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Table 8-1.—Specifications On Supply Cylinders | Up
Aircrew Survival Equipmentman 2 - Aviation theories and other practices | Next
MAINTENANCE FOR THE C-O-TWO TRANSFER UNIT |
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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