(c)
Install a lockwire on the shutoff valve.
NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-11-28/401).
S 795-096
(15)
Do a check at the oxygen cylinder and test connections for leaks with the leak detection compound.
S 035-097
(16)
Rub the leak detection compound off immediately after the check.
S 415-098
(17)
Close the access panels to the supernumerary oxygen cylinders.
TASK 35-21-00-795-099
6. Oxygen System Low Pressure Leak Test
____________________________________
A. Special Tools and Equipment
(1) G35001 Kit - Oxygen Supply System, Leak Test
B. Standard Tools and Equipment
(1)
Caps and Plugs - Package of Clean, Protective
(2)
Cylinder - Portable Test, 0-2000 psi (if applicable)
(3)
Reducer - Pressure, 15 psig (use with the portable test cylinder)
(4)
Rod - Metal, 1/4-inch diameter
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35-21-00
ALL ú ú 01B Page 521 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
C. 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)
G02311 Tape - Masking Non Residue, 3M-226
(7)
G01505 Copper Lockwire 0.020 inch diameter
D. 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
(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
E. Access
(1) Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 200 Upper Half Fuselage
F. Preconditions
S 865-100
(1) The systems that follow must be installed and serviceable to complete this test:
(a)
Electrical Power (AMM 24-22-00/201).
(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).
G. Procedure
S 915-101
(1) Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-102
(2) Open this circuit breaker and install the DO-NOT-CLOSE tag:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
S 015-103
(3) Open the access panels to the supernumerary oxygen cylinders.
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