Hubble Gyroscope Repair
Grunsfeld helps restore Hubble's pointing system by replacing failed gyroscope assemblies during the first Servicing Mission 3A spacewalk.
Historical biography archive · Updated 2026-11-03
John Grunsfeld Biography and Timeline
Follow John Grunsfeld through 7 dated historical records for United States of America.
John Grunsfeld, historical timeline
A chronological timeline drawn from matching World History Database records.
7Distinct records
1 of 1Page
1999–2009Years on this page
1999
Hubble Transmitter Replaced
Grunsfeld helps install a replacement transmitter for sending Hubble scientific data to the ground.
2002
Hubble Power Control Unit Replaced
Grunsfeld helps install a new Power Control Unit after Hubble is completely powered down for the first time in orbit.
2009
Hubble Data Handling System Replaced
Grunsfeld helps install a replacement Science Instrument Command and Data Handling system during the first final-servicing spacewalk.
Wide Field Camera 3 Installed
Grunsfeld helps replace WFPC2 with Wide Field Camera 3, greatly expanding Hubble's ultraviolet, visible and infrared imaging capability.
Cosmic Origins Spectrograph Installed
Grunsfeld helps install the Cosmic Origins Spectrograph, a highly sensitive ultraviolet instrument designed for Hubble.
Hubble Fine Guidance Sensor Refurbished
Grunsfeld helps install a refurbished Fine Guidance Sensor to maintain Hubble's precision pointing capability.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.