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Forum:	Space Shuttles - Space Station
Topic:	Shuttle orbiter lifetime: 100 flights or 10 years

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<table border=0 cellpadding=0 cellspacing=0 width="600"><TR><td bgcolor="#000000"><TABLE BORDER=0 cellpadding=4 border=0 cellspacing=1 WIDTH="100%"><TR bgcolor="#660000"><TD COLSPAN=2><CENTER><FONT SIZE="2" COLOR="#ffffff" FACE="sans-serif">T O P I C     R E V I E W</font></CENTER></TD></TR><TR bgcolor="#494949"><TD valign=top><FONT SIZE="2" FACE="sans-serif">Hart Sastrowardoyo</FONT></TD><TD><FONT SIZE="2" FACE="sans-serif">Eileen Collins has been <A HREF="http://cosmiclog.msnbc.msn.com/_news/2012/04/19/11292047-astronauts-revisit-the-shuttle-debate?lite" TARGET=_blank>quoted</A> as saying that the shuttle was good for either 100 missions or 10 years.<P>I've heard the 100 missions lifetime before (and am still curious as to how they derived it — 100 missions of average seven day flight? 100 liftoffs and landings?) but this is the first I've heard of the shuttle lifetime being 10 years.<P>Obviously the person to ask is Collins, but anybody have any insight as to how either lifetime was arrived at?</FONT></TD></TR><TR bgcolor="#333333"><TD valign=top><FONT SIZE="2" FACE="sans-serif">rmacd</FONT></TD><TD><FONT SIZE="2" FACE="sans-serif">I've heard the 100 flights but never heard of the 10 years. In the 70's NASA hoped to have about 12 shuttle flights a year, that said depending on the orbiter(s) they use the 100 misisons could be achevied in or around 10 years. Although this 12 missions a year never happened due to processing times when the orbiters were on the ground </FONT></TD></TR></TABLE></td></tr></table>

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