(2)  
Mask - Demand Flow (As Applicable)

 C.  References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
IPC 35-31-00

 D.  Access
 (1)  Location Zone
 200 Upper Half Fuselage

 E.  Procedure
 S 915-007
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 785-002

 (2)  
Do a check of the pressure gage indication.

 NOTE:____Pressures must be 1800 psi corrected to 70°F (21°C) . If the pressure is less than this value, fill the portable oxygen cylinder again.
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747-400 MAINTENANCE MANUAL
 S 865-003
 (3)  
Turn the knob at least one-half turn counterclockwise to open the ON-OFF valve.

 S 785-004

 (4)  
Connect the mask hose fitting in each of the constant flow outlets. Use a flowmeter to do a check of the flow of each outlet.

 NOTE: Each of the constant flow outlets is identified for flow and
____ altitude position by two numbers divided by a dash. The first number shows the flow in liters per minute, and the second shows the altitude. In locations where the outlet is not identified or the code cannot be read, see the part number. The flow and the altitude position can be read on the part number on the basic equipment (Fig. 502). To get the necessary flow at the shown altitude, the outlet flow position for the ground level must be in the range shown in Fig. 503.
5500-A1A-C5A

Cylinder Flow and Altitude Codes
Figure 501

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747-400
MAINTENANCE MANUAL

Flow of Oxygen in Stan- ALTITUDE - FEET X 1000 
Specified Altitude mm Hg, 32`F) at the dard Liters/Minute (760  5  10  15  20  25  30 
(760 mm Hg, 32`F) at the Ground Level Flow of Oxygen in Standard Liters/Minute 

8.0 2.7 2.5 2.0 0.5 3.0 7.0 4.0  3.37 3.07 2.51 0.74 3.72 8.40 4.83 9.58  4.98 8.52 0.86 2.65 9.71 3.85 3.48 3.21  5.10 8.71 9.92 3.97 3.58 3.30 2.72 0.91  8.81 5.21 4.08 3.65 3.40 2.80 0.96 10.02  8.91 5.30 4.14 3.72 3.44 2.84 1.00 10.12  9.02 1.08 5.38 4.22 3.78 3.47 2.89 10.25 

Ground Level Constant Flow Position
Figure 502

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747-400 MAINTENANCE MANUAL
 PORTABLE OXYGEN EQUIPMENT - INSPECTION/CHECK
____________________________________________
 1.  General_______
 A.  These tasks are included in this procedure:
 (1)  
Portable oxygen cylinder leak check

 (2)  
Portable oxygen cylinder pressure and condition check

 (3)  
A visual check of the foil pouch on the protective breathing equipment (PBE).

 B.  The portable oxygen bottles are installed at locations that permit easy access (Fig. 601).
 C.  The portable oxygen bottles and the PBEs are installed at locations that permit easy access (Fig. 601).
 TASK 35-31-00-206-001
 2.  Portable Oxygen Cylinder Leak Check (Fig. 601)___________________________________
 A.  Consumable Materials
 (1)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)

 (2)  
G00713 Cloth - Clean, Dry, Lint-free, White, Cotton
　
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