TABLE OF KNOWNS Item Status 1. STS direct insertion Trajectory Already flown 2. Low pressure thrusters Under development by JPL and Martin Marietta 3. ACC Phase 'B* Study complete Needs launch software 4. Additional ET Add-Ons Preliminary study complete 5. Mylar Blankets Already flown Sunshade installed on Skylab 6. Tank Habitation Preliminary studies complete for Hydrogen and Oxygen Tanks 7. Tank as a hangar Preliminary work complete 8. Inflatables Preliminary work complete Flown in early 1960s 9. ET as Spacecraft Needs further study 10. ET disassembly tools Most already flown in STS as satellite repair equipment 11. Conventional Welding Experiments in space conducted Actual welding for repairs conducted on Salyut 12. Conventional Cutting Experiments in space conducted by American and Soviet
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