Piper SARATOGA PA-32-301 Maintenance Manual page 377

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
3. Inspect tank for dents, bulges, corrosion, and major strap chaffing marks. Should any of these
problems exist, the tank should be removed and hydrostatically tested.
4. An operational check of the regulator can be accomplished as follows; (Refer to Figure 35-2.)
A. Interconnect a sensitive pressure gauge of a range of 0 to 100 psi, with a Scott Aviation 8570-00
plug-in, and connect the apparatus to the pilots outlet in the overhead panel. It is recommended that a hose of
1/4 in. I.D. x 1/2 in. O.D. and 18 inches long be used.
B. Interconnect a pneumatic flow apparatus of a range of 0-5 liters per min. (LPM), with a Scott
Aviation 8570-00 plug-in. Use the same hose dimensions as explained in the last step. Connect the flow
apparatus to the co-pilot's outlet.
C. Insert a Scott plug-in in each of the other outlets and pull the oxygen control knob to the on
position. The pressure and flow should be 55 to 80 psi and 3.3 to 5.3 (LPM) respectively, at sea level.
D. There should be no external leakage anywhere on the regulator when it is turned off, and all
fittings leak free.
5. Check airframe log book for last maintenance on oxygen system and perform as required per Chart
3502.
6. Test the oxygen for odor. Pure oxygen is odorless and tasteless. Any system having a significant odor
present in the gas should be purged and the bottle replaced or, removed and purged.
7. Any fittings, connectors, and tubes which have imperfect threads, pitted or disfigured cones, or other
damage should be replaced.
- CA UTION -
Oxygen tubes must not be clamped to, or supported by electrical
wire bundles, hydraulic, pneumatic or other lines.
8. Check plumbing for kinking, cracks, gouges, dents, deep scratches, or other damage; and, replace as
necessary.
9. Make sure to check the oxygen lines for proper clearance as follows; (Refer to Figure 35-3.)
A. Two inch minimum between oxygen tubes and all flexible moving parts of the aircraft (flexible
control cables, etc.). If enough space cannot be attained, protection from abrasion must be provided.
B. At least 1/2 inch minimum between oxygen tubes and all rigid moving parts of the aircraft such
as levers and rigid control rods.
C. Six inch minimum separation between oxygen tubes and hydraulic, fuel and electrical system
lines and components.
(1) When the six inch requirement cannot be complied with, one inch is allowed as long as
electrical cables and other lines are supported at least every two inches; and. the oxygen
tube(s) is protected by rubber neoprene hose fastened in place with cable ties at the location
the specific item crosses or is near the oxygen tube(s). If an item is near the oxygen tube for a
certain distance the oxygen tube for that distance must be covered.
D. A minimum of 1/8 inch between tubing and structure adjoining the supporting clamp as shown
in Figure 35-3, Sketch A.
E. Where a tube passes through a grommet, the tube must not bear on the grommet in any way that
might cause cutting of the grommet in service as shown in Figure 35-3, Sketch D.
F. While in service, items may receive vibrations causing them to come in contact with other parts
of the aircraft. With this in mind, low pressure tubing that is supported well enough to prevent relative motion
must have at least a minimum clearance of 1/8 inch from a projector (bolt, nut, etc.). Low pressure tubing that
cannot be supported well enough to prevent motion must have a minimum clearance of 1/ 8 inch allowed after
the maximum travel of the tube. High pressure lines are affected similarly but require 1/2 inch minimum
clearances. Refer to Figure 35-3, Sketch B.
10. Perform any other required maintenance as directed in AC43.13-1A, Chapter 8,
11. Clean components as necessary per the following subject-paragraph.
35-10-02
Page 35-05
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Added: May 21, 1980
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