Piper COMANCHE PA-24-180 Service Manual page 60

2-51. Draining Fuel System. Drain the fuel from the system by opening the drain valve at the bottom of th
fuel strainer bowl. or removing the bowl.
2-52. Electrical System.
2-53. Servicing Electrical System. Servicing the electrical system involves adding distilled water to the
battery to maintain correct electrolyte level. checking cable connections and checking for any spilled
electrolyte that would lead to corrosion. The security of all electrical connections should be checked as well
as the operation of all lights. general condition of generator or alternator and starter All electrical wires
should be inspected for chafing and bare wires. For detailed information on this system. refer to Section IX
of this manual
2-54. Oxygen System.
2-55 Description of Oxygen System. The oxygen system for the PA-24 consists of an oxygen cylinder and
regulator, filler valve. pressure gauge, outlets and masks and an ON / OFF control mounted on the instrument
panel. The stationary cylinder is located aft of the baggage area on the left side of the fuselage The cylinder
used is an ICC or DOT 3AA 1800 classification with a 63 cubic foot capacity at a working pressure of 1800
psi. High pressure oxygen is routed from the cylinder and regulator to the pressure gauge mounted in the upper
portion of the aft cabin bulkhead. Low pressure oxygen is routed from the cylinder and regulator to the outlets
and masks whenever the control knob is pulled to the ON position. Each outlet has a spring loaded valve
which prevents the flow of oxygen until a mask hose is engaged into the outlet.
2-56 Troubleshooting. Troubles peculiar to the oxygen system are listed in Table II-V along with probable
causes and suggested remedies
2-57. Oxygen System Safety Precautions. The utmost care must be exercised in servicing. handling and
inspection of the oxygen system. Comply with the following precautions:
a
Keep all oxygen system components free from oil, grease. gasoline and all other readily combustible
substances.
b
Do not allow foreign matter to enter the oxygen lines.
WARNING
The presence of foreign matter in the high pressure lines can cause an
explosion. When coming in contact with oxygen equipment keep
hands. tools and clothing clean - hospital clean.
c
Never attempt to repair or repaint oxygen equipment.
d
Keep fire and heat away from oxygen equipment. Do not smoke while working with or near oxygen
equipment, and take care not to generate sparks with carelessly handled tools when working on the oxygen
system.
e.
Never allow electrical equipment to come in contact with the oxygen cylinder.
PIPER COMANCHE SERVICE MANUAL
f.
direction
lines.
Use Ribbon Dope Thread Sealant (Permacel 412) on male ends of fittings only. Wrap thread in
of thread spiral. beginning with the second thread on the fitting. Avoid getting any sealant into the
HANDLING AND SERVICIN
REVISED: 11/1/82
1C12