=================================
CBS NEWS STS-126 STATUS REPORT: 64
Posted: 2:20 PM, 11/24/08
By William Harwood
CBS News Space Analyst
Changes and additions:
SR-61 (11/24/08): Astronauts gear up for final spacewalk; urine processor troubleshooting continues
SR-62 (11/24/08): Shuttle mission extended one day
SR-63 (11/24/08): Spacewalk begins
SR-64 (11/24/08): Inspection of port SARJ shows signs of wear on bearing race
=================================
2:20 PM, 11/24/08, Update: Inspection of port SARJ shows signs of wear on bearing race
Astronauts inspecting the space station's left-side solar alpha rotary joint, or SARJ, prior to lubrication intended as preventive maintenance, reported seeing signs of wear on a bearing race that appears similar to, though not nearly as extensive as, damage to the right-side SARJ.
The astronauts spent most of the first three spacewalks of Endeavour's mission cleaning and lubricating the starboard SARJ's three bearing races and installing new trundle bearing assemblies to reduce friction and fatigue-inducing vibration. One bearing race, called the outer canted surface, was heavily damaged by pressure-loaded rollers in the bearing assemblies because of a lubrication failure.
The port SARJ has been operating normally and Kimbrough plans to spend most of today's spacewalk applying lubrication as preventive maintenance. But during an inspection before the work began, Bowen reported seeing signs of wear on the port SARJ's outer canted surface.
"If you look at the outer canted surface, you can see two dark lines, one above and one below the track where the trundle bearings are riding, it looks at though there is some wear where the trundle bearings are riding," Bowen said. "You can see ... a little wear pattern in there that's sort of a junior version of what we have on the other side."
The SARJ mechanisms are critical to space station power generation, rotating outboard solar panels to keep them face-on to the sun as the lab orbits the Earth. The damaged right-side SARJ can no longer operate in auto-track mode, but engineers hope the cleaning, lubrication and bearing replacement carried out during Endeavour's mission will permit occasional sun-tracking to improve power output.
The port SARJ has been operating normally, although Bowen's report today would seem to indicate the planned lubrication could be of more immediate benefit than initially thought.
=================================
Quick-Launch Web Links:
CBS News STS-126 Status Reports:
http://www.cbsnews.com/network/news/space/current.html
CBS News STS-126 Quick-Look Page:
http://www.cbsnews.com/network/news/space/currentglance.html
NASA ISS Expeditions Page:
http://www.nasa.gov/mission_pages/station/expeditions/index.html
NASA Shuttle Web: http://spaceflight.nasa.gov/shuttle/index.html
NASA Station Web: http://spaceflight.nasa.gov/station/index.html
Spaceflight Now: http://spaceflightnow.com/index.html
GoogleSatTrack: http://www.lizard-tail.com/isana/tracking/
=================================
Monday, November 24, 2008
230p 11/24 Update: 'Wear' seen on port SARJ bearing race
Subscribe to:
Post Comments (Atom)
Carousel
MP3 Clips
Popular Posts
-
New Articles on The Daily Dust today Attic Lights To Sing The Theme Tune… Posted: 09 Jan 2009 04:25 AM CST Could the ne...
-
New Articles on The Daily Dust today Playing Tetris Is Good For You, Can Also Treat Stress Posted: 10 Jan 2009 08:52 AM C...
-
New Articles on The Daily Dust today Interest Rates Down to 1.5% Posted: 08 Jan 2009 07:22 AM CST UK Interest Rates At ...
-
You are receiving this message as a subscriber to the FDA HIV/AIDS electronic list serve. The purpose of the list serve is to relay importan...
-
Tell a Friend About GX Go on a Reality Tour Reality Tours eNewsletter CONTRIBUTE TO GLOBAL EXCHANGE Dear Friends, Global Exch...
No comments:
Post a Comment