Oxygen System Leak Tests; Mask - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

(4) Leak Tests
Leak-Tec Formula #16-OX is the solution recommended for leak testing and is available from
Scott Aviation.
NOTE: Whenever a leak check is performed, all fitting connections as well as other
questionable areas, should be inspected.
(a) The following can be tested with the cylinder drawer assembly removed from the aircraft
and the cylinder fully charged: (all are high pressure)
1
2
3
(b) The low pressure hose and its connection to the mask / stowage box assembly can be
checked in two ways:
1
2
(c) Procedure:
1
2
3
4
5
6
7

(5) Mask

(a) Complete System Test
At least once a year perform the following test.
1
2
3
35-10-00
PAGE 10
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
cylinder to regulator connection
capillary line to regulator connection
capillary line to pressure gauge
by pressurizing the hose to 100 PSI with dry nitrogen from a gauged regulated
source, or
by setting the pilot's oxygen valve to ON when the cylinder is fully charged and the
cylinder drawer assembly is installed in the airplane.
As described in (a) or (b), above, ensure the component/connection to be tested is
pressurized.
Apply the leak detector solution to the test surface and watch for indication of
leakage.
Large leaks will produce bubbles immediately, but small leaks will form a white foam
in 5 to 60 seconds.
If leaks are evident, remove pressure, correct any leaks and retest.
When no leaks are evident, wipe off excess leak detector solution.
If a low pressure hose test, close the valve on the nitrogen gas tank or the pilot's
oxygen valve and use the mask "Press to Test and Reset" and mask regulator "Press
to Test" control knob to vent line to ambient. Disconnect the gauged regulated
nitrogen source, if used.
If the oxygen cylinder is not to be hooked up or installed immediately, cap and cover
the exposed fittings with new clean plastic bags. Make sure caps and coverings are
as clean as possible.
Remove the mask from the stowage box by firmly grasping the red tabs and pulling.
Depress the inflation control valve (red tab) with thumb and forefinger and hold to
inflate the harness.
NOTE: Make sure the blinker on the stowage box turns yellow and then black, within
a few seconds. This indicates harness is leak-tight when inflated.
Position the mask onto the head and release the inflation control valve to deflate the
harness.
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