F. To remove normal corrosion refererence Corrosion Prevention Manual, (CPM 20-40-00, Part 1).
G. For data on the quantity of corrosion you can remove, refer to the Structural Repair Manual.
TASK 51-24-07-207-001
2. Inspection/Check for Rust on the Head of Steel Fasteners
________________________________________________________
A. Procedure
S 217-002
(1) To find skin corrosion, look for fastener head rust and for discoloration of the adjacent anodized skin. To repair skin corrosion refer to paragraph 3.
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TASK 51-24-07-107-003
3. Rust and Corrosion Removal from Steel Fasteners________________________________________________
A. Equipment
(1)
Magnifying Glass - 5X to 10X magnification
(2)
Portable Blaster - Edul-O-Matic E10A,
Clementina LTD., San Francisco, California
B. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK),
TT-M-261
(2)
G00270 Tape - Masking, No. 221, 3M Company
(3)
Grit - Abrasive, Aluminum Oxide, Grit No. 154
(600-4F Mesh)
(4)
G00382 Paper - Abrasive, Aluminum Oxide,
240-Grit
(5)
E00017 Scraper - Hardwood
C. References
(1) AMM 51-21-01/701, Interior and Exterior Finishes (Paint Stripping)
D. You can remove rust and corrosion as follows:
S 117-004
(1)
Remove corrosion preventive paint in the corroded area (AMM 51-21-01/701).
S 357-005
(2)
You cannot remove BMS 10-11 Type I or BMS 10-20 primer with paint stripper. You can rub the area adjacent to the corrosion with abrasive paper to mix the primer into the base metal.
S 147-034
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
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(3)
Remove the fastener sealant with a hardwood scraper and solvent, Series 80 (AMM 20-30-80/201).
S 127-007
(4)
Use a grit spray to remove the head rust. You can use a grit spray to remove corrosion to the depth that is specified in Chapter 57 of the Structural Repair Manual. Do not grit spray aircraft skin that does not have corrosion. You can also remove rust and corrosion with 240-grit aluminum oxide paper or cloth.
NOTE: Put covers on all fuel tank vents and fill points to keep the
____
grit out of the tanks.
S 217-008
(5) After you remove the rust and skin corrosion, examine the countersunk area around the fastener heads for corrosion. Use a 5X to 10X magnifying glass to do the inspection.
NOTE:____Do not let the skin move when you replace the rivets. For rows of rivets, you can remove and replace a single row of rivets at a time. For a single row of rivets, you can remove and replace every other rivet.
S 127-035
(6) If you find corrosion in the countersunk area, you must remove the fasteners. To remove the corrosion refer to Chapter 57 of the Structural Repair Manual.
TASK 51-24-07-107-010
4. Clean the Skin Before the Application of Alodine
________________________________________________
NOTE: Clean the skin or fasteners if all primer or finish has been
____
removed. Do this step before you apply the alodine finish.
A. Consumable Materials 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 结构 STRUCTURES(40)
