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

 (2)  
IPC 35-31-00

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

 D.  Procedure
 S 916-017
 (1)  
Read and obey the safety precautions and general instructions for the oxygen system before you do the maintenance (AMM 35-00-00/201).

 (2)
Turn the knob on the ON-OFF valve counterclockwise to open it.

 S 796-032

 (3)  
Do a check of the portable cylinder cylinder for leaks:

 S 866-003
 (a)  Apply the leak detection compound to all fittings and connections.
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747-400
MAINTENANCE MANUAL

MOUNTING
BRACKET

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

OXYGEN CYLINDER (EXAMPLE)
PROTECTIVE TAPE
STOWAGE BOX
RECESS AREA  FOIL POUCH  HOOD 
BOX LID STOWAGE 
EQUIPMENT PROTECTIVE BREATHING  ORONASAL CONE  CANNISTER 
Portable Oxygen Equipment Figure 601

 C21370
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MAINTENANCE MANUAL

TEMPERATURE - DEGREES FAHRENHEIT
-40 -22 -4 +14 +32 +50 +68 +86 +104 +122 +140
2000

1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700
PORTABLE OXYGEN CYLINDER PRESSURE - PSI

TEMPERATURE - DEGREES CELSIUS
MAXIMUM ALLOWABLE PRESSURE FOR FOR FULLY SERVICED PORTABLE OXYGEN CYLINDER

Oxygen Cylinder Pressure - Temperature Correction Chart
Figure 602

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747-400 MAINTENANCE MANUAL
 (b)  
Look for bubbles to find leaks.

 (c)  
Remove the leak detection compound immediately after you do the check to make the fittings and connections dry.

 CAUTION: DO NOT TIGHTEN THE FITTINGS AND CONNECTIONS MORE THAN
_______ THE TORQUE WHICH IS PERMITTED. THIS CAN CAUSE DAMAGE TO THESE PARTS
 1) If you find leaks, tighten the fittings and connections. 2) If you cannot stop the leaks, send the portable oxygen cylinder to an approved facility for an overhaul.
 NOTE: Do not permit the leaks to continue.
____
 S 216-033
 (4)  Make sure the portable oxygen cylinder is in compliance with local regulatory requirements currently in effect for hydrostatic test.
 NOTE: The last hydrostatic test data will be stamped on the
____
 neck of the oxygen cylinder.

 TASK 35-31-00-206-011
 3. Portable Oxygen Cylinder Pressure and Condition Check (Fig. 601, 602)
_____________________________________________________
 A. References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
IPC 35-31-00

 B. Access
 (1)  Location Zones
 200 Upper Half Fuselage
 221 Control Cabin, Left

 C. Procedure
 S 916-020
 (1)  Read and obey the safety precautions and general instructions for the oxygen system before you do the maintenance (AMM 35-00-00/201).
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