(2)  
AIPC 35-21-00

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
 C. Procedure
 S 914-010-003
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 434-011-003

 (2)  
Remove the protective cap from the tee fitting.

 S 214-012-003

 (3)  
Examine the threads on the tee fitting to make sure they are clean.

 S 424-013-003
 CAUTION: HOLD THE TEE FITTING WITH A WRENCH TO INSTALL THE AUTOMATIC
_______ VENT VALVE. THIS WILL PREVENT DAMAGE TO THE DISTRIBUTION TUBING.
 (4)  
Install the automatic vent valve on the tee fitting.

 (5)  
Install the safety wire.

 S 434-014-003
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-02
 ALL  ú CONFIG 3 ú 02 Page 403 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-015-003
 WARNING:_______ OPEN THE SHUTOFF VALVE ON EACH PASSENGER OXYGEN CYLINDERS
 SLOWLY.  IF NOT, HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN
 IGNITION WITH THE OXYGEN.  THIS CAN CAUSE INJURY TO PERSONS AND
 DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 CAUTION:_______ DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH PASSENGER OXYGEN
 CYLINDERS MORE THAN 25 POUND-INCHES.  THIS CAN CAUSE DAMAGE TO

 THE SHUTOFF VALVE.
 (6)  Open the shutoff valve on each passenger oxygen cylinders as follows:
 (a)  
Slowly turn the shutoff valve until it is fully open. NOTE: The shutoff valve can be closed by hand which is

____ equivalent to 25 pound-inches.

 (b)  
Close the shutoff valve one-fourth of a turn.

 (c)  
Install a lockwire on the shutoff valve. NOTE: Use the 0.020 inch diameter copper lockwire

____ (AMM 20-11-28/401).
 S 414-016-003
 (7)  Close the access panels to the passenger oxygen cylinders. NOTE: The access panel is attached by snaps and velcro tape.
____
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 35-21-02
 ALL  ú CONFIG 3 ú 02 Page 404 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLOW CONTROL UNIT - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  These tasks are included in this procedure:
 (1)  
Removal of the flow control unit.

 (2)  
Installation of the flow control unit.

 (3)  
Flow Control Unit Leak Test.

 B.  The flow control unit is installed in the right sidewall adjacent to the oxygen cylinders (Fig. 401). Access to the flow control unit is through the access panel to the oxygen cylinder.
 C.  There is one electropneumatic flow control unit.
 TASK 35-21-04-004-001-003
 2.  Flow Control Unit 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)  
IPC 35-21-04

 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 864-003-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND
 2) 7D3 OXY RESET PWR

 (3)  
Open the access panel to the oxygen cylinders.

 S 014-004-003
 NOTE: The access panel is attached by snaps and velcro tape.
　
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