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MIL-T-18847C(AS)
3.7.8 Lightning strike.  There shall be no catastrophic damage due to a
stmulated  lightning  strike when tested in accordance with 4.6.23.
3.7.9 Electrostatic discharge.  The tank shell shall neither retain an
unsafe electrostatic discharge nor exceed the maximum decay rate when tested
in accordance with 4.6.22.
3.8 Finish.
3.8.1 Internal finish.  The Internal surface of the tank shall be treated
in accordance with MIL-F-7179 Type I.
3.8.2 External finish.  Neither the external coating nor the composite
surface to which it is applied shall crack, chip, or scale during the normal
service life of the tank or due to extremes of normal atmospheric conditions.
3.8.2.1 External coating.  Unless otherwise specified, external coatings
shall be in accordance with  MIL-F-7179.
3.8.3 Erosion protection.  To prevent rain erosion for Type II, the
painted tank shall be protected at the nose section with a metal cap or an
applied coating as approved by the Naval Air Systems Command. The erosion
protection coating shall be applied up to a tangent line making an angle of
15 with the center line of the tank.
3.8.4 Aerodynamic smoothness.  The external surface of the tank shall be
aerodynamically smooth and free from projections. Variation from the nominal
contour smoothness of the tank as shown on the applicable drawings shall not
exceed the dimensions shown therein when measured with a spline over the
distance of 6 inches in any direction.
3.8.4.1 Surface roughness.  Every effort shall be made to keep the
external surface of the tank as smooth as possible. When measured by a visual
comparison to a surface finish comparator, the outside surface shall be not
greater than 500 micro-inches for 50 percent of the surface area. The
remaining surface area shall be not greater than 1,000 micro-inches.
3.9 Marking identification.
Each part or assembly shall be identified in
accordance with MIL-STD-130.
3.9.1 Seals identification.  The part numbers and the manufacturer's name
and address for all replaceable elastomeric seals used in the tank shall be
noted on the tanks manufacturer's assembly drawings. The age of the seals
shall be identified on each unit in accordance with MIL-STD-1523.
3.9.2 Exterior decalcomania.  Unless otherwise specified, a decal shall be
furnished that conforms to MIL-P-38477. The decalcomania  shall be located on
the tank exterior near the aft filler unit and shall be legibly filled in with
the following information:
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