TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
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<strong>TO</strong> <strong>35</strong>-1-3<br />
2.2.2.2 To scuff sand a composite surface for overcoating<br />
only use medium grade (Grade C) abrasive mats (A-A-58054)<br />
without powered tools for scuff sanding of painted composite<br />
surfaces. Fine (Grade B) or very fine (Grade A) abrasive mats<br />
may be used with an orbital sander. The abrasive mat can be<br />
wet with fresh water, or diluted cleaning compounds listed in<br />
Table 2-2 for light soils, to prevent clogging the pad.<br />
2.2.3 Coating Removal on Metallic Surfaces. For areas of<br />
several square inches, paint may be removed using abrasive<br />
mats or flap brushes, taking care not to remove underlying<br />
metal. Chemical paint removal, may be used for areas larger<br />
than several square inches. Plastic media blasting or medium<br />
pressure water blasting, may be used at organizational levels<br />
of maintenance activities and depots to remove paint on equipment<br />
with panel skins thicker than 0.0625 inches (16 gauge).<br />
2.2.4 Grinding. Grinding is normally accomplished with<br />
motorized grinding equipment and rubberized abrasive<br />
wheels, discs or abrasive belts. Grinding is normally used to<br />
remove heavy corrosion by wearing the corrosion away. Care<br />
should be taken with this corrosion removal process as sound<br />
metal is also removed with the corrosion product. The basic<br />
steps in grinding are:<br />
2.2.4.1 Protect adjacent components from scale, chips, and<br />
corrosion products.<br />
2.2.4.2 If grease or oil is present, clean areas with the appropriate<br />
cleaner(s) listed in this <strong>TO</strong> prior to mechanical removal<br />
operations. Ensure all oil and grease residues are removed<br />
before proceeding.<br />
2.2.4.3 Remove paint and corrosion until a corrosion-free<br />
surface is reached. Continue grinding to remove coarse irregularities.<br />
Use fine abrasive paper to polish the surface to the<br />
desired finish.<br />
2.2.4.4 Immediately apply the final protective paint or other<br />
corrosion preventive finish.<br />
2.2.5 Wire Brushing.<br />
The use of goggles or face shield is mandatory when<br />
using motor driven wire brushes since corrosion particles<br />
can break loose and fly off. Conduct all painting<br />
operations only in an approved spray booth<br />
equipped with adequate ventilation and exhaust.<br />
Do not use carbon steel or copper wire brushes on<br />
aluminum surfaces. Carbon steel or copper particles<br />
may become embedded in the aluminum causing galvanic<br />
corrosion to occur.<br />
Wire brushing is a mechanical cleaning operation usually<br />
accomplished with a hand wire brush or a wire brush mounted<br />
on a motor driven wheel. By using different types of brushes,<br />
and various kinds, length, and gages of wire, a wide, range of<br />
mechanical cleaning actions are possible. Wire brushing is<br />
used to remove heavy corrosion and imbedded paint or dirt. A<br />
typical wire brushing procedure follows:<br />
2.2.5.1 Protect adjacent components from scale, chips, and<br />
corrosion products.<br />
2.2.5.2 If grease or oil is present, clean areas with the appropriate<br />
cleaner(s) listed in this <strong>TO</strong> prior to wire brushing operations.<br />
Ensure all oil and grease residues are removed before<br />
proceeding.<br />
2.2.5.3 Remove loose corrosion with a hand scraper or pneumatic<br />
tools.<br />
2.2.5.4 Wire brush area to a sound metal subsurface, ensuring<br />
all of the corrosion deposits are removed from the corrosion<br />
pits.<br />
2.2.5.5 After mechanical cleaning and rework has been completed,<br />
a final surface treatment and/or protective paint finish,<br />
as listed in this <strong>TO</strong>, shall be applied as soon as possible.<br />
2.2.6 High-Pressure Water (HPW) Paint Removal<br />
Method.<br />
HPW paint removal system can cause severe damage<br />
to equipment and injury of personnel if instructions<br />
are not followed properly.<br />
High-pressure water (40,000 PSI) paint removal is authorized<br />
for use at depot and field-level operations subject to meeting<br />
all personnel training, safety, and technical data requirements.<br />
HPW equipment is an excellent method for paint removal<br />
from support equipment. The HPW system can be used with<br />
or without blast abrasive such as bicarbonate of soda. These<br />
instructions are not intended to be all-inclusive, but are general<br />
guidelines to be used in conjunction with applicable system<br />
specific equipment manuals and/or a definitive process<br />
order.<br />
Change 4 2-17