The expansion schedule was interrupted in 2003 by the Space Shuttle "Columbia" disaster and a resulting hiatus in flights. The Space Shuttle was grounded until 2005 with STS-114 flown by "Discovery". Assembly resumed in 2006 with the arrival of STS-115 with "Atlantis", which delivered the station's second set of solar arrays. Several more truss segments and a third set of arrays were delivered on STS-116, STS-117, and STS-118. As a result of the major expansion of the station's power-generating capabilities, more pressurised modules could be accommodated, and the "Harmony" node and "Columbus" European laboratory were added. These were soon followed by the first two components of "Kibō". In March 2009, STS-119 completed the Integrated Truss Structure with the installation of the fourth and final set of solar arrays. The final section of "Kibō" was delivered in July 2009 on STS-127, followed by the Russian "Poisk" module. The third node, "Tranquility", was delivered in February 2010 during STS-130 by the Space Shuttle "Endeavour", alongside the "Cupola", followed by the penultimate Russian module, "Rassvet", in May 2010. "Rassvet" was delivered by Space Shuttle "Atlantis" on STS-132 in exchange for the Russian Proton delivery of the US-funded "Zarya" module in 1998. The last pressurised module of the USOS, "Leonardo", was brought to the station in February 2011 on the final flight of "Discovery", STS-133. The Alpha Magnetic Spectrometer was delivered by "Endeavour" on STS-134 the same year.