Removal And Installation Of Pressure Gauge; Removal And Installation Of Outlets; Purging Oxygen System; Cleaning Of Face Masks - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
14-18. REMOVAL OF PRESSURE GAUGE. Ascertain that the control valve is closed and there is no
pressure in the system.
a. Disconnect the connector from the back of the pressure gauge.
b. Loosen and remove the retainer nut and clamp holding the gauge in place.
c. Pull the gauge out from the front of the panel.
14-19. INSTALLATION OF PRESSURE GAUGE.
a. Place the gauge into the panel from the front and replace the clamp and retainer nut on the back
of the gauge. Be sure the gauge is positioned properly before tightening the clamp.
b. Reconnect the connector at the rear of the gauge.
14-20. REMOVAL OF OUTLETS.
a. Using a suitable spanner wrench, remove the outer half of the outlet.
b. Remove the screws holding the trim panel and remove the panel.
c. The outlet can now be removed from the low pressure line.
14-21. INSTALLATION OF OUTLETS.
a.
Apply sealant (Permacel 412) to the male end of the fitting.
b.
Connect the outlet to the low pressure line.
c. Position the trim panel and secure with screws.
d. Position the outer half outlet and secure with a suitable spanner wrench.
e. Torque the fittings into the outlets approximately 30 inch-pounds. Do not over torque as this
could damage the outlet.
14-22. 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:
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.
14-23. 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 turrents. 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 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.
14-24. CHARGING THE OXYGEN CYLINDER. (Refer to Section II for charging instructions.)
Reissued: 9/23/80 ACCESSORIES AND UTILITIES
4E13