Resealing After Complete Skin Removal; Troubleshooting - Thrush Aircraft S2R–T660 Maintenance Manual

To reseal the fuel tanks after removing or repairing the wing skin, proceed as follows:
A. Prior to installing the wing tank skin, all surfaces that will receive sealant shall be cleaned
and etched.
B. Apply CS 3204 B2 mixed compound to all areas of contact between the skin and rib
structure.
C. Rivet the wing tank skin in place and allow the sealer to dry until tacky to the touch.
D. After adequate drying, the sealer should be checked for air bubbles or thin spots. Apply
additional CS 3204 A2 sealer as necessary.
E. Reseal cover plates and fuel quantity transmitter mounting with CS 3204 B2.
F. Vacuum tank area thoroughly to remove all particles of dried sealant, dirt or other foreign
matter.
G. Allow the sealant to cure for 16 hours or more.
H. Pressure check fuel tank from 38 to 44 inches of water-manometer, for 3 (+1) minutes.
Do not attempt to apply pressure to the tank without first sealing off all lines and
vents, and without an adequate regulator to control pressure. Do not pressurize
the tank in excess of 1.589 psi (44.0 inches of water-manometer) or damage
may occur.
I. To prevent water and chemical entry into wing and empennage skin joints and edges, make
fillets by applying a small bead of CS 3204 B2 to all skin edges, joints, and overlaps. The
fillets can be painted after sealer has dried.
The trouble-shooting figure in this section discusses symptoms, which can be diagnosed and
interprets the results in terms of probable causes and the appropriate corrective remedy to be
taken. Review all probable causes given and check other listings of troubles with similar symptoms.
Items are presented in sequence, but not necessarily in order of probability.
5 -11
THRUSH AIRCRAFT INC – T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL

RESEALING AFTER COMPLETE SKIN REMOVAL

**CAUTION**

TROUBLESHOOTING

Effective: 01/10/05
R1