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    Mission HST-3B Servicing Mission


    STS-109 Extravehicular Activity

  • Spacewalk Number One, Flight Day Four: Replace -V2 Solar Array and Diode Box Assembly, Install Diode Box Controller Cross Strap Harness

  • Spacewalk Number Two, Flight Day Five: Replace +V2 Solar Array and Diode Box Assembly and Reaction Wheel Assembly-1

  • Spacewalk Number Three, Flight Day Six: Replace Power Control Unit (PCU)

  • Spacewalk Number Four, Flight Day Seven: Replace Faint Object Camera with the Advanced Camera for Surveys, Install Electronics Support Module and Perform Power Control Unit Cleanup Tasks

  • Spacewalk Number Five, Flight Day Eight: Install the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) Cryogenic Cooler and NICMOS Cooling System Radiator

  • EVA Timeline

  • Mission Description:

    The Third Planned HST servicing mission, (part B) will see a new science instrument: the Advanced Camera for Surveys (ACS) installed in the HST. In addition, Four large flexible solar array (SA) panels (wings) will be installed replacing the older panels so as to provide power to the observatory. Several other activities such as NICMOS Cryocooler (NCC) Installation and Power Control Unit (PCU) replacement, are planned over 5 Extra Vehicular Activity (EVA) days.

    STS-109 News

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