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Endeavour undocked from the Station at 1734 GMT on April 29. The weather in Florida was unhealthy on the deliberate May 1 touchdown time, so Endeavour landed in California. There was a problem with a freon cooling loop on the Orbiter, but it wasn’t fairly bad sufficient to affect the mission. On the final spacewalk, the astronauts installed the NCS (NICMOS cooling system) cryocooler in the aft shround and the related NCS radiator on the telescope’s exterior. Post-flight inspection discovered the presence of holes in the cooling traces on the nozzle of SSME 2019 (engine 3) which prompted a hydrogen leak. To further complicate matters engine three (SSME 2019) had a hydrogen leak all through the ascent, causing the engine to run hot. A loose restore pin in the engine broke free and precipitated the failure. The FSS first flew on STS 41-C (the Solar Max Repair). Bay 11: FSS (Flight Support System) – 2111 kg. Bay 11: Flight Servicing System (FSS).

Hubble Space Telescope (HST) servicing mission SM-3A, delayed repeatedly by technical problems with the shuttle fleet after the close to-disastrous previous launch. On a particularly profitable mission the area shuttle Endeavour deployed the sixty one metre lengthy STRM mast. On May 30 at 02:56 GMT Tammy Jernigan and Dan Barry entered the payload bay of Discovery from the tunnel adapter hatch, and made a 7 hr 55 min space walk, transferring tools to the exterior of the station. Tammy Jernigan and Dan Barry made a space stroll to transfer tools from the payload bay to the exterior of the station. Endeavour docked with the Station’s PMA-3 docking port at 1959 GMT on December 2. Astronauts then put in the P6 solar panel truss to the station throughout a collection of spacewalks. This was a facet-looking radar that digitally mapped with unprecedented accuracy the whole land surface of the Earth between latitudes 60 deg N and fifty four deg S. Sponsors of the flight included the US National Imagery and Mapping Company (NIMA), NASA, and the German and Italian space companies. Tom Jones and Bob Curbeam then performed three spacewalks on Februay 10 to 14 to attach the Future and PMA-2 modules to the station. Then 1700 kg of station garbage. 3300 kg of cargo from Leonardo was transferred to the Station.

The PMA-3, on Unity on the -Z nadir position, had to be moved to the port place to make room for Leonardo. The Leonardo MPLM module was lifted out of Discovery’s payload bay at 1326 GMT on August thirteen and docked to Unity’s nadir at 1554 GMT. Atlantis docked with the Station at 1651 GMT on February 9 at the PMA-3 port on Unity’s nadir. 04:31 GMT – . Discovery undocked from ISS at 22:39 GMT on June 3 right into a 385 x 399 km x 51.6 diploma orbit, leaving the station without a crew aboard. 08:35 GMT – . 10:11 GMT – . Latched on to the PDGF fixture on the Destiny ISS module at 1416 GMT. STS-102 carried the Leonardo Multi Function Logistics Module (MPLM), built by Alenia Spazio (Torino), to the International House Station. The Chandra Advanced X-ray Astrophysics Facility was one among NASA’s four Great Observatories (together with Hubble Space Telescope, Compton Gamma Ray Observatory, and the SIRTF).

This was the primary flight of Columbia since the launch of Chandra in 1999 following refurbishment. Payload: Columbia F27. Mass: 115,900 kg (255,500 lb). Payload: Discovery F29. Mass: 116,884 kg (257,685 lb). Payload: Discovery F28. Mass: 115,127 kg (253,811 lb). Discovery was taken out of service after the flight for structural inspections. Discovery undocked from the ISS at 16:08 GMT on 20 October. After rendezvous with the Zarya FGB module, on December 6 at 23:47 GMT Endeavour grappled Zarya with the robotic arm, and at 02:07 GMT on December 7 it was comfortable docked to the PMA-1 port on Unity. It was for use on the next mission to quickly place a Spacelab pallet on Destiny during installation of the Station’s robotic arm. They fired reaction management system jets in a sequence of pulses of 1.4 seconds each, over a 30-minute interval, gently elevating the station’s orbit by about 3.1 km. Three hour-long orbit elevating burns on May 24 and 25 by the RCS engines on Atlantis raised the station to a 372 x 380 km x 51.6 deg orbit.