The movements of the antenna required to initiate installation of the RF elements are indicated in Panel B. Upon completion of the tension web installation the antenna structure is released from its hex fixture and translated in the -Y direction to the X-Y plane of the vertical section of translation track which allows the assembly to be moved in the -Z directions. The RF assembly and installation facility is then extended in the -Y direction to be in close proximity to the plane of the tension web to support installation of the RF modules onto the web. The antenna is first moved in the +Z direction until the bottom row of the tension web is accessible to the RF facility and that row of modules is then installed. The antenna is subsequently translated row-by-row past the RF facility in the -Z direction for RF module installation; when all modules have been installed the antenna-assembly is complete. Completion of the antenna occurs simultaneously with completion of the rotary joint. In Panel C the antenna is first translated in the -Z direction to the end of the verticle section of track, rotated, and then translated in the +Y direction along the lower track to the position shown which locates it over its mounting trunnions for attachment to the rotary joint. The transfer/ installation operations have been designed for minimal transfer distance of the completed antenna. The entire structure and the power conversion system (solar blankets, reflectors and power distribution system), for wing No. 1 is completed on the 34th day. Subsequent to completion of wing No. 1 the construction facility constructs the longerons and frames in the center section, installs the sliprings, constructs the trunnion supports, installs the trunnions, antenna and the power wiring in the center. Although 16 days are scheduled for this activity, the timeline requires only 12 days with two additional days scheduled for transfer of the antenna to the trunnion mounts and two days allowed for contingencies. Immediately upon completion of the center section primary structure the facilities for the operation and maintenance base are installed and the first operational maintenance crew arrives to support installation of the antenna control electronics and satellite checkout, which takes place from day 50 through day 69 as wing No. 2 is also being fabricated.
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