Outlets Intallation; Oxygen On/Off Control Removal And Installation; Oxygen System Refilling - Piper PA-44-180 SEMINOLE Maintenance Manual

INSTALLATION OF OUTLETS.
1. Apply teflon tape to male threads of the affected fitting. Refer to appropriate procedure in this chapter.
2. Connect the outlet to the low pressure line.
3. Position the trim panel and secure with screws.
4. Position and secure the outer half of the outlet with a suitable spanner wrench.
5. Torque the fittings onto the outlets to approximately 30 in. lbs. Do not overtorque.
REMOVAL AND INSTALLATION OF OXYGEN ON/OFF CONTROL. (Refer to Figure 35-1).
1. As shown in Figure 35-1, the on/off control is mounted in the overhead vent panel. To remove the control,
drop the overhead panel and ducting, and remove the retaining nut from the rear of the control cable fitting.
2. Make access to the bottle, if necessary, and disconnect the cable from the regulator-control mechanism .
3. Cut the tie wraps securing the cable and pull cable from aircraft.
4. When installing a new cable~ make sure new cable shield is cut to 84.0 inches long and that the core has
sufficient material to make a twin loop two inches from the end of the shield. Install as follows:
A. Rout cable through the hole in the overhead duct and as shown in Figure 35-1. Tie wrap the cable as
before.
B. Make sure the cable properly reaches the valve and reinstall vent and panels. Reconnect cable to
control mechanism.
REFILLING OXYGEN SYSTEM
BEFORE SERVICING THE OXYGEN SYSTEM MAKE SURE THE
AIRCRAFT IS SECURELY GROUNDED ELECTRICALLY
DO NOT ATTEMPT TO TIGHTEN ANY CONNECTIONS WHILE THE
SYSTEM IS CHARGED
DO NOT OPERATE ANY ELECTRICAL EQUIPMENT WHILE SERVICING
OXYGEN SYSTEM
PERSONNEL INVO LVED IN SERVICING OR FUNCTIONALLY TESTING
AN OXYGEN SYSTEM ARE LIKELY TO HAVE THEIR CLOTHING
P E R M E ATED WITH OXYGEN DO NOT SMOKE OR STAND NEAR AN
OPEN FLAME FOR A PERIOD OF 15 MINUTES AFTER WORK IS
COMPLETED
Refilling of oxygen systems should be done by qualified personnel. For comparison of filling pressures to
ambient temperatures refer to Chart 3503. The following are parameters to be followed for filling.
1. Only aviators breathing oxygen (MIL-0-27210) and appropriate filling equipment should be used to fill the
system.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— CAUTION —
2J23
3 5 - 11 - 1 5
Page 35-15
Revised: May 15, 1989