Piper Comanche PA-24 Service Manual page 96

PIPER COMANCHE SERVICE MANUAL
2-71. Purging Oxygen System. The system should be purged whenever the cylinder pressure falls below_
psi or if any lines are left open for any length of time Also. whenever there are any offensive odors present..
will be necessary to purge the system Use the following procedure
a Park the airplane in a NO SMOKING area
b. Keep all doors and windows open
c Be sure all electrical systems are shut off
d. Connect the oxygen recharging unit to the fi\ler valve
e Plug the oxygen masks into the outlet valves and turn on the system
f. 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. replace the cylinder
2-72. Cleaning of Face Masks. The disposable masks are designed for one-time use and require no
maintenance The pilofs and copilot·s masks can be cleaned as follows
a. Remove the microphone from the mask
b Remove the sponge rubber discs from the mask turrnets. Do not use soap to clean sponge rubber
discs. as this would deteriorae the rubber and give off unpleasant odors. Clean in clear water and squee7e dry
c Wash the rest of the mask with a very mild solution of soap and water
d. Rinse the mask thoroughly to remove all traces of soap
e . Make sure the sides 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
TABLE II-V TROUBLESHOOTING CHART (OXYGEN SYSTEM)
Trouble Cause Remedy
-.
No indication of pressure Cylinder empty or leak in
Charge system and check
on pressure gauge. system has exhausted for leaks.
pressure
Pressure gauge defective. Replace pressure gauge
Pressure indication normal Oxygen CYlinder regulator Replace regulator assembly
but no oxygen nowing assembly defective
Offensi,e odors in Cylinder pressure below Purge the oxygen
oxygen 50 psi Foreign mailer system Refer to Para-
has entered the system graph 2-71
during previous servicing
ADDED: 4/3/78
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HANDLING AND SERVICI.