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 1.  General_______
 A.  The oxygen systems send the high pressure gaseous oxygen at low pressure to the crew and supernumerary passengers (Fig. 1). High pressure oxygen is kept in oxygen cylinders. Each oxygen cylinder includes a safety discharge device to give protection against too much pressure. The pressure is decreased through applicable means, and sent to the crew and supernumerary outlets.
 B.  Two oxygen systems are supplied: the crew oxygen system , 35-10-00 and the supernumerary oxygen system, 35-20-00. An emergency oxygen supply is given by the portable oxygen equipment, 35-30-00.
 (1)  
In the crew system, the oxygen cylinder pressure is decreased through a pressure reducer and pressure regulator. Any additional or protective oxygen is sent through individual mask stowage boxes.

 (2)  
The supernumerary oxygen system automatically supplies oxygen to the crew. This happens whenever the cabin pressure drops to a value equivalent to an altitude of 13,250 to 14,500 feet. System operation, pressure reduction, and flow control are started automatically by continuous flow control units. The system can also be started by a switch on the P5 Pilot's Overhead Panel.

 (3)  
Portable oxygen equipment in the control cabin or upper deck cabin supplies oxygen for first aid and walk-around use.

 C.  Oxygen System Servicing
_______________________
 (1)  For oxygen system servicing, do this task: Oxygen - Servicing (AMM 12-15-08/301).
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 35-00-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CREW OXYGEN SYSTEM

EICAS INTERFACE UNITS (EIU'S)
Oxygen System Block Diagram Figure 1
M18099
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 35-00-00
 ALL  ú CONFIG 2 ú 02 Page 2 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 GASEOUS OXYGEN - MAINTENANCE PRACTICES
______________________________________
 1.  General
_______
 A.  This procedure provides the following information for gaseous oxygen systems:
 (1)  
Safety precautions

 (2)  
General maintenance data

 (3)  
General maintenance practices.

 B.  Read this procedure before you do maintenance on gaseous oxygen systems.
 TASK 35-00-00-912-052
 2.  Gaseous Oxygen System Maintenance Practices
___________________________________________
 A.  Consumable Materials
 (1)  
G00713 Cloth - Clean, Dry, Lint-Free, White, Cotton

 (2)  
G01306 Gloves - Clean, Dry, Lint-Free, White, Cotton

 (3)  
G00092 Oxygen System Leak Detection Compound -MIL-L-25567

 (4)  
G01293 Tape, Teflon - Specification MIL-T-27730
 1/4 inch wide

 

 (5) G01505 Copper Lockwire-0.020 inch diameter G01505
 B.  References
 (1)  
20-41-01/201, Static Grounding

 (2)  
20-51-01/201, Standard Torque Values

 (3)  
35-00-00/701, Oxygen

 C.  Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half - Right 200 Upper Half Fuselage
 D.  Procedure - Safety Precautions
 S 912-075
 WARNING: DO NOT WORK ON THE PRESSURIZED OXYGEN SYSTEM WHEN THERE IS OIL,
_______ GREASE, FLAMMABLE SOLVENTS, DUST, LINT, METAL FILINGS, OR OTHER COMBUSTIBLE MATERIALS IN THE AREA. THESE MATERIALS CAN CAUSE A FIRE OR AN EXPLOSION WHEN THEY ARE NEAR PRESSURIZED OXYGEN.
 (1)  Do not work on the pressurized oxygen system near oil, grease, flammable solvents, dust, lint, metal filings, or other flammable materials.
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