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 TB 55-1900-201-45/1
concentrations may occur, ie, in areas of sudden changes of thickness or abrupt ending of stiffeners. The surface of un-
painted laminates also shall be inspected for erosion.
2-22. Corrective Action.
a. Any damage that is detected during the inspection of the laminate will be corrected in the following manner.
(1)
Damaged steel connecting structure or supports should be repaired or replaced. Reference Section I.
(2)
Fasteners will be replaced or retightened as required.
(3) Unpainted laminations shall be coated with clear resin when surface erosion causes the pattern of the
glass reinforcement to become prominent.
(4) Painted laminates shall be repainted only when the paint peels or blisters or becomes chipped. Paint in
accordance with TB 43-0144, Painting of Vessels.
(5) Damage requiring replacement of the laminate includes delaminations or damage not extending through
the entire laminate thickness, fractures or damage requiring replacement of a small area, fractures or damage requiring
replacement of a large area, separated or broken stiffeners, repair of reinforced coatings and repair of double-skin struc-
tures.
SECTION VIII. Aluminum Hulls
2-23. Hull Deficiencies.
a. The demands for fast, lightweight boats have resulted in the use of fabricated aluminum hulls. When alumi-
num is galvanically coupled to another metal, it will sacrifice itself in a way similar to that of the zinc or magnesium an-
odes. In addition, aluminum does not have the corrosion indicators such as rust and rust streaking - inherent of steel
hulls.
b. Galvanic corrosion caused by dissimilar contact with aluminum is a problem that can occur.
c.
There are three applications which account for most galvanic corrosion situations.
(1)
Connections of aluminum deck house bulkheads to a steel bar.
(2)
The attachment of steel or brass fittings to an aluminum structure.
(3)
Dissimilar metal appendages such as rudders, propellers, etc., on an aluminum hull.
2-18
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