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Table 8-1.Specifications On Supply Cylinders
MAINTENANCE FOR THE C-O-TWO TRANSFER UNIT

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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Figure 8-3.—CO2 recharging schematic. Now that you have inspected the CO2 cylinder, you are ready to recharge the bottle. Figure 8-3 shows a recharging setup. Notice in the figure that you need scales, a recharge pump, a supply cylinder, and the necessary lines and valves. Proceed as follows: 1. Place the CO2 cylinder on the scales. NOTE: An accurate scale with a capacity of 100 pounds is necessary. The scale should have 1/100 pound graduations. 2. Weigh and record tare weight (empty weight of cylinder, valve and cable assembly) of the inflation assembly. 3. Install proper charging adapter on the inflation assembly. 4. Secure the inflation assembly to the weighing pan located on the scales before applying any pressure to the cylinder being recharged. 5. Open the supply cylinder valve, fill line valve, and relief valve. This is done to purge (get the air out of) the complete line. Once the line is purged, close the fill line valve and the relief valve. You must be careful when purging the line; you are dealing with a high pressure. If you do not secure the fill line before you apply pressure, the line may start a whipping action and damage anything or anyone that it hits. 6. After purging the line, connect the fill line to the inflation assembly. Ensure that the line is free from contact with any objects along the entire distance from the compressor to the charging Table 8-2.—Carbon Dioxide Charge 239.359 adapter. If the line does not hang free, accurate weight reading cannot be obtained. At this time, you must zero your scales. By zeroing the scales, you will be able to recharge the exact amount of CO2 into the inflation assembly. See table 8-2 for carbon dioxide charges. 7. Ensure that the inflation assembly valve is open. If it is closed, you cannot recharge the assembly. 8. Open the fill line valve slowly until you hear C O2 flowing through the line and into the inflation assembly, and the scale’s indicator shows the recharging cylinder is gaining weight. 9. Allow carbon dioxide to cascade (flow freely) from the supply cylinder until the scales 8-4







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