SkyLab 5
Planned for April 1974 and using the last of the left over Apollo hardware this 20 day scientific mission to the station would have also boosted it to a higher orbit. However it was decided that this cheap mission would eat into shuttle funding and so the hardware was given to museums after the ASTPÂ mission and the reboost of Skylab was left to the shuttle.
The Shuttle development fell behind schedule, the reboost was never flown and Skylab crashed back to earth early on July 11 1979. A $2 billion asset of a size that could never be replaced due to the lack of saturn V was lost.
This, one of NASA - The Forgotten Missions, allows you to rewrite history.
Requires Skylab1973 2.1, AMSOÂ and Velcro and whatever these add-ons need.
Enjoy
rossco