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===Spacebus 100 === [[File:STS-51-G Arabsat 1-B deployment.jpg|right|thumb|Deployment of Arabsat-1B from ''Discovery'']] Three Spacebus 100 satellites were produced for [[Arab Satellite Communications Organization|Arabsat]] to serve the 22 members of the [[Arab League]].<ref>[https://web.archive.org/web/20021022201125/http://www.astronautix.com/craft/spaus100.htm#chrono Spacebus 100 chronology]</ref> One of the solar panels on the first satellite, [[Arabsat-1A]], failed to deploy, resulting in reduced power. This, combined with gyroscope issues, caused it to spend most of its operational lifespan as a reserve satellite.<ref name="SSF">{{cite book|last=Harland|first=David M|author2=Lorenz, Ralph D. |title=Space Systems Failures|publisher=Springer-Praxis|location=Chichester|year=2005|edition=2006|isbn=0-387-21519-0|page=221}}</ref>
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