abrasive at high velocity. The abrasive may be
glass beads, steel grit or organic materials and is
carried to the surface by air at high velocity. This
should not be applied on surface where critical
The use of goggles or face shield is
dimensions must be maintained or on thin struc-
mandatory since paint particles can
tures which can warp.
break loose and fly off.
c. Wire Brushing. Wire brushing is a mechanical
abrasive operation done usually with a hand wire
brush or a wire brush mounted on a motor driven
wheel. By using different types of brushes and vari-
Do not use steel brush or steel wool on
ous lengths and gages of wire, a wide range of abra-
non-ferrous surfaces. Metal particles
sive action is possible. Use wire brushing to remove
will become embedded in the substrate,
heavy corrosion and imbedded paint, especially
causing corrosion by galvanic action
where chemical treatment is not practical. A typical
between dissimilar metals.
wire brushing procedure follows:
(3) Wipe area with clean damp cloth fol-
lowed by wiping dry, with a clean, dry lint-free cloth.
(1) Protect adjacent components from scale,
Areas may be blown with warm oil-free air or gas-
chips, and dust.
(2) If grease or oil are present, clean area by
Magnesium-Thorium Alloy Compo-
Wire brush area to a firm metal subsur-
nents of T-53, T-55 and T-63 engines
contain radioactive material. The
removal shall be attempted only under
the operating procedures required by
The use of goggles or face shield
is mandatory when using motor-
b. Abrasive Blasting. Abrasive blasting (a rapid
method) consists of bombarding a surface with an