-
#160
by
Ford Mustang
on 18 Feb, 2008 21:34
-
And not to take away from the current RCS issue, going to post some inspection stuff from this morning, which nobody posted about:
EDIT: And as I post, the highlights go off. Oh well, more next hour! :laugh:
-
#161
by
psloss
on 18 Feb, 2008 21:40
-
-
#162
by
Ford Mustang
on 18 Feb, 2008 21:41
-
Currently in MCC-H, handover between Orbit 2 team to the "Planning" Team. Atlantis' sleep period officially happened just under an hour ago.
-
#163
by
psloss
on 18 Feb, 2008 21:43
-
PAO just noting "no joy" on the switch cycle they did on the aft 5 heaters.
-
#164
by
Ford Mustang
on 18 Feb, 2008 21:43
-
PAO just said there was no joy in recovering the heater (that they flipped off and on). Still well above danger temperatures.
-
#165
by
astrobrian
on 18 Feb, 2008 22:03
-
Any idea what the redish things are up by Canada on the long range tracks?
-
#166
by
Jim
on 18 Feb, 2008 22:05
-
astrobrian - 18/2/2008 6:03 PM
Any idea what the redish things are up by Canada on the long range tracks?
where? Can you post an example?
-
#167
by
mkirk
on 18 Feb, 2008 22:07
-
DaveS - 18/2/2008 4:10 PM
collectSPACE - 18/2/2008 11:06 PM
Just about 20 minutes before Atlantis' crew was preparing to go to sleep, capcom Stephen Robinson called up to the orbiter indicating that a heater for one of their aft vernier RCS thrusters had failed and warned that an alarm might sound as a result.
That call was soon followed by a second warning, this time that multiple heaters had failed. After a brief (routine) comm outage, Robinson asked commander Steve Frick to cycle the switch that enables the heaters, so that the ground could watch if the system warmed while the crew sleeps.
So they're losing multiple aft VRCS heaters? Doesn't that automatically deselect those jets and making the, "NO-GO" for firing? This happened for jet L5L prior to launch of STS-121 in July 2006.
The jets can still be used.
The real issue with failed heaters would be the injector temperatures or propellant line/manifold temperatures - depending on which heaters have failed - the Mission Control Center can monitor these temps. Lack of heaters and infrequent firing can possibly allow the temps to go out of limits.
Maneuvering the orbiter to a more thermally friendly attitude or intentionally firing the jets for small durations to warm them up are some of the options available.
Bottom line is this is not a major concern at this point.
Mark Kirkman
-
#168
by
astrobrian
on 18 Feb, 2008 22:09
-
-
#169
by
Ford Mustang
on 18 Feb, 2008 22:11
-
Great handheld shot of Columbus!!
-
#170
by
Ford Mustang
on 18 Feb, 2008 22:31
-
Replays of Late Inspection:
-
#171
by
Ford Mustang
on 18 Feb, 2008 22:33
-
Hmm, that was it. I'm not gonna try anymore, only about 5 minutes worth of Late Inspection footage.
-
#172
by
erioladastra
on 18 Feb, 2008 23:28
-
"Was this indeed "debris" that is pictured here? I received an e-mail from a friend who had recorded NASA TV during this same time frame and he reported having seen what appeared to be debris passing the ISS. I would sure appreciate someone commenting about this photo if they had a moment. Thank you."
We havent analyzed yet but likely and not unusual.
-
#173
by
nsf-rt
on 19 Feb, 2008 00:20
-
Some screenshots showing the shuttle from the ISS during the flyaround.
-
#174
by
shaula1247
on 19 Feb, 2008 01:22
-
Jorge - 19/2/2008 1:37 AM
shaula1247 - 18/2/2008 4:01 AM
Interesting that flyaround is at 470 feet (at the moment) I recollect that this is usually at 600 feet, the annular track on the graphic also indicates that this is inside the usual range.
The crew can start the flyaround at any range over 400 ft on the +Vbar (in front of ISS/on the left of the graphic). They allow a small opening rate to continue so that they hit 600 ft around the time of arrival on the -Rbar (above ISS, on the top of the graphic). Once at 600 ft they remain between 600-700 ft for the remainder of the flyaround.
Thanks. I couldnīt find pictures of earlier tracks to compare.
-
#175
by
Jorge
on 19 Feb, 2008 01:53
-
shaula1247 - 18/2/2008 8:22 PM
Jorge - 19/2/2008 1:37 AM
shaula1247 - 18/2/2008 4:01 AM
Interesting that flyaround is at 470 feet (at the moment) I recollect that this is usually at 600 feet, the annular track on the graphic also indicates that this is inside the usual range.
The crew can start the flyaround at any range over 400 ft on the +Vbar (in front of ISS/on the left of the graphic). They allow a small opening rate to continue so that they hit 600 ft around the time of arrival on the -Rbar (above ISS, on the top of the graphic). Once at 600 ft they remain between 600-700 ft for the remainder of the flyaround.
Thanks. I couldnīt find pictures of earlier tracks to compare.
There are relative motion plots in Section 1 of the Rendezvous FDF, which NASA has made available here:
http://www.nasa.gov/centers/johnson/news/flightdatafiles/foia_archive.htmlThe undocking/flyaround plot is the last one in Section 1. The 600-700 ft flyaround started with STS-115; the longer range is required to reduce RCS plume impingement on solar arrays outboard of the alpha joints. Previous flights used a 400-500 ft flyaround range.
-
#176
by
ckiki lwai
on 19 Feb, 2008 07:14
-
