Piper Navajo PA-31 Service Manual page 982

PIPER NAVAJO SERVICE MANUAL
14-12. REMOVAL OF FILLER VALVE.
a. Remove the floor panel from the left side at the rear of the baggage compartment or access panel
from the right side of the aft fuselage just aft of the passenger compartment. Be sure valve is closed on the
cylinder.
b. Disconnect the tee fitting from the filTer valve.
c. Remove the three nuts and bolts holding the filler valve in place and remove the valve through
the access door on the outside of the fuselage, below the valve.
14-13. INSTALLATION OF FILLER VALVE.
a. Place the valve into position through the access door and replace the three bolts and nuts.
b.
Tighten the three bolts and reconnect the tee fitting.
c.
Replace the floor panel or access panel.
14-14. 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 the remove the retainer nut and clamp holding the gauge in place.
c. Pull the gauge out from the front of the panel.
14-15. 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.
14-16. 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.
14-17. 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.
14-18. 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, whenever there are any offensive
odors present it will be necessary to purge the system. Use the following procedure:
a.
Park the airplane on 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.
Reissued: 10/12/79
ACCESSORIES AND UTILITIES
5E9