C.  Access
 (1)  Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
 D.  Procedure
 S 916-006
 (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)  
Open the access panels to the oxygen cylinders.

 S 786-001

 (3)  
Do a check of the pressures on the cylinder pressure gages. Make sure the average of the system pressure is above the minimum necessary for dispatch.

 S 016-022
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A
747-400
MAINTENANCE MANUAL

(REF) LINE B-NUT OVERBOARD DISCHARGE  (REF) VALVE CYLINDER SHUTOFF (REF) COUPLING NUT CYLINDER HIGH PRESSURE 
PRESSURE GAGE (REF)  (REF) ASSEMBLY COUPLING  SEE  A 
A  (EXAMPLE) 

A  OUTBD  PASSENGER OXYGEN CYLINDER (EXAMPLE) 
TOGGLE LEVER (CLOSED POSITION) 
BAND STRAP CLAMP  T-BOLT HOLDER ASSEMBLY  B 
A  (AJUSTED IN THE FACTORY) NUT SPRING  T-BOLT A-A  B 
SAFETY PIN  B-B  TOGGLE LEVER 

Passenger Oxygen Cylinder Inspection
Figure 601

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747-400 MAINTENANCE MANUAL
 S 796-027
 (4)  
Do a check of the oxygen cylinders for leaks:

 S 796-007

 (5)  
Apply leak detection compound for the oxygen system to all fittings and connections.

 NOTE: Bubbles show leaks which must be corrected.
____
 S 096-010
 (6)  Rub off the leak detection compound for the oxygen system immediately after the check.
 (a)  
Tighten the connections to stop all leaks at the fittings.

 (b)  
Send the oxygen cylinder to an approved overhaul facility if you cannot stop the leaks. Leaks are not permitted.

 (c)  
Make sure it has not been more than three years since the 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.
 S 016-020
 (7)  Close all the access panels to the oxygen cylinders.
 TASK 35-21-00-206-012
 3. Oxygen Cylinder Security and Condition Check (Fig. 601)
____________________________________________
 A. References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
IPC 35-21-00

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
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747-400 MAINTENANCE MANUAL
 C. Procedure
 S 916-005
 (1)  
Read and obey the safety precautions and general instructions for the oxygen system before you do the maintenance (AMM 35-00-00/201).

 S 016-018

 (2)  
Open the access panel to the oxygen cylinders.

 S 216-017

 (3)  
Do a check of these components to make sure they are installed correctly:

 (a)  
Make sure the pressure transducer is installed correctly on each coupling assembly.

 (b)  
Make sure the pressure reducer is installed correctly on the each coupling assembly.

 (c)  
Make sure the coupling assembly is installed correctly on each passenger oxygen cylinder.

 (d)  
　
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