(2)  
G00000 Air - Clean, Dry with no particles or fibers larger than 100 microns in the longest dimension per cubic foot of air. It must not have no more than 3 PPM total hydrocarbon by weight or 7 PPM by volume. The moisture content can not exceed 0.00002 grams per liter of air at 70°F and 760 MM mercury. This is equivalent to a dew point of -63.6°F at 760 MM mercury. This air is to be used with portable test cylinder.

 (3)  
G00713 Cloth - Clean, Dry, Lint-Free, White Cotton

 (4)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)

 (5)  
G00669 Nitrogen per MIL-P-27401 (use with the portable test cylinder) (or)

 (6)  
G00019 OXYGEN - Chemical Gaseous per MIL-O-27210 Type 1 (use with the portable test cylinder)

 C. References
 (1)  
AMM 12-15-08/301, Oxygen

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 31-61-00/201, Integrated Display System

 (4)  
AMM 35-00-00/201, Oxygen

 (5)  
AMM 35-21-06, Supernumerary Oxygen Mask

 (6)  
WDM 35-11-11, 35-11-12, 35-11-13

 (7)  
SSM 35-11-01

 D. Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
 E. Preconditions
 S 865-024
 (1)  The systems that follow must be installed and serviceable to complete this test:
 (a)  
Electrical power (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS) (AMM 31-61-00/501).

 (c)  
Oxygen system (AMM 35-00-00/201).

 (d)  
Airplane in Ground Mode (AMM 32-09-02/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 F. Procedure
 S 915-025
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).

 S 865-026

 (2)  
Supply the electrical power (Ref 24-22-00/201).

 S 865-027

 (3)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND
 2) 7D3 OXYGEN RESET PWR

 S 865-028
 (4)  
Do the task: "Obtain Airplane Information Report" (Ref 31-61-00/201) to apply power to the EICAS (if necessary).

 S 865-030

 (5)  
Open the access panels to the supernumerary oxygen cylinders.

 NOTE: The oxygen cylinders are attached by snaps and velcro tape.
____
 S 715-031
 (6)  
Make sure the shutoff valves on the supernumerary oxygen cylinders are opened.

 S 495-032

 (7)
If you use portable "test" cylinder(s), do the steps that follow:

 NOTE: The portable "test" cylinder(s) must have 1500-1850 psig of
____ pressure and provide sufficient volume of oxygen to do the test.
 (a)  Close the shutoff valve on each supernumerary oxygen cylinder.
 NOTE: The shutoff valves can be closed by hand which is
____ equivalent to 25 pound-inches.
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747-400 MAINTENANCE MANUAL
 WARNING:_______ LOOSEN THE PLUG CAREFULLY. THE REMAINING OXYGEN CAN
 RELEASE WITH A LARGE FORCE AND CAUSE THE TEMPERATURE TO
 INCREASE.  THIS CAN START AN IGNITION WITH THE OXYGEN AND
 CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND

 EQUIPMENT.
 (b)  
Remove the plug at point B (Fig. 501) and connect the portable test line to point B.
　
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