35-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-166
 CAUTION:_______ DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
 THAN 25 POUND-INCHES.  THIS CAN CAUSE DAMAGE TO THE SHUTOFF
 VALVE.

 (17) Close the shutoff valve on the oxygen bottle cart (or portable oxygen cylinder), or each oxygen cylinder.
 NOTE: The shutoff valve can be closed by hand which is
____ equivalent to 25 pound-inches.
 S 415-167
 (18)
 Do the task:  Supernumerary Oxygen Mask Installation (AMM 35-21-06/401) if it is necessary.

 S 015-168

 (19)
 Remove the tape or other devices used to hold the oxygen box doors in position.

 S 085-169

 (20)
 Disconnect the 0-150 psi pressure gage and the hose from test port (pressure).

 NOTE: The test port is found adjacent to the flow control units.
____
 S 085-170
 (21) If oxygen bottle cart (or portable oxygen cylinder) was used, do the steps that follow:
 WARNING:_______LOOSEN THE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (a)  
Slowly disconnect the oxygen bottle cart hose (or portable oxygen cylinder) from the coupling assembly at point B (Fig. 501).

 (b)  
Remove the (0-2000 psig) pressure gage at point C (Fig. 501).

 (c)  
Install a plug in supply manifold opening at point C (Fig. 501).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-171
 WARNING:_______LOOSEN THE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (22) Open the shutoff valve on each oxygen cylinder.
 (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 795-172
 (23)
 Do a check of the test connections for leaks with the leak detection compound.

 S 035-173

 (24)
 Rub the leak detection compound off with a clean cotton cloth immediately after the check.

 S 615-174

 (25)
 If a passenger oxygen cylinder was used to do the test, do the task: "Oxygen System Servicing (Cylinder Replacement)" (Ref 12-15-08/301) if necessary.

 (26)
 Close all the access panels to the supernumerary oxygen cylinders.

 S 865-176

 (27)
 Remove the electrical power if it is not necessary (Ref 24-22-00/201).

 S 415-175
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 35-21-00-715-177
 8. Oxygen Mask Drop Test
_____________________
 NOTE: Make sure there are sufficient persons to make sure oxygen
____ (or nitrogen, or airflow as applicable) goes through all the masks. This needs to be done before all the supply (oxygen or other gases) is released.
 A. Equipment
 (1)  
Caps and Plugs - Package of Clean, Protective

 (2)  
Cylinder - Portable Test, 0-2000 psi (if applicable)

 (3)  
Cart - Oxygen Bottle (oxygen quality air) or Cylinder - Portable Test, Scott Aviation, 225 Erie Street, Lancaster

 N.Y. (if applicable)
 NOTE: Three portable test cylinders are necessary for the
　
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