(2)
Crew Rest
(3)
IPC 35-21-05
TASK 35-21-05-004-001
2. Supernumerary Unitized Valve Assembly Removal (Fig. 401)
_____________________________________________
A. Standard Tools and Equipment
(1) Caps and Plugs - Package of Clean Protective
B. References
(1)
35-00-00/201, Oxygen
(2)
35-21-19/401, Oxygen Box
(3)
IPC 35-21-05
C. Access
(1) Location Zone
200 Upper Half Fuselage
D. Procedure
S 914-002
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
S 014-003
(2)
Open the access panels to the oxygen cylinders which are attached by snaps and velcro tape.
S 844-004
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
UNITIZED VALVE ASSEMBLY
STREAMERS ARE NOT INSTALLED ON ALL THE MASKS A-A
Supernumerary Unitized Valve Assembly Installation (Example) Figure 401
L83348
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 014-005
(4)
Remove the oxygen box (Ref 35-21-19/401).
S 024-006
(5)
Remove the unitized valve assembly.
(a)
Remove the pintels from the mask shutoff valves.
(b)
Remove the mask hoses from the manifold outlets.
(c)
Remove the fasteners connecting the unitized valve assembly to the oxygen box.
(d)
Remove the unitized valve assembly from the oxygen box.
S 034-007
(6) Install the protective caps or plugs to open lines, fittings, or ports to prevent contamination of the system.
TASK 35-21-05-004-008
3. Supernumerary Unitized Valve Assembly Installation (Fig. 401)
__________________________________________________
A. References
(1)
35-00-00/201, Oxygen
(2)
35-21-19/401, Oxygen Box
(3)
IPC 35-21-05
B. Access
(1) Location Zone
200 Upper Half Fuselage
C. Procedure
S 914-009
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
(2)
Remove the protective caps or plugs from lines, fittings or ports.
(3)
Examine the fitting (threads) to make sure they are clean.
S 434-010
S 214-011
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A
747-400 MAINTENANCE MANUAL
S 424-012
WARNING: MAKE SURE ALL THE MASK SHUTOFF VALVES ARE IN THE OPENED (DOWN)
_______ POSITION. IF THIS IS NOT DONE, OXYGEN WILL NOT GO THE OXYGEN MASKS WHEN THE OXYGEN MASKS ARE OPERATED. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE OR EQUIPMENT.
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