Sec. 17.17  Existing structures.

    (a) The requirements found in Sec. 17.23 relating to painting and 
lighting of antenna structures shall not apply to those structures 
authorized prior to July 1, 1996. Previously authorized structures may 
retain their present painting and lighting specifications, so long as 
the overall structure height or site coordinates do not change. The

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Antenna Structure Registration requirements found in Sec. 17.5, however, 
shall apply to all antenna structures that have been assigned painting 
or lighting requirements by the Commission, regardless of prior 
authorization.
    (b) No change in any of these criteria or relocation of airports 
shall at any time impose a new restriction upon any then existing or 
authorized antenna structure or structures.
[ 32 FR 11269 , Aug. 3, 1967, as amended at  61 FR 4363 , Feb. 6, 1996]

   Subpart C--Specifications for Obstruction Marking and Lighting of 
                           Antenna Structures