TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 88 of 240
4-12
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
Table 4-4. Recommended Powered Abrasives for Corrosion Removal
y
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NAVAIR use. Thus, they are strictly prohibited for use
on Navy aircraft. Use of non-approved discs on aircraft
may result in serious damage to the substrate. It is
recommended that only one disc be utilized at a time on
the mandrel assembly. However, for larger surface
areas, discs can be ganged/stacked on the mandrel
assembly up to 4 discs thick (see Figure 4-2).
4-9.2.1.1. Two types of radial bristle discs with a
diameter of 3 inches are available for corrosion repair
and paint removal from aluminum, magnesium,
high-strength steel, and titanium surfaces: 3M SPA
(orange in color) is designed for light surface corrosion
discrepancies such as filiform corrosion, and 3M 360
(green in color) is designed for heavier corrosion
discrepancies, light sealant removal, and light to
moderate surface pitting.
4-9.2.1.2 Radial Bristle Discs on High-Strength Steel
(HSS). The 360 grit green disc is for removing light
surface oxidation and corrosion, but it will also remove
the IVD aluminum or cadmium plating. The 400 grit
orange disc will leave the IVD aluminum or cadmium
plating mostly intact. Therefore, it is recommended that
the 400 grit orange disc be used where only paint
removal is required, and the 360 grit green disc be used
as a replacement for abrasive wheels and flap brushes
to perform small corrosion repairs down to bare metal.
Examples of high-strength steel material locations on
aircraft include the nose and main landing gears, launch
bars, and tail/arresting gear assemblies.
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