems are designed for the rapid removal of the LOX converter for ease of servicing and maintenance. This is accomplished by the use of supply and vent quick-disconnect couplings, a single point converter retainer wing nut hold down, and quick-disconnect quantity indicator lead disconnects (fig. 4-9). The vent and supply quick-disconnect couplings are of two-piece construction. The male half is mounted on the LOX converter, and the female half is attached to the flexible oxygen supply and vent lines. The coupling for the supply line contains a spring-loaded check valve, which closes auto- matically when the supply line is uncoupled from the converter. This prevents contaminating the air- craft oxygen system when the converter is removed for servicing. The vent coupling has no check valve; however, it forms a positive seal between the vent port of the converter and over- board vent line. Heat Exchanger The lungs would be damaged if gaseous oxygen were breathed at the temperature at which it exits the LOX converter. The purpose of the air-to-oxygen heat exchanger is to increase the temperature of the gaseous oxygen after it leaves the LOX converter. The heat exchanger is located in the cockpit area of the aircraft in order to Figure 4-9.—LOX converter installation. expose it to a temperature capable of warming the gaseous oxygen regardless of the altitude of the aircraft. The heat exchanger is constructed of aluminum and has a large interior surface area (fig. 4-10). Low-Pressure Switch The low-pressure switch is located in the oxygen system supply line (fig. 4-7). It indicates to the flight crew, through a caution light in the aircraft cabin, when system pressure falls below minimum operating pressure of the system. This alerts and allows the pilot to descend to a safe altitude. Quantity Indicating System The quantity indicating system consists of a quantity gauge and a warning light. These are located in the cockpit of the aircraft. A quantity probe is also a part of the liquid oxygen converter. This probe senses the amount (quantity) of liquid contained in the converter. This informa- tion is transmitted to the quantity gauge by an Figure 4-10.—Aircraft air-to-oxygen heat exchanger. 4-15







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