FAA-C-2621A, FEDERAL AVIATION ADMINISTRATION SPECIFICATION: DESIGN AND FABRICATION OF ANTENNA SUPPORT TOWERS (11 MAY 1977)

FAA-C-2621A, FEDERAL AVIATION ADMINISTRATION SPECIFICATION: DESIGN AND FABRICATION OF ANTENNA SUPPORT TOWERS (11 MAY 1977)., This specification sets forth requirements for the design and fabrication of self=supporting and guyed antenna support towers and the associated tower concrete foundations.