Removal Of Oxygen Unit; Inspection And Overhaul Times; Oxygen System Component Limits; Testing For Leaks - Piper ARROW III Service Manual

CHEROKEE ARROW III SERVICE MANUAL

14-75. REMOVAL OF OXYGEN UNIT.

Do not use grease or any grease type fittings on any hardware that connects
to the oxygen bottle or system hardware. When working with the system
make sure hands, clothing, and tools are free of oil, grease, and dirt when
working with the oxygen system.
The oxygen unit can be released from its cradle by pulling down on the ring under the cradle, and sliding
the unit forward, and lifting it out of the cradle.
14-76. INSPECTION AND OVERHAUL TIMES. Due to the nature of the process used to test compressed
gas tanks, it is recommended that overhaul, service or hydrostatic tests be conducted by a DOT, FAA, or
manufacturer (Scott Aviation) approved shop. The following checks and charts give recommended inspection
and maintenance information for the various parts of the oxygen system.
Oxygen cylinders are identified by the ICC or DOT identification stamped
on the cylinder. The standard weight cylinder (ICC or DOT 3AA 1800) must
be hydrostatic tested at the end of each 5 year period. Lightweight cylinders
(ICC or DOT 3HT 1850) must be tested every 3 years and after 4380 refills
or 24 years whichever comes first, be replaced. The month and year of the
last test is stamped on the cylinder beneath the ICC, DOT identification.
1. Inspect outlets, and using directions described in the next paragraph, check leaks both in the non-use
and use condition.
2. Check the pressure gauge for accuracy by removing the back section of the unit and connecting a
gauge of known accuracy to the fill port.
3. Inspect tank for dents, bulges, major strap chaffing marks, or corrosion. Should any of these conditions
exist, the tank should be hydrostatically tested.
PARTS
Regulator
Pressure Gauge
Outlets
Recharge Valve
Masks
14-77. TESTING FOR LEAKS. Apply detector fluid Leak Tec Formula #16-OX (American Gas and Chemical
Co.) solution or its equivalent. The solution should be shaken to obtain suds or foam. The suds or foam should
be applied sparingly to the joints of the system. Look for traces of bubbles. Visible leakages are not permitted.
Repair or replace any defective parts and retest system. With the system pressurized to service pressure, further
tests can be made. All traces of the detector fluid should be wiped off at the conclusion of the examination.
Revised: 2/13/89
WARNING
WARNING
TABLE XIV-VI. OXYGEN SYSTEM COMPONENT LIMITS
INSPECTION
300 Flight Hrs.
300 Flight Hrs.
300 Flight Hrs.
Each Use
Each Use
ACCESSORIES AND UTILITIES
3C15
OVERHAUL
5 Years
5 Years
5 Years
Replace Every 5 Yrs.
Replace as Necessary