Sec.  17.7   Antenna structures requiring notification to the FAA.

   A notification to the Federal Aviation Administration is required, except as
   set forth in  Sec. 17.14, for any of the following construction or alteration:

   (a) Any construction or alteration of more than 60.96 meters (200 feet) in
   height above ground level at its site.

   (b) Any construction or alteration of greater height than an imaginary
   surface extending outward and upward at one of the following slopes:

   (1) 100 to 1 for a horizontal distance of 6.10 kilometers (20,000 feet) from
   the  nearest  point of the nearest runway of each airport specified in
   paragraph  (d) of this section with at least one runway more than 0.98
   kilometers (3,200 feet) in actual length, excluding heliports.

   (2) 50 to 1 for a horizontal distance of 3.05 kilometers (10,000 feet) from
   the  nearest  point of the nearest runway of each airport specified in
   paragraph (d) of this section with its longest runway no more than 0.98
   kilometers (3,200 feet) in actual length, excluding heliports.

   (3) 25 to 1 for a horizontal distance of 1.52 kilometers (5,000 feet) from
   the nearest point of the nearest landing and takeoff area of each heliport
   specified in paragraph (d) of this section.

   (c) When requested by the FAA, any construction or alteration that would be
   in an instrument approach area (defined in the FAA standards governing
   instrument approach procedures) and available information indicates it might
   exceed an obstruction standard of the FAA.

   (d)  Any  construction  or alteration on any of the following airports
   (including heliports):

   (1) An airport that is available for public use and is listed in the Airport
   Directory of the current Airman's Information Manual or in either the Alaska
   or Pacific Airman's Guide and Chart Supplement.

   (2)  An airport under construction, that is the subject of a notice or
   proposal on file with the Federal Aviation Administration, and except for
   military  airports,  it  is clearly indicated that the airport will be
   available for public use.

   (3) An airport that is operated by an armed force of the United States.

   Note: Consideration to aeronautical facilities not in existence at the time
   of the filing of the application for radio facilities will be given only
   when proposed airport construction or improvement plans are on file with the
   Federal Aviation Administration as of the filing date of the application for
   such radio facilities.

   [ 39 FR 7581 , Feb. 27, 1974, as amended at  39 FR 26157 , July 17, 1974;  42 FR 54823 , Oct. 11, 1977;  42 FR 57127 , Nov. 1, 1977]