35-21-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 BLEED RELIEF VALVE - REMOVAL/INSTALLATION
_________________________________________
 1.  General
_______
 A.  These tasks are included in the procedure:
 (1)  
Removal of the bleed relief valve

 (2)  
Installation of the bleed relief valve

 B.  Bleed relief valves are installed in the distribution lines for the low oxygen pressure. Access and location to the bleed relief valves are shown in Figure 401 and 402.
 TASK 35-21-08-004-001
 2.  Bleed Relief 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)  
IPC 35-20-51

 (3)  
IPC 35-21-00

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

 D.  Procedure
 S 914-017
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

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

 S 014-022
 S 864-024
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
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 35-21-08
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
BLEED RELIEF VALVE
SEE A FRAME (REF)
OXYGEN BOX (EXAMPLE)
DISTRIBUTION FWD LINES
UPPER DECK
BLEED RELIEF UPPER DECK VALVE
ADAPTER
O-RING
DISTRIBUTION LINE FOR THE LOW PRESSURE SYSTEM
BLEED RELIEF VALVE
A
Bleed Relief Valve Installation Figure 401
C29545
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (3)  Close the shutoff valve on each oxygen cylinder slowly.
 NOTE: The shutoff valve can be tightened by hand which is
____
 equivalent to 25 pound-inches.

 S 014-004
 (4)  Get access to (Fig. 402) and find the bleed relief valves which are found in the distribution lines.
 S 034-005
 CAUTION: ATTACH A WRENCH TO THE FLAT SIDES OF THE ADAPTER AND HOLD THE
_______ ADAPTER WHEN YOU REMOVE THE BLEED RELIEF VALVES. THIS WILL PREVENT DAMAGE TO THE DISTRIBUTION LINES.
 (5)  
Cut the safety wire.

 S 024-006

 (6)  
Screw out the bleed relief valve from the adapter.

 S 034-007

 (7)  
Install a protective cap or plug to open the adapter to prevent contamination of the system.

 TASK 35-21-08-404-008
 3. Bleed Relief Valve Installation (Fig. 401)
_______________________________
 A. Consumable Materials
 (1)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-225567)

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

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

 (2)  
AMM 35-21-00/501, Oxygen System

 (3)  
IPC 35-20-51

 (4)  
IPC 35-21-00

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