(e)  
Make sure the oxygen cylinder is corrrectly installed to the support brackets and straps.

 S 216-016
 (4)  
Make sure the oxygen cylinder is installed correctly:

 S 216-015

 (5)  
Make sure the oxygen cylinder is in satisfactory condition:

 (a)  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 416-015
 (6)  Close the access panels to the oxygen cylinders.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-00
 ALL  ú ú 02 Page 604 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AUTOMATIC VENT VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General
_______
 A.  The following tasks are included in this procedure:
 (1)  
The removal of the automatic vent valve.

 (2)  
The installation of the automatic vent valve.

 B.  The automatic vent valve is found on the distribution tube approximately one foot away from the crew oxygen cylinder. Access is through the panel to the crew oxygen cylinders.
 TASK 35-21-02-004-001-003
 2.  Automatic Vent Valve Removal (Fig. 401)
____________________________
 A.  Standard Tools and Equipment
 (1)  Caps and Plugs - Package of Clean, Protective
 B.  References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
AIPC 35-21-00

 C.  Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
 D.  Procedure
 S 914-002-003
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 014-003-003

 (2)  
Open the cylinder access panels.

 NOTE: The access panels are attached by the snaps and velcro tape.
____
 S 864-004-003
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH PASSENGER OXYGEN
_______ CYLINDER MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (3)
Close the shutoff valve to each passenger oxygen cylinder.

 S 014-005-003

 (4)  
Open the access panel to the crew oxygen cylinders to get access to the automatic vent valve.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-02
 ALL  ú CONFIG 3 ú 02 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

AUTOMATIC
VENT VALVE

CYLINDER (EXAMPLE)

Automatic Vent Valve Installation
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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L82218
A
747-400
MAINTENANCE MANUAL

 S 034-006-003
 (5)  Cut the safety wire.
 S 024-007-003
 CAUTION: HOLD THE TEE FITTING WITH A WRENCH TO REMOVE THE AUTOMATIC VENT
_______ VALVE. THIS WILL PREVENT DAMAGE TO THE DISTRIBUTION TUBING.
 (6)  
Remove the automatic vent valve from the tee fitting.

 S 034-008-003

 (7)  
Install the protective cap to the tee fitting to prevent contamination of the the system.

 TASK 35-21-02-404-009-003
 3. Automatic Vent Valve Installation (Fig. 401)
_________________________________
　
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