Extra-vehicular Activity
Five back-to-back EVAs were planned for the mission. Spacewalks one through four were originally scheduled to last six hours, thirty minutes, while the fifth spacewalk was scheduled to last five hours, forty-five minutes. All five EVAs were conducted successfully, for a total time in EVA activity of thirty-six hours, fifty-six minutes.
| EVA | Spacewalkers | Start (UTC) | End (UTC) | Duration |
|---|---|---|---|---|
| EVA 1 | John M. Grunsfeld Andrew J. Feustel |
14 May 2009 12:52 |
14 May 2009 20:12 |
7 hours, 20 minutes |
| Replaced the Wide Field and Planetary Camera 2 (WFPC2) with Wide Field Camera 3 (WFC3), replaced the Science Instrument Command and Data Handling Unit, lubricated three of the shroud doors, and installed a mechanism for spacecraft to capture Hubble for de-orbit at the end of the telescope's life (Soft Capture Mechanism). | ||||
| EVA 2 | Michael J. Massimino Michael T. Good |
15 May 2009 12:49 |
15 May 2009 20:45 |
7 hours, 56 minutes |
| Removed and replaced all three of Hubble's gyroscope rate sensing units (RSUs). Removed and replaced the first of two battery unit modules. | ||||
| EVA 3 | Grunsfeld Feustel |
16 May 2009 13:35 |
16 May 2009 20:11 |
6 hours, 36 minutes |
| Removed COSTAR, stowed it for return; installed the Cosmic Origins Spectrograph in its place; removed four faulty electronics cards from the Advanced Camera for Surveys and replaced them with a new electronics box and cable. | ||||
| EVA 4 | Massimino Good |
17 May 2009 13:45 |
17 May 2009 21:47 |
8 hours, 2 minutes |
| Removed and replaced an electronics card for the Space Telescope Imaging Spectrograph (STIS). The spacewalk was extended due to problems removing a handrail as well as problems with a power tool, causing the spacewalk to end as the sixth longest EVA to that time. | ||||
| EVA 5 | Grunsfeld Feustel |
18 May 2009 12:20 |
18 May 2009 19:22 |
7 hours, 2 minutes |
| The twenty-third and final spacewalk to service Hubble, and last planned EVA from a shuttle airlock replaced the final battery module, installed Fine Guidance Sensor No. 3, removed degraded insulation panels from bays 5, 7 and 8, and installed three New Outer Blanket Layers (NOBLs) in their place, and removed and reinstalled a protective cover around Hubble's low-gain antenna. | ||||
Read more about this topic: STS-125
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