JWST is not intended to be serviced in space. A crewed mission to repair or upgrade the observatory, as was done for Hubble, would not currently be possible,
[51] and according to NASA Associate Administrator
Thomas Zurbuchen, despite best efforts, an uncrewed remote mission was found to be beyond current technology at the time JWST was designed.
[52] During the long JWST testing period, NASA officials referred to the idea of a servicing mission, but no plans were announced.
[53][54] Since the successful launch, NASA have stated that limited accommodation was made to facilitate future servicing missions, if any. This included: precise guidance markers in the form of crosses on the surface of JWST, for use by remote servicing missions, as well as refillable fuel tanks, removable heat protectors, and accessible attachment points.