THRUSH S2R – G10 Maintenance Manual page 88

AIRCRAFT MAINTENANCE MANUAL
lubricants, oils, agriculture
water and/or weathering.
painted when cured.
If you haven't worked with this material
before, understand that it is a two-part
mixture that must be mixed properly,
according to the
instructions. It is available with working life
of from ½ hour to 4 hours, and you
generally want to give yourself as much
working life as possible. It also comes in
two consistencies, "A" being thin enough to
paint on, and "B" being thicker and
requiring spreading on with a tool. They
are available in bulk or in several sizes of
kits that contain the proper proportions of
the two materials
thorough mixing.
WARNING
REFER TO AND ADHERE TO
ALL MEASURES
PRECAUTIONS
FROM THE
MATERIAL SAFETY
SHEET (MSDS) PRIOR TO USING
OR REMOVING FUEL PROOF
SEALER AND
CHEMICALS, ADHESIVES, OILS,
FUELS, SEALERS, CLEANERS,
OR SOLVENTS LISTED IN THIS
MANUAL.
When needing only small amounts of
sealer, bulk material is the more cost
effective way to
manufacturer's instructions
Generally a lot more of one part is used
than the other. Use a clean, smooth, flat
non-porous surface to mix the sealer on,
about twice as big as you think you will
need. Start by measuring out the part
used in larger
approximate end amount needed. Then
Effective: 3/26/2010
THRUSH AIRCRAFT, INC – MODEL S2R G10
chemicals,
They can be
manufacturer's
and require only
AND
OBTAINED
APPLICABLE
DATA
ANY OTHER
go. Read the
thoroughly.
proportion in the
measure out the proper proportion of the
other constituent material on top of the first
one. Mix and stir both components until a
uniform gray color is achieved. There
should be no white or black streaks in the
properly blended material. Blend the
components slowly, as violent stirring will
entrap air in the cured sealant. Do not thin
the sealant with solvents.
Thoroughly clean all surfaces to which the
sealant is to be applied immediately prior
to sealant application. Cleaning should be
accomplished with clean, lint-free paper or
cloth towels or small paintbrushes soaked
with Acetone or Methyl Ethyl Ketone
(MEK) and wiped clean. Do not let the
solvent dry on the surface, but instead
wipe it off before it dries. Always clean an
area longer and wider than the width of the
finally applied sealant to ensure no
contamination.
Fuel proof sealant is also used by Thrush
Aircraft, Inc. to seal all exposed stressed
skin fillet joints and faying (face to face)
seals, fiberglass to aluminum fillets and to
seal cockpit windows. This extra sealing
prevents water and corrosive chemical
entry into these vital structures. Fuel proof
sealant is used to seal all bolts and carry-
through structure in the chemical hopper.
A one part sealant to Mil-S-4383C may be
used as a topcoat over polysulfide fuel
proof sealers inside of the integral fuel
tanks. It has the consistency of thin syrup
and can be painted on top of all previously
sealed internal fuel tank seams.
used, it must be allowed to air dry for 4
days minimum before being exposed to
fuel. Alternatively, a long curing type A
fuel proof sealer to AMS-S-8802 can be
painted on as a top coat. Either way, the
"wet wing" fuel tanks must be finished with
a topcoat over the repair and a minimum of
6" around it.
If it is
5-9
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