Purging Oxygen System; Cleaning Of Face Masks; Oxygen System Troubleshooting - Piper PA-24 Comanche Service Manual

PIPER
COM:\~CH[
SERVICE
~ANt'Al
2-71. Purging Oxygen System. The system should be purged whenever the cylinder pressure falls hell1\\.
psi or if any lines are left open for any length of time. Also. whenever there are any offensiv e odors present. .
will be necessary to purge the system. l.'se the folio.... ing procedure:
a. Park the airplane in a
'0
SMOKI,G area.
b. Keep all doors and windows open.
c. Be
-ure
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. II
any odor is ...till present. repeat the procedure for one or more hours. If the odor persists after the -econd
purging. replace the cylinder.
1-72.
Cleaning of Face
~asks.
The di ..posable 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 deter iorae the rubber and gi\ e off unpleasant odors. Clean in clear water and squeeze drv.
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
eth~1
alcohol.
TABLE II-\". TROl'BLESHOOT"G CHART
(OXYGE'
SYSTE~1)
Trouble Cause Remedy
•
'0
indication of pre-sure Cylinder empty or leak in Charge system and check
on pressure gauge. ..ystem has exhausted for leaks .
pressure.
Pressure gauge defective. Replace pressure gauge.
Pressure indication normal
Oxygen cylinder regulator Replace regulator assernbly
hut no
oxygen
flowing, assembly defective.
Ottcn-iv
I.'
odors in Cylinder pressure below Purge the oxygen
ox~
gen.
50 psi, Foreign matter
system. Refer to Pa ra-
has entered the
svstern
graph 2
6 7 1 .
during previous servicing,
ADDED: 4/3/78
leIS
HA!"DLI~GA~D
SER\"ICI.