(c)
Install a lockwire on the shutoff valve.

 NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-11-28/401).
 S 795-096
 (15)
 Do a check at the oxygen cylinder and test connections for leaks with the leak detection compound.

 S 035-097

 (16)
 Rub the leak detection compound off immediately after the check.

 S 415-098

 (17)
 Close the access panels to the supernumerary oxygen cylinders.

 TASK 35-21-00-795-099
 6. Oxygen System Low Pressure Leak Test
____________________________________
 A. Special Tools and Equipment
 (1) G35001 Kit - Oxygen Supply System, Leak Test
 B. Standard Tools and Equipment
 (1)
Caps and Plugs - Package of Clean, Protective

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

 (3)
Reducer - Pressure, 15 psig (use with the portable test cylinder)

 (4)
Rod - Metal, 1/4-inch diameter

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 35-21-00
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A
747-400
MAINTENANCE MANUAL

 C. Consumable Materials

 (1)  
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.

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

 (3)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)

 (4)  
G00669 Nitrogen per MIL-P-27401 (use with the portable test
 cylinder) (or)

 (5)  
G00019 Oxygen - Chemical Gaseous per MIL-O-27210 Type 1 (use with the portable test cylinder)

 (6)  
G02311 Tape - Masking Non Residue, 3M-226

 (7)  
G01505 Copper Lockwire 0.020 inch diameter

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

 (2)  
24-22-00/201, Manual Control

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

 (4)  
35-00-00/201, Oxygen

 (5)  
AMM 35-21-06/401, Supernumerary Oxygen Mask

 (6)  
35-21-08/401, Bleed Relief Valve

 (7)  
35-21-08/501, Bleed Relief Valve

 (8)  
WDM 35-11-11, 35-11-12, 35-11-13

 (9)  
SSM 35-11-01

 E. Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 200 Upper Half Fuselage
 F. Preconditions
 S 865-100
 (1)  The systems that follow must be installed and serviceable to complete this test:
 (a)  
Electrical Power (AMM 24-22-00/201).

 (b)  
Supernumerary Oxygen system in serviceable condition (AMM 35-21-00/501).

 (c)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 G. Procedure
 S 915-101
 (1)  Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 865-102
 (2)  Open this circuit breaker and install the DO-NOT-CLOSE tag:
 (a)  P7 Overhead Circuit Breaker Panel
 1)  7D4  OXYGEN VALVE & IND
 S 015-103
 (3)  Open the access panels to the supernumerary oxygen cylinders.
　
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