Thrush Aircraft S2R-T660, Maintenance Manual

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THRUSH AIRCRAFT INC – T660 TURBO THRUSH
5 -9
Effective: 01/10/05
AIRCRAFT MAINTENANCE MANUAL
FUEL LINE MAINTENANCE
CS 3204 A2 may be used as a thread lubricant or to seal minor connection leaks throughout the
fuel system. Apply sparingly to male fittings only. Always insure that a sealing compound or residue
from a previously used compound, or any other foreign matter does not enter the fuel system.
** CAUTION **
Protect all drain openings and fuel outlet screens when
applying sealant.
Any repair that breaks the fuel tank seal will necessitate resealing of that area of the tank. Repair
parts that need sealing must be installed and riveted during the sealing operation.
SEALING COMPOUNDS
CS 3204 A2 or B2 meets AMS-S-8802 (formerly Mil-S-8802) standards. It is a fuel resistant sealant
use on integral “wet wing” fuel tanks as well as other areas subject to contact with aircraft fuels,
lubricants, oils, agriculture chemicals, water and/or weathering. Thrush Aircraft Inc uses two
grades; CS 3204 A2 which is thin, brushable, and self leveling liquid and CS 3204 B2 which is a
thixotropic paste that will not flow or sag on overhead or vertical surfaces. Thrush Aircraft Inc
recommends the use of “Semkit®,” which are easy-to-use pre-measured 6 oz. Plastic tubes with a
4.5 oz. Fill of product. When mixing materials packaged in bulk or when only a small quantity is
required, stir 10 parts by weight of the part “B” component into 100 parts by weight of the part “A”
component. 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 CS 3204 with solvents. Thoroughly clean all
surfaces to which CS 3204 is to be applied immediately prior to sealant application. Cleaning shall
be accomplished with clean lint-free paper or cloth towels or small paintbrushes soaked with
Acetone or Methyl Ethyl Ketone and wiped clean. Always clean an area longer and wider than the
width of the finally applied sealant to insure maximum bonding. CS 3204 is also used to make and
seal all exposed stressed skin joints and overlap fillets, fiberglass to aluminum overlap fillets and
seal cockpit windows to prevent water and agriculture chemical entry into these vital structures. CS
3204 is used to seal all bolts in hold-down and carry-through duty in the chemical hopper. CS 3204
can be painted when cured. Alternate sealers for CS 3204 class A & B are PR-1422 class A & B
and PR-1750 class A & B. For fast set up times (20 minutes application life and cure time) “Quick
Set” CS-3204 B1/4 or PR-1435 may be used as a alternate sealer anywhere on the aircraft. CS
3600 (Mil-S-4383C) is used by Thrush Aircraft Inc as a topcoat for all the above listed polysulfide
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