Editing Space Shuttle Atlantis (section)

== Orbiter maintenance down periods ==
''Atlantis'' went through two overhauls of scheduled [[orbiter maintenance down period]]s (OMDPs) during its operational history.

''Atlantis'' arrived at [[Palmdale, California]] in October 1992 for OMDP-1. During that visit 165 modifications were made over the next 20 months. These included the installation of a drag chute, new plumbing lines to configure the orbiter for extended duration, improved nose wheel steering, more than 800 new heat tiles and blankets, new insulation for main landing gear, and structural modifications to the airframe.<ref>{{cite web|url=http://science.ksc.nasa.gov/shuttle/resources/orbiters/atlantis.html|title=Atlantis (OV-104)|publisher=NASA|date=October 10, 2009|url-status=dead|archive-url=https://web.archive.org/web/20110805020222/http://science.ksc.nasa.gov/shuttle/resources/orbiters/atlantis.html|archive-date=August 5, 2011}} {{PD-notice}}</ref>

On November 5, 1997, ''Atlantis'' again arrived at Palmdale for OMDP-2 which was completed on September 24, 1998. The 130 modifications carried out during OMDP-2 included glass cockpit displays, replacement of TACAN navigation with GPS and ISS airlock and docking installation. Several weight reduction modifications were performed on the orbiter including replacement of Advanced Flexible Reusable Surface Insulation (AFRSI) insulation blankets<ref>{{cite web|url=http://spaceflight.nasa.gov/shuttle/reference/shutref/orbiter/tps/blankets.html|title=Advanced Flexible Reusable Surface Insulation Blankets|publisher=NASA |date=October 10, 2009|access-date=October 10, 2009|archive-date=October 9, 2009|archive-url=https://web.archive.org/web/20091009075245/http://spaceflight.nasa.gov/shuttle/reference/shutref/orbiter/tps/blankets.html|url-status=dead}} {{PD-notice}}</ref> on upper surfaces with FRSI. Lightweight crew seats were installed and the [[Extended Duration Orbiter]] (EDO) package installed on OMDP-1 was removed to lighten ''Atlantis'' to better serve its prime mission of servicing the ISS.

During the standdown period post ''Columbia'' accident, ''Atlantis'' went through over 75 modifications to the orbiter ranging from very minor bolt change-outs to window change-outs and different fluid systems.<ref>{{cite web|url=http://www.nasa.gov/multimedia/podcasting/115_askmission_leinbach_transcript.html|title=Mike Leinbach, STS-115 Launch Director|publisher=NASA|date=August 22, 2006|access-date=July 25, 2010}} {{PD-notice}}</ref>

''Atlantis'' was known among the shuttle workforce as being more prone than the others in the fleet to problems that needed to be addressed while readying the vehicle for launch, leading to some nicknaming it "[[Britney Spears|Britney]]".<ref>{{cite web|url=http://www.nasaspaceflight.com/2011/06/sts-135-engineers-mfv-et-138-stringer-inspections-completed/|title=STS-135: Engineers retest MFV – ET-138 stringer inspections completed|publisher=NASASpaceFlight.com|date=June 25, 2011}}</ref>