747-400
MAINTENANCE MANUAL

TEST 
PORT 
LOW PRESSURE LINE 
TO THE UPPER 
DECK CABIN  INLET LINE 

TEST CONNECTION ON-OFF INDICATOR SEE C
ELECTROPNEUMATIC 
FLOW CONTROL UNIT 
RESET 
LEVER 
RESET SOLENOID 
FWD 
FLOW CONTROL UNITS 
(EXAMPLE) 
B 

ON 0
F F
ON-OFF INDICATOR C
Test Connections
Figure 501 (Sheet 2)

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MAINTENANCE MANUAL

PSU Oxygen Box
Figure 502

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MAINTENANCE MANUAL

 A. General
 (1)  The Simulated Automatic Actuation Test, Alternate (Electrical) Actuation Test, and Oxygen Mask Drop Test can be done with a portable test cylinder. They can also be done with one of the passenger oxygen cylinders installed on the airplane. The High Pressure Leak Test must be done with a portable test cylinder only.
 B. Special Tools and Equipment
 (1)  ME65B50263-1 Gauge - Pressure, 0-30 psi and Hose Assembly, Ashcroft P/N 1009, Stratford, Connecticut (Gage) and Hydraflow Inc., Los Angeles, California (Hose)
 C. Standard Tools and Equipment
 (1)  
Barometer (to determine atmospheric pressure in mm Hg)

 (2)  
Caps and Plugs - Package of Clean, Protective

 (3)  
Oxygen cart (oxygen quality air) or Cylinder - Portable Test (0-1850 psi) - Scott Aviation, 225 Erie Street, Lancaster N.Y. (if applicable)

 (4)  
Gauge - Pressure, 0-150 psi

 (5)  
Gauge - Pressure, 0-2000 psi with an accuracy of | 2-1/2%, with graduations no more that 100 psi, and a gauge diameter of not less than 4 inches

 (6)  
Reducer - Pressure, 15 psig (use with the portable test cylinder)

 (7)  
Rod - Metal, 1/4-inch diameter

 (8)  
Source - Variable Vacuum, capable of maintaining 25-inch Hg vacuum with minimum flow of 1 cfm

 D. 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)  
Tape - Masking, J6-3800-0200 (SCOTCH)

 E. References
 (1) G01505 Copper Lockwire 0.020 inch diameter G01505
 (2)  
12-15-08/301, Oxygen

 (3)  
24-22-00/201, Manual Control

 (4)  
31-61-00/201, Integrated Display System

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747-400
MAINTENANCE MANUAL

 (5)  
35-00-00/201, Oxygen

 (6)  
AMM 35-21-06/401, Supernumerary Oxygen Mask

 (7)  
　
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