Piper COMANCHE PA-24-180 Service Manual page 66

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.l
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 filler 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 pilot's 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 squeeze 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 Il-V TROUBLESHOOTING CHART (OXYGEN SYSTEM)
PIPER COMANCHE SERVICE MANUAL
Trouble
Cause
Remedy
No indication of pressure
on pressure gauge.
Cylinder empty or leak in
system has exhausted
pressure
Charge system and check
for leaks.
Pressure gauge defective.
Replace pressure gauge
Pressure indication normal
but no oxygen flowing
Offensive odors in
oxygen
Oxygen cylinder regulator
assembly defective
Cylinder pressure below
50 psi Foreign matter
has entered the system
during previous servicing
Replace regulator assembly
Purge the oxygen
system Refer to Para-
graph 2-71
ADDED: 4/3/78
iCi
1C 18
HANDLING AND SERVICING