Piper Arrow IV Turbo Maintenance Manual page 453

9. Make sure to check the oxygen lines for proper clearance as follows: (Refer to Figure 35-4.)
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 35-4, 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 35-4, 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 projection (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 35-4, Sketch B.
10. Perform any other required maintenance as directed in AC 43.13-1A, Chapter 8.
11. Clean components as necessary per the following subject-paragraph.
CLEANING AND PURGING OF OXYGEN SYSTEM COMPONENTS.
Care and critical attention must be made to prevent
contamination of components by oil, grease, water, or foreign
matter. Compressed air used in cleaning and flushing tubes must
be clean, dry, filtered (oil free) air only.
Three methods are recommended for cleaning oxygen system components as follows:
1. Method I.
A. Vapor degrease affected part(s) with trichlorethylene.
B. Blow part(s) dry with a stream of compressed air, or dry nitrogen. Refer to previous caution.
2. Method II.
A. For tubing, flush with naptha per specifications TT-N-95.
B. Blow clean and dry off all solvent with clean, dry, filtered air. Refer to previous caution.
C. Flush with isopropyl alcohol.
D. Rinse thoroughly with fresh water.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—CAUTION—
2H6
35-10-03
Page 35-08
Added: November 6, 1979