S 865-104
(4) If the oxygen cylinders are not installed, disconnect the low pressure lines at the flow control units and cap off the lines.
NOTE: Lack of pressure at the high pressure side of the flow
____ control units during this test may cause the seal to unseat within the flow control units which can cause leakage (backflow) through the units.
S 865-105
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(5) If all the oxygen cylinders are installed, to make sure that the high pressure lines to the flow control units are pressurized, open and close the shutoff valve on each oxygen cylinder.
NOTE: The shutoff valve can be opened and closed by hand which
____ is equivalent to 25 pound-inches.
S 035-106
(6) Disconnect this electrical connector to the continuous flow control unit (AMM 35-21-04/401):
(a) DM101 electrical connector from the M101 electropneumatic unit.
S 485-107
(7) Slowly remove the cap from the test port at the low pressure line to the upper deck, located downstream of the flow control unit.
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(8) S 485-108Connect the tee fitting to the test port.
(9) S 485-109Connect one the test hose with one end to tee fitting and the other end to the 0-30 psi pressure gauge.
S 485-110
(10) Connect the other hose with one end to the tee fitting and the other end to the portable oxygen cylinder.
S 865-111
WARNING: OPEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER SLOWLY.
_______ HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(11) Open the shutoff valve on the portable test cylinder slowly, and pressurize the system to 15 psig.
NOTE: If the system pressure goes above 16 psig, the oxygen box
____ doors may open.
S 865-112
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(12)
Close the shutoff valve on the portable test cylinder once the system has become stable.
S 795-113
(13)
Make sure the pressure decrease does not go above 3 psig over a 10-minute period on the 0-30 psi pressure gauge.
(14)
Do a check for leaks if the pressure goes above the permitted limit:
S 795-114
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WARNING:_______ OPEN THE SHUTOFF VALVES ON THE PORTABLE TEST CYLINDER
SLOWLY. HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN
IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO
PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(a) Open the shutoff valve on the portable test cylinder slowly, and pressurize the system to 15 psig.
NOTE: If the system pressure goes above 16 psig, the
____ oxygen box doors may open.
(b)
Do a check of all the connections for leaks with the leak detection compound.
(c)
Rub the leak detection compound off with a clean cotton cloth immediately after the check.
(d)
Stop the leaks and do a test again until the system is satisfactory.
S 865-115
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(15) Close the shutoff valve on the portable test cylinder.
NOTE: The shutoff valve can be closed by hand which is
____ equivalent to 25 pound-inches.
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