| (a) The following maintenance activities do not require
an amended permit:
(1) the replacement of nuts and bolts;
(2) nailing, riveting, or welding;
(3) cleaning and painting;
(4) manipulation of the sign structure to level or
plumb it;
(5) changing of the advertising message;
(6) upgrading existing lighting for an energy efficient
lighting system; and
(7) replacing components of the structure, other than
poles, with like materials.
(b) The following are considered to be customary maintenance
activities that may be made but require an amended permit under §21.170
of this subchapter (related to Amended Permit) before the initiation
of such an activity:
(1) replacement of poles, but only if not more than
one-half of the total number of poles of the sign structure are replaced
in any 12-month period and the replacement pole is made of the same
material as the pole being replaced; and
(2) adding a catwalk that meets Occupational Safety
and Health Administration guidelines to the sign structure.
(c) An activity that is not described by subsection
(a) or (b) of this section is a substantial change that may be made
only if the sign is a conforming sign, and the license holder obtains
an amended permit before the initiation of the activity.
(d) The holder of a permit for a nonconforming sign
may apply for an amended permit to:
(1) perform eligible customary maintenance under subsection
(b) of this section; or
(2) conform the sign structure to both applicable location
and structure requirements.
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