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SYSTEM OPERATION - 14020_146
Gaseous Oxygen System Troubleshooting

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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through tubing to an overboard discharge indicator. In the event of excessive pressure developing within the low-pressure section of the pressure reducer, the excess pressure will flow through the relief valve and out the overboard discharge line. This flow will rupture the green disc in the discharge indicator, giving a visual indication of a malfunctioning pressure reducer. A line from the high-pressure side of the pressure reducer connects to a gauge in the cockpit. This gauge gives the pilot an indication of pressure in the three storage cylinders. The oxygen flows from the low-pressure side of the reducer to the three regulators. A flexible hose attached to each regulator is for attachment of the oxygen mask. Portable Oxygen Systems Portable oxygen systems include walkaround cylinders, survival kits, and bailout units. These systems are used primarily to maintain crew functions in the event of failure of the fixed oxygen systems. The survival kit oxygen system also performs the same function during descent after bailout. All of these are small, lightweight, high-pressure, self-contained gaseous systems, which are readily removed from the aircraft. Walkaround Cylinders Walkaround cylinders are standard equipment on many transport, patrol, and early warning aircraft, and are used separately or in addition to a permanently installed oxygen system. Each system consists of a reducer and regulator assembly mounted directly on a small oxygen cylinder. Figure 4-6 illustrates a high-pressure walk- around oxygen system. A 295 or 514 cubic inch- capacity, 1,800 psi cylinder is equipped with a regulator, which is connected to the cylinder with a short coiled length of copper tubing. A short flexible breathing tube, clamped to the outlet of the regulator at one end and fitted with a connector at the other end, provides the necessary assembly for the attachment of the demand mask tube. Straps fastened to the cylinder bracket provide the means for securing the unit to the user’s seat or part of the aircraft’s structure. The cylinder bracket may be placed horizontally or stood on end while in use. The straps can be used as a handle to carry it from place to place. Because of its weight, the walkaround unit should not be carried by its breathing tube, regulator, or copper tubing. SYSTEM MAINTENANCE The maintenance procedures discussed in this section are general in nature. Consult the applicable MIM prior to performing any maintenance on each specific type of aircraft. Routine maintenance includes servicing of cylinders, checking the system and regulators for Figure 4-6.—Walkaround oxygen bottle cylinder. 4-9







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