35-21-00
ALL ú ú 01B Page 516 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
Cylinder - Portable Test, 0-2000 psi (if applicable)
(3)
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
(4)
Fitting - Tee
(5)
Hose - Flexible, high pressure (optional)
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)
AMM 12-15-08/301, Oxygen
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 31-61-00/201, Integrated Display System
(4)
AMM 35-00-00/201, Oxygen
(5)
AMM 35-21-06/401, Supernumerary Oxygen Mask
(6)
AMM 35-21-08/401, Bleed Relief Valve
(7)
AMM 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 865-082
(1) The systems that follow must be installed and serviceable to complete this test:
(a) Electrical Power (AMM 24-22-00/201).
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35-21-00
ALL ú ú 01B Page 517 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(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).
F. Procedure
S 915-083
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 015-084
(2)
Open the access panels to the oxygen cylinders.
NOTE: The oxygen cylinders are attached by snaps and velcro tape.
____
S 865-085
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 valves on the oxygen cylinders:
S 425-086
(4)
Install the portable test cylinder:
WARNING:_______LOOSEN THE PLUG CAREFULLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAUSE THE TEMPERATURE TO INCREASE. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(a)
Disconnect the inlet line from the flow control unit at point
A.
(b)
Put a cap on the open inlet port of the flow control unit to prevent contamination of the system.
(c)
Connect the portable test cylinder and the 0-2000 psi pressure gage to the inlet line at point A.
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