qn:| SUPPORT JOHNSTON ATOLL TITLE F &SNO. Air/Ground Communications Facilities 02114 STRUCTURE/FACILITY NO. TG 8.6 505, 506, 507 and 508 ($000) FUNDING AGENCY JTF -8/ RDT&E Bop SCIENTIFIC STATION NO. USER FOD PROC ENGR CONST TOTAL FURN PRE-GO Prior Cost 18.4 18.4% 18.4 18.4 CRO 3-65 TOTAL COMPLETED DESCRIPTION The Control Tower (Building 505) is an 18x 21 x 62-ft. high structure (completed prior to 1963). The tower has six floor levels as follows: a ground floor; two (2) intermediate floors; a junction room floor; an equipment room floor and a control room floor. A steel platform with guard rails is provided around the perimeter of the tower approximately 3-ft. below the control room floor. The control room is hexagonally shaped and is glazed with double paned glass set in aluminum sash. Steel pipe railing is provided around the perimeter of the roof on which is located antennas and warning lights. Metal stairs and handrails, located within the tower, provide access to all floor levels. The tower is basically a steel frame structure with concrete block walls on the lower level; exposed steel frame walls on the middle levels; corrugated asbestos cement walls from the junction room level to the steel platform; and insulated metal panel walls from the platform to the control room windows. The roof is constructed of built-up roofing. The ground floor provides space for a generator room, cable trenches and the steel stairs. Both intermediate floors contain the stairs, rest platforms and raceways for ducting. The junction room and equipment room floors provide space for equipment associated with control of aircraft. The control room provides space for traffic controllers and communications equipment. A wood frame 53-ft. high antenna tower (Building 506), measuring 20 x 20-ft. in plan, is located on the west side of Building 507. A 10-ft. high pole with crossarm is provided on top of the tower on which is mounted a tactical communications antenna. The tower was completed in 1965. The Air/Ground Tactical Communications Building (Building 507) is a 24 x 68 x 10-ft. high structure with a 13 x 34 x 10-ft. high extension located on the south side of the main structure. The building (completed prior to 1963) is constructed of concrete block walls with a concrete floor and corrugated asbestos cement roof. 2-105 VOL I