14-78. MAINTENANCE.
a.
Check the cylinder to be sure it is securely mounted.
b. Check the cylinder for the ICC identification number and for the date of the last FAA inspection
and test.
c.
If cylinder is completely empty, it must be completely disassembled and inspected in an FAA or
manufacturer approved facility before recharging.
d. Refer to FAA Manual AC 43.13-1A for more details.
14-79. REMOVAL OF OUTLETS.
a.
Make sure the control valve is in the full off position.
b. Connect a mask or connector to the valve to release any pressure.
c.
Using a suitable spanner wrench, remove the outlet.
d. The outlet can now be removed from the low pressure fitting.
14-80. INSTALLATION OF OUTLETS.
a.
Apply sealant (Permacel 412) to the male end of the fitting.
b. Install the outlet to the regulator extension with a suitable spanner wrench.
c.
Torque the fittings into the outlets approximately 30 inch-pounds. Do not overtorque as this could
damage the outlet.
14-81. PURGING OXYGEN SYSTEM. The system should be purged whenever the cylinder pressure falls
below 50 psi or if any lines are left open for any length of time. Also, if the bottle is left at below 200 psi, it
may develop odors from bacterial growth. This will make it necessary to purge the system. Use the following
procedures:
CAUTION
When performing this operation, make sure the area is a NO SMOKING
AREA and is as clean as possible of oil and dirt.
a.
Keep all doors and windows open.
b. Connect the oxygen recharging unit to the filler valve.
c.
Plug the oxygen masks into the outlet valves and turn on the system.
d. Set the recharging unit pressure regulator to deliver 50 psi and let the system purge for one hour. If
any odor is still present, repeat the procedure for one or more hours. If the odor persists after the
second purging, send unit to its manufacturer or an approved shop.
14-82. CLEANING OF FACE MASKS. The disposable masks are designed for one-time use and require no
maintenance. The pilot’s and copilot’s mask can be cleaned as follows:
a.
Remove the microphone from the mask.
b. Remove the sponge rubber disc from the mask turrets. Do not use soap to clean sponge rubber
discs as this would deteriorate the rubber and give off unpleasant odors. Clean in clear water and
squeeze dry.
c.
Wash the rest of the mask with a very mild solution of soap and water.
d. Rinse the mask thoroughly to removal all traces of soap.
e.
Make sure the side of the breathing bag do not stick together while drying as this may decrease the
life of the rubber in the bag. The mask can be sterilized with a solution of 70 percent ethyl alcohol.
Revised: 2/13/89
3C16
CHEROKEE ARROW III SERVICE MANUAL
ACCESSORIES AND UTILITIES
Summary of Contents for ARROW III
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