(2)
Rod - Metal, 1/4-inch in diameter

 C.  Consumable Materials
 (1)  
G00669 Nitrogen per MIL-P-27401 (to be used with portable test cylinder) (or)

 (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)
G00294 Tape - Masking Permacel No. 76

 D.  References
 (1)
AMM 35-00-00/201, Oxygen

 (2)
AMM 24-22-00/201, Manual Control

 (3)
AMM 31-61-00/501, Integrated Display System (IDS)

 (4)
AMM 35-21-00/501, Oxygen System

 (5)
AMM 32-09-02/201, Air/Ground Relays

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

 (7)
AMM 35-21-15/401, Test Adapter

 (8)
IPC 35-20-51

 (9)
IPC 35-21-00

 E.  Access
 (1)  Location Zone
 200 Upper Half Fuselage

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747-400 MAINTENANCE MANUAL
 F. Preconditions
 S 865-029
 (1)  The systems that follow must be installed and serviceable to complete this test:
 (a)  
Electrical power on (AMM 24-22-00/201).

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

 (c)  
Passenger Oxygen System, serviceable (AMM 35-21-00/501).

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

 G. Prepare for Test
 S 915-016
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 015-020

 (2)  
Open the access panels to the oxygen cylinders.

 S 865-023
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (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 865-003
 (4)
Make sure the distribution line do not have any open connections.

 S 865-014

 (5)  
Use masking tape or other appropriate means to loosely fasten the oxygen box doors.

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747-400 MAINTENANCE MANUAL
 S 485-004
 (6)  Install the test equipment.
 (a)  Get access to the test adapters and connect the ME65B50263-3 pressure gage to one of the test adapters.
 NOTE: The test adapters are installed on the right side
____ sidewall in the forward cargo compartment. This is adjacent to to the continuous flow control units (AMM 35-21-15/401). Access to the test adapter is through the access panels (to the oxygen cylinders) which are attached by snaps and velcro tape.
 (b)  Connect the portable test cylinder to the other test adapter.
 S 865-005
 (7)  Locate all the bleed relief valves (AMM 35-21-08/401).
 H. Do a Test of the Bleed Relief Valve.
 S 865-006
 WARNING: OPEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER SLOWLY.
_______ IF NOT, HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
　
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