Fig. 7. A trajectory of simulated motion of the SFU platform during electrical propulsion test. operation, each experiment will be categorized into either of these types. For an experiment which is considered to require real-time interaction by the crew, a flight operation procedure will be prepared. In either case, the ground investigators cannot play an active role in the experiment operation. Deintegration and Refurbishment After a flight, the SFU will be returned to the integration site, where the PLU boxes and instruments mounted on the top will be removed from the main structure. Prior to deintegration of the assembled platform, functional test will be conducted to verify the bus system. The main structure will be inspected for reflight as it is constructed. If necessary, elements of the structure will be replaced by new ones. The PLU boxes containing scientific instruments will be returned to each investigator for postflight check and removal of the instruments. The boxes will be refurbished for delivery to new users. 6. SEEL PRECURSOR MISSIONS Most of the experiments proposed for SEEL are characterized by the high electrical power and heavy instruments, which exceed the capacity of the SFU platform. But an element of an experiment or preliminary test of SEEL can be conducted with the SFU platform, and this is an important step toward the full-fledge test of SEEL. The high-voltage solar array experiment and electrical propulsion test are this kind of experiment. The formation flight operation of the platform propelled by an electrical propulsion and the orbiter will simulate a similar operation of the SEEL bus
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