747-400 AMM 飞机维护手册 氧气 OXYGEN(66)

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____ Simulated Automatic Actuation, Alternate (Electrical) Actuation, and the Oxygen Mask Drop Tests.
 (4)  
Gauge - Pressure, 0-2000 psi with an accuracy of | 2-1/2% graduations. The graduations must not be more that 100 psi apart, and a diameter of not less than 4 inches

 (5)  
Rod - Metal, 1/4-inch diameter

 B. 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) G01505 Copper Lockwire 0.020 inch diameter G01505
 C. 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

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747-400
MAINTENANCE MANUAL

 (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

 D. Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 200 Upper Half Fuselage
 E. Preconditions
 S 865-178
 (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)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 (d)  
Supernumerary Oxygen System in serviceable condition (AMM 35-21-00/201).

 F. Procedure
 S 915-179
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).

 S 865-180

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

 S 865-181

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

 S 865-182
 (4)  
Do the task: "Obtain Airplane Information Report" (Ref 31-61-00/201) to apply power to the EICAS (if necessary).

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

 S 865-184

 (6)  
If the supernumerary oxygen cylinders are used to do the test, do the steps that follow:

 S 015-183
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A
747-400
MAINTENANCE MANUAL

 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
 (a)  
Close all except one shutoff valve on the supernumerary oxygen cylinders.

 (b)  
Move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to ON.

 (c)  
All the oxygen box doors drop.

 (d)  
Move the switch to RESET (switch automatically moves back to NORMAL).
　
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