TM 5-823-4
a checkerboard pattern, then the shape of the new
(a) Size of rectangles.
The sides of the
rectangles may be modified to fit the shape of the
spherical surface.
checkerboard rectangles should measure not less than 5
feet nor more than 20 feet. However, if it is impracticable
(b) Exceptions. If the type construction of
because of the size or shape of a structure the rectangle
storage tanks does not permit coloring by a
may have sides less than 5 feet provided their
checkerboard pattern, then such obstructions should be
dimensions remain as close as practicable to the 5-foot
colored by alternate bands of orange and white, or a
minimum. When possible, corner surfaces should be
limited checkerboard pattern applied to the upper one-
colored orange. If it is technically impracticable to color
third of the structure, provided an aeronautical study
the roof of a structure in a checkerboard pattern, such
indicates that the modified marking will provide adequate
roof may be colored orange. If part or all of a spherical
protection for air navigation.
shaped structure does not permit the exact application of
LIGHTING
LIGHTING
More than 150 ft. but
More than 150 ft. but
not more than 300 ft.
not more than 300 ft.
Figure 7-2. Painting and lighting of water towers, storage tanks and similar obstructions.
7-4
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