Sec.  17.45   Temporary warning lights.

   

   During construction of an antenna structure, for which red obstruction
   lighting is required, at least two 116- or 125-watt lamps (A21/TS)
   enclosed in aviation red obstruction light globes, shall be installed
   at the uppermost point of the structure. The intensity of each lamp
   shall not be less than 32.5 candelas. In addition, as the height of
   the structure exceeds each level at which permanent obstruction lights
   will be required, two similar lights shall be installed at each such
   level. These temporary warning lights shall be displayed nightly from
   sunset to sunrise until the permanent obstruction lights have been
   installed and placed in operation, and shall be positioned so as to
   insure unobstructed visibility of at least one of the lights at any
   normal angle of approach. If practical, the permanent obstruction
   lights may be installed and operated at each required level as
   construction progresses.

   [ 32 FR 11273 , Aug. 3, 1967, as amended at  39 FR 26157 , July 17, 1974;
    42 FR 54826 , Oct. 11, 1977]