Technical data

underlying surface. Table 2-1, Table 2-2, and Table 2-3 shall
be used to determine the abrasive material to be used for
topcoat or primer removal and the substrate metal it may be
used on.
2.10.3 Hand Held Abrasive Removal.
• Damage to clad/Alclad or anodize surfaces
will reduce the corrosion protection in those
areas.
• Motor-driven wire brushes and discs and abra-
sive blasting shall not be used on flexible,
braided copper wire, cables, hoses, and lines
as these methods can cause severe damage to
these components.
• Magnesium particles, powder, or dust are
extreme fire hazards. Motor-driven wire
brushes and abrasive flap brushes and abrasive
blast media other than those listed in Table
2-1, Table 2-2, and Table 2-3 shall not be used
for finish system removal from magnesium
alloy surfaces. Keep work area clean. Do not
permit flammable materials or any source of
ignition into the area.
• Finish system removal using motor-driven
abrasives can generate airborne particles that
are hazardous to the skin, or respiratory tract.
Work pieces and motorized equipment shall be
properly electrically grounded, and personnel
shall wear dust/particulate respirators,
goggles, gloves, and full sleeved shirts when
using motor-driven abrasives. Do not stand
above, below or directly next to other workers
performing these operations. Avoid being
“downwind” from others using mechanical
sanders. Consult Bioenvironmental Engineer-
ing Services for respiratory and ventilation
requirements.
Abrade the finish system topcoat from the surface down to the
primer with hand-held metallic wool, abrasive mat, abrasive
cloth, or wire brushes as specified in Table 2-1 and Table 2-3.
If required, change the abrasive being used and abrade the
primer from the substrate material, taking care not to damage
the metal substrate.
2.10.4 Motor Driven Abrasive Removal.
Do not mount an abrasive on a motor driven tool
having an operational speed higher than the
maximum RPM rating of the abrasive. This can
result in disintegration of the abrasive and can
cause injury to personnel.
Abrade the finish system topcoat from the surface down to the
primer with motor driven wire brushes, or either a random
orbital tool or pneumatic drill motor fitted with a Roloc™ or
hook and loop mounted surface conditioning disc, a disc
fabricated from an abrasive cloth sheet, a Roloc™ Bristle
disc, or Radial Bristle disc. Select the abrasive for use per
Table 2-2 and Table 2-3. Use sanders and grinders attached to
high efficiency vacuum systems for dust recovery. Use of a
random orbital sander or a pneumatic drill motor fitted with
the surface conditioning disc is preferable. This method
provides the fastest removal rate with the least possibility of
damage to the metal substrate and the longest abrasive life
due to the non-loading characteristics of this type of disc.
Keep sander heads flush against the surfaces being sanded
and apply the least amount of pressure necessary to effec-
tively remove the finish system topcoat and not go through
the primer and gouge or abrade the metal substrate. Abrade
the primer from the surface with the same methods used for
the topcoat, but with finer grade abrasives per Table 2-2 and
Table 2-3. Again, the motor-driven surface conditioning disc
is preferred, and only enough pressure to remove the primer
without gouging and abrading the metal substrate shall be
applied. Always use high efficiency vacuum systems attached
to the tools for dust recovery.
2.10.5 Stainless Steel (CRES) and Nickel Based Al-
loys. After completing mechanical removal using materi-
als per Table 2-1, Table 2-2, and Table 2-3, polish the surface
with hand held aluminum oxide/nylon mesh abrasive mat
(very fine) or either a random orbital tool or pneumatic drill
motor (12,000 RPM max) fitted with a (very fine) grade
“Scotch-Brite” aluminum oxide/nylon mesh roloc or hook
and loop mounted surface conditioning disc.
2.10.6 Dust Removal. After the finish system has been
removed, use HEPA vacuums with appropriate attachments to
vacuum dust from aircraft and facility floors. Do not use
compressed air unless absolutely necessary to remove dust
from very narrow cracks and crevices.
TO 1-1-8
2-14