The GEO base has overall dimensions of 1400m x 1600m with two decks of operation. The upper deck supports the crew and maintenance modules and docking facilities for transportation systems and payloads. The lower surface of the facility supports the four solar array deployment machines. Docking cranes used in berthing the modules are also attached to the base when not in use or when the GEO base is transferred to another longitudinal location. GEO base primary subsystems include electrical power (260 Kw solar array) and flight controls systems consisting of attitude control and station keeping systems, which use LO2/LH2 propulsion. Other major elements of the base include construction equipment, satellite maintenance systems, and crew modules. Construction equipment is similar to LEO base construction equipment except for docking cranes, which are not needed on the LEO base. The major maintenance systems center around microwave antenna klystron tube replacement and solar array annealing operations. Both require special equipment and provisions for access to maintenance areas and for repair/refurbishment operations. The GEO base has a construction crew size of 65 and only a minimum of construction operations so, consequently, all functions can be incorporated into a single crew module. Transportable maintenance crew modules are also based at the GEO facility. The construction crew module includes structure, electrical power, environmental control, life support, crew accommodations, and information systems. The crew modules are similar in design to the crew quarters modules used at the LEO construction base. The major modifications to the LEO modules are as follows: (1) incorporation of an operation deck in place of one of the three personnel decks since only 65 rather than 100 people are housed in the module, and (2) add an eighth deck which serves as a solar flare radiation shelter. Assuming a shielding requirement of 20 to 25 2 gm/cm , the shelter will add an additional 115,000 Kg to the basic module mass. Within the shelter will be provisions for up to five days and controls to operate the complete base on standby status. Subsystems used within the modules
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