Cleaning And Purging Of Oxygen System Components - Piper ARROW III Service Manual

CHEROKEE ARROW III SERVICE MANUAL
When the six inch requirement cannot be complied with, one inch is
allowed as long as the electric 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 supported clamp, as shown in
Figure 14-18, 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 14-18, 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 clearances. Refer to Figure 14-18, Sketch B.
10. Perform any other required maintenance as directed in AC 43.13-1A.
11. Clean components as necessary per the following subject-paragraph.

14-58. CLEANING AND PURGING OF OXYGEN SYSTEM COMPONENTS.

Care and critical attention must be exercised to prevent contamination of
oxygen system components by oil, grease, water, or foreign matter.
Compressed air used in cleaning or flushing tubes must be clean, dry,
filtered (oil free) air only.
Solvents can be reused provided they do not become badly contaminated
with oil. This condition can be determined by thoroughly evaporating 100
milliliters of the liquid in a glass dish of a determined weight. Evaporation
may be accomplished by heating the dish at 200 degrees F° for one-half
h o u r. If after evaporation and cool down, the residue exceeded 100
milligrams in weight, the solvent cannot be used for this purpose.
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.
Revised: 2/13/89
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