Outlets; Removal Of Outlets; Installation Of Outlets; Purging Oxygen System - Piper PA-31-350 Maintenance Manual

PIPER AIRCRAFT
T-1020
MAINTENANCE MANUAL
- CAUTION -
Most air compressors are oil lubricated and a minimum amount of
oil may be carried by the air stream. A water lubricated compressor
should be used to blow tubing clean only when nitrogen is not
available. The air must be clean, dry and filtered.
1. Vapor degrease using Trichloroethylene conforming to MIL-T-27602 and blow unit clean and dry
with stream of dry nitrogen.
2. Flush thoroughly with clean, unused Freon TMC. Purge for two minutes minimum with
125
°
F. (minimum) dry nitrogen.
3. Flush clean with hot (125
°
F to 210
°
F) inhibited alkaline cleaner until free of oil and grease. Rinse
thoroughly with fresh water and purge dry with dry nitrogen.
4. Flush with Naphtha: blow unit clean and dry with dry nitrogen. Flush again using anti-icing fluid or
anhydrous ethyl alcohol. Rinse thoroughly with fresh water and purge dry with dry nitrogen.
OUTLETS.
REMOVAL OF OUTLETS.
1. Using a suitable spanner wrench, remove the outer half of the outlet.
2. Remove the screws holding the trim panel and remove the panel.
3. The outlet can now be removed from the low pressure line.
INSTALLATION OF OUTLETS.
1. Apply sealant (Permacel 412) to the male end of the fitting.
2. Connect the outlet to the low pressure line.
3. Position the trim panel and secure with screws.
4. Position the outer half outlet and secure with a suitable spanner wrench.
5. Torque the fittings into the outlets approximately 30 inch-pounds. Do not over torque as this
could damage the outlet.
PURGING OXYGEN SYSTEM.
The oxygen system is purged to remove condensed moisture and offensive odors using dry nitrogen. The
system must also be purged if system pressure falls below 50 psi. or if any lines are left open for any length
of time.
1. Close cylinder fill valve. (If cylinder is not installed, cap "T" fitting.
2. Inspect charging (nitrogen) connector for cleanness. Remove filler valve protective cover and
connect nitrogen hose to filler valve.
3. Install oxygen mask connectors into all outlet ports.
4. Turn regulator to full open (clockwise).
5. Turn on nitrogen supply to 50 psi and purge system for 15 minutes.
35-13-05
Page 35-06
Issued: September 2, 1981
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