Installation Of Pressure Gauge; Inspection And Overhaul Time Limits - Piper PA-31-350 Maintenance Manual

PIPER AIRCRAFT
T-1020
MAINTENANCE MANUAL
INSTALLATION OF PRESSURE GAUGE.
1. Place the gauge into the panel from the front and replace the clamp and retainer nut on the back
of the gauge. Be sure the gauge is positioned properly before tightening the clamp.
2. Reconnect the connector at the rear of the gauge.
3. Reconnect the charging valve line to the regulator.
INSPECTION AND OVERHAUL TIME LIMITS.
It is recommended that inspection and overhaul be conducted by an FAA Approved Station or the
manufacturer, Scott Aviation. The following checks give recommended inspection and overhaul time
for the various parts of the oxygen system.
1. The oxygen cylinder can be identified by the ICC or DOT identification stamped on the cylinder.
The standard weight cylinder (ICC or DOT 3AA 1800) must be hydrostatic tested every 5 years. The light-
weight cylinder (ICC or DOT 3HT 1850) must be hydrostatic tested every 3 years and must be retired from
service after 15 years or 4380 pressurizations, whichever occurs first. The month and year of the last test is
stamped on the cylinder beneath the ICC identification.
2. The outlets should be checked for leakage both in the non-use condition, and for leakage around
an inserted connector.
3. The high pressure gauge may be checked for accuracy by comparing its indicated pressure with
that of a gauge of known accuracy.
4. Inspection of the regulator may be effected by introducing into an outlet a mask connector to
which is attached a 100 psi gauge. With one other outlet flowing through a plugged in mask, the indicated
regulator output pressure shall be not less than 45 psig at sea level with 200 psig supply cylinder pressure. It
should be noted that the permissible leakage through the 1/6 diamater vent hole in the side of the upper
regulator housing is 10 cc/min. maximum, when the regulator is turned on. There shall be no external
leakage anywhere on the regulator when it is turned off. All fittings shall be leak free.
CHARGING THE OXYGEN CYLINDER. (Refer to Chapter 12 for charging instructions.)
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35-16-00
Page 35-10
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Revised: February 23, 1982
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