(1)
Future uses.
No material change shall be made in the use of land, and no structure or tree shall
be erected, altered, planted, or otherwise established, in any airport zones unless
a permit therefor shall have been applied for and granted. Each such application shall
indicate the purpose for which the permit is desired, with sufficient particularity
to permit it to be determined whether the resulting use, structure, or tree would
conform to the regulations herein prescribed. If such determination is in the affirmative,
the permit applied for shall be granted.
(2)
Existing uses.
Before any existing use, structure or tree may be replaced, substantially altered
or repaired, rebuilt, allowed to grow higher, or replanted, within any airport zones,
a permit must be secured authorizing such replacement, change or repair. No such permit
shall be granted that would allow the establishment or creation of an airport hazard
or permit a nonconforming use, structure, or tree to be made or become higher, or
become a greater hazard to air navigation, than it was on the effective date of this
[division] or than it is when the application for a permit is made. Except as indicated,
all applications for a permit for replacement, change or repair of existing use, structure,
or tree shall be granted.