S 013-107
(4)
Get access to the passenger oxygen cylinder rack.
S 033-108
(5)
Remove the upper and lower access panels.
S 913-109
CAUTION:_______DO NOT APPLY TOO MUCH TORQUE. IF YOU APPLY TOO MUCH TORQUE, DAMAGE TO THE VALVES CAN OCCUR.
(6) Close the shutoff valves for all passenger oxygen cylinders with your hand.
S 913-110
WARNING: YOU MUST LET THE PRESSURE IN THE LINE BLEED OUT BEFORE YOU
_______ DISCONNECT THE CYLINDER. THE PRESSURE CAN BE AS MUCH AS 1850 PSI. INJURY CAN OCCUR IF YOU DO NOT LET THE PRESSURE BLEED OUT.
(7)
Slowly loosen the fill line connector at the oxygen cylinder neck to bleed the pressure.
(8)
Loosen the connector on the other end of the short fill line.
S 033-111
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S 033-112
(9) Fully disconnect the fill line from the cylinder and the fill feeder line.
NOTE: Keep the line to install the replacement cylinder.
____
S 033-113
(10)
Disconnect the overboard discharge line (B-nut) from the oxygen cylinder neck.
S 033-114
(11)
Disconnect the other end of the short portion of the overboard discharge line.
S 033-115
(12)
Remove the line and retain to install the replacement cylinder.
S 013-137
(13)
Remove the T-bolt nut, turn the forward retaining ring in the forward direction.
S 023-138
(14)
Pull the oxygen cylinder forward and remove it.
NOTE: The weight of an oxygen cylinder is usually 35 to 43 pounds
____
(15.9-19.5 kilograms).
S 913-139
WARNING:_______YOU MUST PUT CAPS ON THE OPENINGS. MAKE SURE THE CAPS YOU USE ARE CLEAN. YOU MUST USE METAL CAPS WHEN THERE ARE CONNECTOR THREADS TO ENGAGE WITH THREADS IN THE CAP. AFTER YOU USE THEM, YOU MUST DISCARD OR CLEAN THE CAPS. REFER TO THE OVERHAUL MANUAL FOR THE PROCEDURES TO CLEAN THE OXYGEN SYSTEM COMPONENTS.
(15) Install caps on the oxygen cylinder port and on all the line openings to keep the system clean.
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CAUTION:_______YOU MUST TIGHTEN THE CAP TO THE CORRECT TORQUE. IF YOU DO NOT CORRECTLY TIGHTEN THE CAP, THE CYLINDER PRESSURE CAN DECREASE.
(16) For the cylinders with a metal valve-seat in the shutoff valve, install and tighten the cap to 350-400 pound-inches (39.54-45.19 newton meters) on the inlet/outlet line.
NOTE: The cap is found when you remove a cylinder with the metal
____ valve-seat in the shutoff valve. The cap is held by a chain to the valve.
G. Procedure - Install the Passenger Oxygen Cylinder
S 913-116
WARNING: OBEY THE PASSENGER OXYGEN SYSTEM - MAINTENANCE PRACTICES.
_______ IF YOU DO NOT OBEY THE CORRECT PROCEDURES, A FIRE OR AN EXPLOSION CAN EASILY OCCUR. A FIRE OR AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.
(1)
Read and obey the Maintenance Practices procedures for the passenger oxygen system (AMM 35-11-00/201).
S 863-117
(2)
Make sure the airplane is grounded correctly (AMM 20-41-01).
S 283-118
(3)
Make sure it has not been more than three years since the
replacement oxygen cylinder had its last hydrostatic test.
NOTE: The last hydrostatic test date will be on a label near the
____ top of the oxygen cylinder or on the neck of the cylinder.
S 913-120
WARNING: YOU MUST REMOVE THE CAP SLOWLY AND LET THE PRESSURE BLEED OUT.
_______ THERE CAN BE HIGH PRESSURES IN A PRESSURE-TYPE CAP. THE CAP CAN BLOW OFF WITH MUCH FORCE IF YOU REMOVE IT QUICKLY. INJURY TO PERSONS CAN OCCUR IF THE CAP BLOWS OFF.
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