The NIRSpec assembly integration and test status

The Near-Infrared Spectrograph (NIRSpec) is one of the four instruments on the James Webb Space Telescope (JWST) scheduled for launch in 2018. NIRSpec has been manufactured and tested by an European industrial consortium led by Airbus Defence and Space and delivered to the European Space Agency (ESA) and NASA in September 2013. Since then it has successfully been integrated onto the JWST Integrated Science Instrument Module (ISIM) and has completed ISIM Cryo-Vacuum Test#2. Since two of its most important assemblies, the Focal Plane Assembly (FPA) and the Micro-Shutter Assembly (MSA) need to be replaced by new units, we will present the status of the instrument, the status of its new flight assemblies and give an outlook on the planned exchange activities and the following instrument re-verification.