757 MAINTENANCE MANUAL
ELECTRICAL BONDING - INSPECTION/CHECK
_____________________________________
TASK 20-10-21-216-008
1. Inspection/Check of Electrical Bonding______________________________________
A. General
(1) Refer to SWPM 20-20-00, Electrical Bonding and Grounding, in the Standard Wiring Practice Manual, D6-54446.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-21
ALL ú ú 01 Page 601 ú Dec 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
1.
2.
3.
757 MAINTENANCE MANUAL
METAL SURFACES CLEANING/PAINTING
________________________________General
_______
A. This procedure contains five tasks. The first task is to hand clean with abrasives. The second task is to spot clean with a rotary bonding brush. The third task is to spot clean with a rotary abrasive disk. The fourth task is to remove paint with lacquer thinner or methyl ethyl ketone. The fifth task is to solvent clean bare, clad, or plated metal.
B. Use the tasks in this procedure to clean the faying surface bonds and bonding jumper installations. Do not use abrasives or wire brushes on plated surfaces, alclad aluminum that is not painted, or CRES that is not painted.
TASK 20-10-22-127-001Hand Clean with Abrasives
_________________________
A. General
(1)
Use this task for titanium. No other task in this procedure is applicable to titanium.
(2)
Do not apply abrasives to plated surfaces, alclad aluminum, or CRES.
B. Consumable Materials
(1)
B00137 Abrasive Paper, 180 grit, Federal Spec
P-P-121
(2)
B000138 Abrasive Cloth, 180-Grit, Federal Spec
P-C-451
C. Procedure
S 127-002
CAUTION: DO NOT LET PARTICLES FROM THE ABRASIVE CAUSE CONTAMINATION TO
_______ THE MECHANISMS OR ELECTRICAL EQUIPMENT. DAMAGE CAN OCCUR.
(1) Use a circular or elliptical movement of the abrasive paper or cloth to give an equally smooth surface.
TASK 20-10-22-147-003Spot Clean with a Rotary Bonding Brush
______________________________________
A. General
(1) Use this task to remove paint from metal or to remove Alodine, Iridite, or light anodize from aluminum.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-22
ALL ú ú 01 Page 701 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(2) Do not use rotary bonding brushes on plated surfaces or on metals not painted (for example, CRES or alclad aluminum). Clean these surfaces with a solvent.
B. Equipment
(1)
Drill motor or other applicable drive
(2)
Bonding brush, stainless steel, of correct size (Fig. 701).
C. Procedure
NOTE: Identify the bonding brush housings you can use on each metal.
____
Refer to Remove Paint with Lacquer Thinner.
S 147-026
CAUTION:_______DO NOT USE CARBON STEEL BONDING BRUSHES. STEEL PARTICLES IN METAL SURFACES COULD CAUSE DANGEOUS CORROSION.
DO NOT USE ROTARY WIRE BRUSHES OR ABRASIVE DISKS ON TITANIUM. REFER TO PROCEDURE, HAND CLEAN WITH ABRASIVES, TO CLEAN TITANIUM.
(1) Clean the necessary spot diameter.
NOTE: Use a drill motor or other applicable drive with a
____ stainless steel bonding brush of the correct size.
(a)
Apply brush intermittently and keep the cutting face parallel with surface.
(b)
Examine the results after each time you apply the brush.
NOTE: Keep the surface loss of metal to minimum.
____
(c)
Continue the procedure until the necessary area is clean.
(d)
If you cannot get through an anodic film, use the procedure, Spot Clean with a Rotary Abrasive Disk.
TASK 20-10-22-147-005
4. Spot Clean with a Rotary Abrasive Disk
______________________________________
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 STANDARD PRACTICES - AIRFRAME(68)
