NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-11-28/401).
 S 414-039
 (7) Close the access panels to the oxygen cylinders.
 NOTE: The access panel to the oxygen cylinders installed on the
____ sidewall is attached by snaps and velcro tape. The access panels to the oxygen cylinders installed in the ceiling are attached by zippers.
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747-400 MAINTENANCE MANUAL
 PORTABLE OXYGEN EQUIPMENT - DESCRIPTION AND OPERATION
_____________________________________________________
 1.  General_______
 A.  The portable oxygen equipment consists of portable oxygen cylinder assemblies and protective breathing equipment which are installed at convenient locations (FIM 35-31-00/101). The cylinders supply a portable supply of gaseous breathing oxygen to be used for emergency, first aid or sustaining oxygen for the supernumerary passengers and/or crew. The breathing equipment supplies portable emergency respiratory and eye protection for the crew in an oxygen-deficient, smoke-laden or other toxic atmosphere.
 2.  Portable Oxygen Cylinder Assemblies (Figs. 1, 2)___________________________________
 A.  Oxygen cylinders provide 2 and 4 liters per minute (lpm) constant-flow rate outlets (Fig. 2). The oxygen cylinder assembly is comprised of a cylinder, a regulator assembly, a pressure gage, shutoff valve, servicing valve, high pressure safety plug, a relief valve, and a carrying harness. The regulator assembly produces a reduced constant-flow pressure through two outlets.
 B.  The portable cylinder (when filled to a pressure of 1800 psi) is equivalent to a capacity of 11 cubic feet of free oxygen at 760 mm of mercury and 70°F temperature. The rated service pressure at the above conditions is 1800 psi. A pressure gage on the cylinder assembly indicates the oxygen pressure inside the cylinder and, indirectly, the quantity of oxygen available. High temperature protection is provided by a frangible metal safety disc located in the regulator assembly. In case of excessive pressure, the disc fractures to vent the oxygen to the atmosphere.
 C.  Pressure regulators located on the portable oxygen cylinders reduce the high pressure of the cylinders to a value suitable for use. A filling valve facilitates filling of the cylinders when required. The ON-OFF valve controls the flow of oxygen when operated. Two outlets are connected directly to the pressure regulator (Fig. 2). Each outlet contains an internal check valve, a flow metering device, and an oxygen hose plug-in adapter. When a plug-in is inserted, it opens the check valve and allows flow into a mask, provided the cylinder ON-OFF valve is open.
 D.  An oxygen mask with an attached hose is secured to each cylinder assembly. For use, the hose has to be connected to the oxygen outlet on the cylinder.
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747-400
MAINTENANCE MANUAL

MOUNTING
BRACKET

LATCH FACE MASK (MAIN DECK CYLINDERS)
OXYGEN CYLINDER
MOUNTING
BRACKET

PROTECTIVE
OXYGEN CYLINDER
TAPE
(EXAMPLE)
STOWAGE BOX
RECESS AREA  FOIL POUCH 
BOX LID STOWAGE  HOOD 
EQUIPMENT PROTECTIVE BREATHING  ORONASAL CONE  CANNISTER 
Figure 1 Portable Oxygen Equipment 

C21360
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747-400
MAINTENANCE MANUAL

PRESSUREOUTLET REGULATOR ASSEMBLY

Portable Oxygen Equipment and Schematic
Figure 2

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