The practice countdown, or Terminal Countdown Demonstration Test (TCDT), is considered a key training exercise for the astronauts and for the Kennedy Space Center (KSC) launch team. The exercise gives engineers an opportunity to run through the preparations leading up to a Shuttle launch. It also serves as a launch-day dress rehearsal for the astronauts.
As part of the training at KSC the crew are familiarised with the M-113 armoured personel carrier which is used to evacuate the crew from the launch pad in the case of fire. Later in the TCDT the crew donned their orange partial-pressure suits and entered Space Shuttle Discovery for a simulation of the launch countdown.
As well as exchanging a member of the Station's permanent crew, and the challenging operation of repositioning a set of solar arrays, the STS-120 crew is responsible for the safe delivery of the Italian-built Node 2 connecting module - an important step in the continued construction of the International Space Station.
The arrival of the cylindrical Node 2 module, which will be attached to the end of US Destiny laboratory, paves the way for the addition of the European Columbus laboratory and the Japanese Kibo laboratory.
STS-120 is scheduled for launch on 23 October 2007.
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 Related articles

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| | Discovery moved to launch pad (http://www.esa.int/SPECIALS/Esperia/SEMS277H07F_0.html) |
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| | Nespoli focuses on complex mission (http://www.esa.int/esaCP/SEMUKDQ08ZE_index_0.html) |
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 Related links

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| | Paolo Nespoli (http://www.esa.int/esaHS/ESAN0VZUMOC_astronauts_0.html) |
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| | Node 2: Connecting Module (http://www.esa.int/esaHS/ESAWEL0VMOC_iss_0.html) |
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| | Italian Space Agency (ASI) (http://www.asi.it) |
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| | STS-120 (NASA) (http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts120/index.html) |
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 Downloads

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| | Esperia factsheets (pdf) (http://www.esa.int/esaHS/SEM5Q3MPQ5F_iss_0.html) |
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| | Esperia newspaper (pdf) (http://esamultimedia.esa.int/docs/esperia/newspaper/ESA_Esperia_newspaper_ENG.pdf) |
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| | Esperia gallery (http://www.esa.int/esa-mmg/mmg.pl?mission=Esperia+%28Astronaut+Nespoli%29 &keyword=+--%3E+Keyword &idf=+--%3E+ID &Ic=on &Vc=on &Ac=on &Gc=on &subm3=GO) |
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| | Esperia Mission (http://www.esa.int/SPECIALS/Esperia/index.html) |
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