NOTE: It is only necessary to do up to the paragraph "Clean the
____ Opaque Plastic and Painted Surfaces" which is in the task "Clean the Airplane Equipment and Furnishings".
S 217-004
(4)
Do this task: "Passenger Oxygen Mask Hose- Inspection and Check" (Ref 35-21-06/601).
S 867-005
(5)
Do this task: "Install PSU Oxygen Mask" (AMM 35-21-06/401).
TASK 35-00-00-107-006
3. Oxygen System Component Cleaning
_________________________________
A. Standard Tools and Equipment
(1)
Cylinder - Portable Test
(2)
Caps and Plugs - Package of Clean, Protective
(3)
Bags - Polyethylene
B. Consumable Materials
(1)
G00669 Nitrogen per MIL-P-27401 (to be used with portable test cylinder) (or)
(2)
G00000 Air - Clean, Dry, with no particles or fibers more than 100 microns in the longest dimension per cubic foot of air. It must not have more than 3 PPM total hydrocarbon by weight or 7 PPM by volume. A moisture content not to 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 a portable test cylinder.
(3)
D00173 Krytox 240AC, MIL-G-27617 (Lubricate O-rings if neccessary)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-00-00
ALL ú ú 01 Page 702 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(4) G00713 Cloth - Clean, Dry, Lint-Free, White, Cotton
C. References
(1) 35-00-00/201, Oxygen
D. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right 200 Upper Half Fuselage
E. Procedure
S 917-013
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
S 167-015
(2)
Clean the contamination that cannot be removed with a dry cloth with solvent (Ref.CH 20), then rub the area dry.
S 167-016
CAUTION: ONLY USE CLEANING SOLVENTS ON THE OUTSIDE OF THE COMPONENTS FOR
_______ AN INSTALLED SYSTEM. DO NOT USE CLEANING SOLVENTS ON THE INSIDE OF THE OXYGEN SYSTEM COMPONENTS.
(3) Clean the components that cannot be cleaned by the above
instructions using the vapor degreasing method:
NOTE: Components must be removed from the airplane before they are
____
cleaned.
(a)
Disassemble the components such as the valves, regulators and oxygen cylinders.
(b)
Clean these components per the manufacturers overhaul manual.
(c)
Clean the thermal compensators by ultrasonic or vapor degreasing processes.
(d)
Clean the tubing and fittings by the vapor degreasing process. (Ref.CH 20-30)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-00-00
ALL ú ú 01 Page 703 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 167-010
(4)
If you have cleaned the components, remove the debris that remains with air and dry with nitrogen or air.
S 167-017
(5)
Rub with a clean, dry, lint-free white cotton cloth to clean the oxygen system components.
S 557-011
(6)
Store the components that are not to be installed in the airplane immediately:
(a) Individually seal the fittings in the polyethylene bags immediately after you have cleaned the standard BAC, NAS, AN and MS fittings.
CAUTION: DO NOT USE OTHER LUBRICANTS ON THE O-RINGS THAT HAVE BEEN
_______
LUBRICATED WITH KRYTOX 240AC.
(b)
Discard and replace the O-rings after the hoses are cleaned:
1) If the flexible hoses for the low pressure system for oxygen contains O-rings in the coupling asemblies. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 氧气 OXYGEN(7)
