(2)
G00000 Source of clean, dry air with no particles or fibers larger than 100 microns in the longest dimension per cubic foot of air. This must not have no more than 3 PPM total hydrocarbon by weight or 7 PPM by volume. A moisture content not exceeding 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.
(3)
B00036 Freon 113
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 35-11-04/401, Pressure Reducer
(3)
AMM 35-21-12/401, Pressure Reducer
(4)
IPC 35-11-03
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
D. Procedure
S 917-013
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 027-003
(2)
Do the task: "Pressure Reducer Removal" to remove the coupling assembly on the crew oxygen cylinder (AMM 35-11-04/401).
NOTE: This task also removes the coupling assembly.
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S 027-004
(3) Do the task: "Pressure Reducer Removal" to remove the coupling assembly on the the passenger oxygen cylinder (AMM 35-21-12/401).
NOTE: This task also removes the coupling assembly.
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A 747-400 MAINTENANCE MANUAL
(4) S 217-005Do a visual check for the lint or mechanical blockage.
(5) S 967-018If you find lint or mechanical blockage do these tasks to replace the thermal compensator with the coupling assembly: (a) "Pressure Reducer Removal" and "Pressure Reducer Installation" (AMM 35-11-04/401). (b) "Pressure Reducer Removal" and "Pressure Reducer Installation" (AMM 35-21-12/401).
(6) S 167-006If no lint or mechanical blockage is found, remove the hydrocarbons by ultrasonic cleaning or by vapor degreasing.
(7) S 167-007Dry the thermal compensator with nitrogen or air.
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2.
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747-400 MAINTENANCE MANUAL
CREW OXYGEN SYSTEM - DESCRIPTION AND OPERATION
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General (Fig. 1)
_______
A. The crew oxygen system is a diluter-demand system designed to deliver emergency breathing oxygen to each crew station.
B. The crew oxygen system consists of these components:
(1)
Dual oxygen cylinders
(2)
Cylinder coupling assembly - one per cylinder
(3)
Thermal compensator - one per cylinder
(4)
Pressure reducer - one per cylinder
(5)
Pressure transducer - one per cylinder
(6)
Voltage averaging unit
(7)
Pressure regulator
(8)
Mask stowage boxes
(9)
Mask/regulator assemblies
(10)
Overboard discharge port and indicator
(11)
Supply and distribution lines
C. Oxygen is stored in the high-pressure oxygen cylinders. The pressure reducers, the pressure regulator, and the demand regulators togather decrease the cylinder pressure to useable levels for breathing. High-pressure indication is provided by the combination of the pressure transducers and the voltage averaging unit.
D. Oxygen servicing is accomplished by cylinder replacement with fully
charged cylinders (Ref 12-15-08/301).Oxygen Cylinder Assembly (Fig. 2)
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