d. When the pressure gauge on the recharge unit or in the aircraft reaches 1800 to 1850 psi, close the
pressure regulator valve on the recharge unit Disconnect the filler hose from the filler valve;
replace the protective cap on the filler valve and close the access cover. Check the cylinder
pressure according to Chart VIII-IV after the cylinder temperature stabilizes.
5. After detaching the service cart, cap hose and fittings to prevent contamination.
6. Perform a leak check of the high pressure lines and clean off solution afterwards. If solution is not
properly cleaned off, unusual corrosion may result.
14-72. PORTABLE OXYGEN SYSTEM.
Figure 14-20. Portable Oxygen Installation
14-73. DESCRIPTION AND OPERATION. The portable oxygen system is available as one of two options
that provides oxygen for the PA-28R-201T and renders it capable of cruising at higher altitudes.
The portable oxygen unit consists of a 22 cu. ft. capacity cylinder contained in a carrying case that is
installed in a cradle located between the rear seats. (See figure 14-20, Portable Oxygen Installation.) The
system utilizes a dual manifold, which permits 4 masks to be used, two from each single outlet using a dual
connector.
CAUTION
Use only aviation breathing oxygen when having the oxygen bottle charged.
MIL-0-2710C specified that the moisture content of aviation breathing
oxygen must not exceed 0.005 milligrams of water vapor per liter of gas at a
temperature of 70°F and a pressure of 760 millimeters of mercury.
14-74. TROUBLESHOOTING. (Refer to Table XIV-VI.)
Revised: 2/13/89
3C14
CHEROKEE ARROW III SERVICE MANUAL
ACCESSORIES AND UTILITIES
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