Top Ten Facts about the James Webb Space Telescope

[kevindavis007]

http://www.youtube.com/watch?v=Ku45hQrNpPw

[kevindavis007]

I can care less about the galaxies crap.. I want it to find planets..



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[kidd]

Impressive.
100 times more powerful than Hubble.

Unfortunately, the Webb telescope will not be serviceable (as Hubble is).

[Just_Victor]

Impressive.
100 times more powerful than Hubble.

Unfortunately, the Webb telescope will not be serviceable (as Hubble is).

Without the Shuttle, Hubble is completely unserviceable.  We currently have no means of docking to or capturing it.

And truth be told, Hubble was never designed to be serviced on-orbit.  The space program, the EVA office, and Lockheed pulled off a miracle when they repaired it.

[kidd]

Without the Shuttle, Hubble is completely unserviceable.  We currently have no means of docking to or capturing it.

And truth be told, Hubble was never designed to be serviced on-orbit.  The space program, the EVA office, and Lockheed pulled off a miracle when they repaired it.

I'll agree that Hubble is presently unserviceable because we don't have an equivalent to the Space Shuttle (thanks Obama)
but the Hubble was certainly designed to be serviced in orbit. The Shuttle has been used five times to service the Hubble.

[Just_Victor]

I'll agree that Hubble is presently unserviceable because we don't have an equivalent to the Space Shuttle (thanks Obama)
but the Hubble was certainly designed to be serviced in orbit. The Shuttle has been used five times to service the Hubble.

Your agreement isn't required.

I have worked in EVA for 25 years, and Hubble does not meet any requirements for EVA serviceability.  The fasteners on the external panels are not captive.  Just review the video of the crewmembers trying to corral the screws.  The internal components are not designed for EMU glove access.  None of the internal interfaces meet any of the requirements for EVA access or work.

Lockheed designed a complete slate of specialized tools to perform the work.  That is the only reason for the Hubble EVA success.

[kidd]

Your agreement isn't required.

I have worked in EVA for 25 years, and Hubble does not meet any requirements for EVA serviceability.  The fasteners on the external panels are not captive.  Just review the video of the crewmembers trying to corral the screws.  The internal components are not designed for EMU glove access.  None of the internal interfaces meet any of the requirements for EVA access or work.

Lockheed designed a complete slate of specialized tools to perform the work.  That is the only reason for the Hubble EVA success.

My source was Wikipedia https://en.wikipedia.org/wiki/Hubble_Space_Telescope, which states "Hubble is the only telescope designed to be serviced in space by astronauts"
and
a Hubble website http://hubblesite.org/blog/2011/07/thank-you-very-much-for-the-ride/, which notes "Hubble was also designed to be serviced by shuttle astronauts, a feature that has been crucial to Hubble’s success and longevity."
and
NASA itself https://www.nasa.gov/mission_pages/hubble/story/the_story_2.html: "In regards to the maintenance and upgrading of the space telescope, plans were made to conduct servicing missions in orbit ", and " The aft shroud was modified to make instrument replacement during servicing easier."

OTOH, your experience, which is very significant, indicates that the serviceability of the Hubble may have been far less than ideal. Perhaps, in the early 1980's (which is when the Hubble was designed, and which pre-dates your experience), the concept of "serviceability" merely meant modular construction, but now means so much more.
Has the experience from the five Hubble service missions helped to establish better EVA serviceability requirements?

[Gefn]

Wow, what a telescope! I can't wait for the planets it finds.

However, is it me, or when I hear "James Webb" I think of the musician? Love his songs.

[Just_Victor]

My source was Wikipedia https://en.wikipedia.org/wiki/Hubble_Space_Telescope, which states "Hubble is the only telescope designed to be serviced in space by astronauts"
and
a Hubble website http://hubblesite.org/blog/2011/07/thank-you-very-much-for-the-ride/, which notes "Hubble was also designed to be serviced by shuttle astronauts, a feature that has been crucial to Hubble’s success and longevity."
and
NASA itself https://www.nasa.gov/mission_pages/hubble/story/the_story_2.html: "In regards to the maintenance and upgrading of the space telescope, plans were made to conduct servicing missions in orbit ", and " The aft shroud was modified to make instrument replacement during servicing easier."

OTOH, your experience, which is very significant, indicates that the serviceability of the Hubble may have been far less than ideal. Perhaps, in the early 1980's (which is when the Hubble was designed, and which pre-dates your experience), the concept of "serviceability" merely meant modular construction, but now means so much more.
Has the experience from the five Hubble service missions helped to establish better EVA serviceability requirements?

The Hubble telescope was never intended to be touched after insertion into orbit.  But the experience of designing the tools used to service Hubble definitely played into the tool design used for ISS.  We learned from servicing Hubble, but believe me, the design was never intended to be worked on EVA.  I don't care what Wikipedia says.  I worked on the tools for it, and it was a nightmare.