35-11-04
 ALL  ú ú 02 Page 407 ú Jun 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PRESSURE REGULATOR - REMOVAL/INSTALLATION
_________________________________________
 1.  General
_______
 A.  These tasks are included in this procedure:
 (1)  
Removal of the pressure regulator

 (2)  
Installation of the pressure regulator

 B.  The pressure regulator is installed on the dripshield of the aft right sidewall in the flight compartment (Fig. 401). Remove the closure assembly to get access the pressure regulator in the right coat closet.
 TASK 35-11-05-004-001
 2.  Pressure Regulator 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 35-11-05

 C.  Access
 (1)  Location Zone
 222 Control Cabin Right

 D.  Procedure
 S 914-013
 (1)  Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
 S 864-016
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (2) Close the shutoff valve on each crew oxygen cylinder slowly.
 NOTE: Some airplanes have an optional second oxygen cylinder.
____
 NOTE: The shutoff valve can be tightened by hand which is
____
 equivalent to 25 pound-inches.

 (a)  Set the dilution control lever on the demand regulator to 100%.
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 35-11-05
 ALL  ú ú 01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INLET FROM PRESSURE REDUCER
PRESSURE REGULATOR

A
Pressure Regulator Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-11-05
 ALL  ú ú 01 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Set the PRESS TO TEST knob to EMERGENCY.

 (c)  
Move the RETEST lever (sliding control) on the mask stowage box to bleed the oxygen lines.

 S 034-011
 (3)  
Remove the closure assembly in the right coat closet to permit access to the pressure regulator (Fig. 401).

 S 024-003

 (4)  
Remove the pressure regulator:

 (a)  
Disconnect the inlet and the outlet lines from the pressure regulator.

 (b)  
Remove the mounting fasteners.

 (c)  
Remove the pressure regulator.

 S 034-004
 (5)  Install the protective caps or the plugs to the open lines, fittings or ports to prevent contamination of the system.
 TASK 35-11-05-404-005
 3. Pressure Regulator Installation (Fig. 401)
_______________________________
 A. Consumable Materials
 (1)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)

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

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

 (2)  
IPC 35-11-05

 C. Access
 (1)  Location Zone
 222 Control Cabin Right

 D. Procedure
 S 914-014
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
　
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