Leak Sealing - Thrush Aircraft S2R–T660 Maintenance Manual

sealers inside of the Thrush's integral fuel tanks. It is one part (no mixing), has the consistency of
thin syrup and can be painted on top of all previously sealed internal fuel tank seams. If CS 3600 is
used, it must be allowed to air dry for 4 days minimum before being exposed to fuel. "Semkit®" pre-
measured cartridges can best be utilized by use of either a Semco® model 250 pneumatic or model
850 hand operated application gun. Thrush Aircraft Inc factory uses the following nozzles: Semco®
model Nos. 252 (2.5", 1/16" orifice), 410 (4", 1/32" orifice), or 440 (4", 1/8" orifice). The plastic
nozzle tip can be cut with a razor knife to enlarge or modify the tips orifice size and shape to control
the size and shape of the material bead.

LEAK SEALING

Determine the approximate location of the leak by visual inspection through the cover plates in the
lower surface of the wing. After leak area is determined, drain all fuel from affected tank. See
Section II for defueling procedures.
A. Remove the cover plates on upper surface of wing to repair the tank leak. Sealing can be
accomplished through these openings.
B. Clean the general area of the leak with clean paper towels. Apply an even coating of CS
3204 A2 with a stiff clean brush. Catalyst is furnished and should be carefully mixed
according to instructions on the container.
C. Allow the sealer to dry overnight.
D. After drying, the sealer should be checked for air bubbles or thin spots. Additional sealer
should be applied where necessary.
E. Reinstall the cover plates on wing upper surface.
Effective: 12/17/03
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
***WARNING***
Refer to and adhere to all measures and precautions
obtained from the applicable Material Safety Data Sheet
(MSDS) prior to using or removing CS 3204 and any other
chemicals, adhesives, materials, oils, fuels, sealers,
cleaners, or solvents listed in this manual.
Assure that the leak is not being caused by structural
cracks, loose seams or any source other than a pinhole
from around a properly installed fastener.
**CAUTION**
5 -10