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747-400 MAINTENANCE MANUAL
(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 414-031
(11) Close the access panels to the oxygen cylinders.
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747-400 MAINTENANCE MANUAL
OXYGEN BOX - REMOVAL/INSTALLATION
_________________________________
1. General
_______
A. These tasks are included in this procedure:
(1)
Supernumerary Oxygen Box Removal
(2)
Supernumerary Oxygen Box Installation
B. The oxygen box in the supernumerary service unit (PSU) is installed in the PSUs in the upper deck area. Access to the oxygen box is at these areas.
(1)
Lavatories
(2)
Crew Rest
TASK 35-21-19-004-033
2. Supernumerary Oxygen Box Removal (Fig. 401)
________________________________
A. Standard Tools and Equipment
(1)
Rod - Metal, 3/32 inch in diameter
(2)
Caps and Plugs - Package of Clean, Protective
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-21-05
C. Access
(1) Location Zone
200 Upper Half Fuselage
D. Procedure
S 914-029
(1) Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 864-036
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(2) 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.
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A 747-400 MAINTENANCE MANUAL
OXYGEN BOX (EXAMPLE)
Supernumerary Oxygen Box Installation (Example)
Figure 401
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S 034-011
(3)
Insert a 3/32 inch diameter Allen wrench or metal rod into the release access hole and actuate the latch to release the mask door.
S 024-012
(4)
Remove the oxygen box.
CAUTION: DO NOT DAMAGE OR PULL ON THE OXYGEN MASKS, BECAUSE THIS
_______ CAN CAUSE DAMAGE TO THE AIRPLANE OR ENJURY TO PERSONS.
(a)
Slowly and continuously lower the door and permit the oxygen masks to drop freely.
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